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254 vulnerabilities found for xen by Xen
CERTFR-2026-AVI-0942
Vulnerability from certfr_avis
De multiples vulnérabilités ont été découvertes dans Xen. Certaines d'entre elles permettent à un attaquant de provoquer une élévation de privilèges, un déni de service à distance et une atteinte à la confidentialité des données.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
References
| Title | Publication Time | Tags | |||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Xen toutes versions sans le dernier correctif de s\u00e9curit\u00e9",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-62429",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62429"
},
{
"name": "CVE-2026-62423",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62423"
},
{
"name": "CVE-2026-42492",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42492"
},
{
"name": "CVE-2026-42495",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42495"
},
{
"name": "CVE-2026-62427",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62427"
},
{
"name": "CVE-2026-62424",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62424"
},
{
"name": "CVE-2026-62426",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62426"
},
{
"name": "CVE-2026-62428",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62428"
},
{
"name": "CVE-2026-62436",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62436"
},
{
"name": "CVE-2026-42493",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42493"
},
{
"name": "CVE-2026-62434",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62434"
},
{
"name": "CVE-2026-62433",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62433"
},
{
"name": "CVE-2026-62432",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62432"
},
{
"name": "CVE-2026-62430",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62430"
},
{
"name": "CVE-2026-42494",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42494"
},
{
"name": "CVE-2026-62435",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62435"
},
{
"name": "CVE-2026-62431",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62431"
},
{
"name": "CVE-2026-62425",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-62425"
}
],
"initial_release_date": "2026-07-29T00:00:00",
"last_revision_date": "2026-07-29T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0942",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-07-29T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
},
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Xen. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges, un d\u00e9ni de service \u00e0 distance et une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Xen",
"vendor_advisories": [
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-495",
"url": "https://xenbits.xen.org/xsa/advisory-495.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-501",
"url": "https://xenbits.xen.org/xsa/advisory-501.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-504",
"url": "https://xenbits.xen.org/xsa/advisory-504.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-500",
"url": "https://xenbits.xen.org/xsa/advisory-500.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-499",
"url": "https://xenbits.xen.org/xsa/advisory-499.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-508",
"url": "https://xenbits.xen.org/xsa/advisory-508.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-496",
"url": "https://xenbits.xen.org/xsa/advisory-496.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-506",
"url": "https://xenbits.xen.org/xsa/advisory-506.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-507",
"url": "https://xenbits.xen.org/xsa/advisory-507.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-503",
"url": "https://xenbits.xen.org/xsa/advisory-503.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-505",
"url": "https://xenbits.xen.org/xsa/advisory-505.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-502",
"url": "https://xenbits.xen.org/xsa/advisory-502.html"
},
{
"published_at": "2026-07-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-497",
"url": "https://xenbits.xen.org/xsa/advisory-497.html"
}
]
}
CERTFR-2026-AVI-0721
Vulnerability from certfr_avis
De multiples vulnérabilités ont été découvertes dans Xen. Elles permettent à un attaquant de provoquer une élévation de privilèges, un déni de service à distance et une atteinte à la confidentialité des données.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
References
| Title | Publication Time | Tags | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Xen toutes versions sans le dernier correctif de s\u00e9curit\u00e9",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-42489",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42489"
},
{
"name": "CVE-2026-42487",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42487"
},
{
"name": "CVE-2025-10263",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-10263"
},
{
"name": "CVE-2026-42488",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42488"
},
{
"name": "CVE-2026-42490",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42490"
}
],
"initial_release_date": "2026-06-10T00:00:00",
"last_revision_date": "2026-06-10T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0721",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-06-10T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
},
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Xen. Elles permettent \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges, un d\u00e9ni de service \u00e0 distance et une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Xen",
"vendor_advisories": [
{
"published_at": "2026-06-09",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-491",
"url": "https://xenbits.xen.org/xsa/advisory-491.html"
},
{
"published_at": "2026-06-09",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-493",
"url": "https://xenbits.xen.org/xsa/advisory-493.html"
},
{
"published_at": "2026-06-09",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-494",
"url": "https://xenbits.xen.org/xsa/advisory-494.html"
},
{
"published_at": "2026-06-09",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-492",
"url": "https://xenbits.xen.org/xsa/advisory-492.html"
}
]
}
CERTFR-2026-AVI-0579
Vulnerability from certfr_avis
Une vulnérabilité a été découverte dans Xen. Elle permet à un attaquant de provoquer une élévation de privilèges.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| XEN | Xen | Xen versions 4.21.x sans le correctif de sécurité xsa490-4.21.patch | ||
| XEN | Xen | Xen versions 4.17.x sans le correctif de sécurité xsa490-4.17-1.patch ou xsa490-4.17-2.patch | ||
| XEN | Xen | Xen versions 4.18.x sans le correctif de sécurité xsa490-4.21.patch | ||
| XEN | Xen | Xen versions xen-unstable sans le correctif de sécurité xsa490.patch |
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Xen versions 4.21.x sans le correctif de s\u00e9curit\u00e9 xsa490-4.21.patch",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen versions 4.17.x sans le correctif de s\u00e9curit\u00e9 xsa490-4.17-1.patch ou xsa490-4.17-2.patch",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen versions 4.18.x sans le correctif de s\u00e9curit\u00e9 xsa490-4.21.patch",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen versions xen-unstable sans le correctif de s\u00e9curit\u00e9 xsa490.patch ",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2025-54518",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-54518"
}
],
"initial_release_date": "2026-05-13T00:00:00",
"last_revision_date": "2026-05-13T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0579",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-05-13T00:00:00.000000"
}
],
"risks": [
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
}
],
"summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans Xen. Elle permet \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges.",
"title": "Vuln\u00e9rabilit\u00e9 dans Xen",
"vendor_advisories": [
{
"published_at": "2026-05-12",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-490",
"url": "https://xenbits.xen.org/xsa/advisory-490.html"
}
]
}
CERTFR-2026-AVI-0509
Vulnerability from certfr_avis
De multiples vulnérabilités ont été découvertes dans Xen. Certaines d'entre elles permettent à un attaquant de provoquer une élévation de privilèges, un déni de service à distance et une atteinte à la confidentialité des données.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| XEN | Xen | Xen toutes versions utilisant XAPI sans les derniers correctifs de sécurité | ||
| XEN | Xen | Xen toutes versions incluant le correctif de sécurité XSA-419 sans le correctif xsa483-xapi.patch pour Xen XAPI oxenstored | ||
| XEN | Xen | Xen sur systèmes x86 ou Arm PVH ou HVM avec un noyau linux postérieur à 3.8 sans le correctif de sécurité xsa487-linux.patch | ||
| XEN | Xen | Xen toutes versions incluant le correctif de sécurité XSA-419 sans le correctif xsa483.patch pour Xen 4.18.x | ||
| XEN | Xen | Xen versions postérieures ou égales à 4.2 sans le correctif de sécurité xsa484.patch applicable pour Xen 4.18.x | ||
| XEN | Xen | Xen versions 4.17.x et 4.18.x sans le correctif de sécurité xsa486-4.18.patch | ||
| XEN | Xen | Xen versions postérieures ou égales à 4.2 sans le correctif de sécurité xsa484-4.17.patch applicable pour Xen 4.17.x | ||
| XEN | Xen | Xen avec un noyau linux postérieur à 4.12 sans le correctif de sécurité xsa485-linux.patch | ||
| XEN | Xen | Xen versions 4.19.x sans le correctif de sécurité xsa486.patch | ||
| XEN | Xen | Xen toutes versions incluant le correctif de sécurité XSA-419 sans le correctif xsa483-4.17.patch pour Xen 4.17.x |
References
| Title | Publication Time | Tags | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Xen toutes versions utilisant XAPI sans les derniers correctifs de s\u00e9curit\u00e9",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen toutes versions incluant le correctif de s\u00e9curit\u00e9 XSA-419 sans le correctif xsa483-xapi.patch pour Xen XAPI oxenstored",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen sur syst\u00e8mes x86 ou Arm PVH ou HVM avec un noyau linux post\u00e9rieur \u00e0 3.8 sans le correctif de s\u00e9curit\u00e9 xsa487-linux.patch",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen toutes versions incluant le correctif de s\u00e9curit\u00e9 XSA-419 sans le correctif xsa483.patch pour Xen 4.18.x",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen versions post\u00e9rieures ou \u00e9gales \u00e0 4.2 sans le correctif de s\u00e9curit\u00e9 xsa484.patch applicable pour Xen 4.18.x",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen versions 4.17.x et 4.18.x sans le correctif de s\u00e9curit\u00e9 xsa486-4.18.patch",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen versions post\u00e9rieures ou \u00e9gales \u00e0 4.2 sans le correctif de s\u00e9curit\u00e9 xsa484-4.17.patch applicable pour Xen 4.17.x",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen avec un noyau linux post\u00e9rieur \u00e0 4.12 sans le correctif de s\u00e9curit\u00e9 xsa485-linux.patch ",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen versions 4.19.x sans le correctif de s\u00e9curit\u00e9 xsa486.patch ",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen toutes versions incluant le correctif de s\u00e9curit\u00e9 XSA-419 sans le correctif xsa483-4.17.patch pour Xen 4.17.x",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-31787",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-31787"
},
{
"name": "CVE-2026-23559",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23559"
},
{
"name": "CVE-2026-42486",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42486"
},
{
"name": "CVE-2026-23558",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23558"
},
{
"name": "CVE-2026-23556",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23556"
},
{
"name": "CVE-2026-31786",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-31786"
},
{
"name": "CVE-2026-23561",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23561"
},
{
"name": "CVE-2026-23557",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23557"
},
{
"name": "CVE-2026-23560",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23560"
},
{
"name": "CVE-2026-23562",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23562"
}
],
"initial_release_date": "2026-04-29T00:00:00",
"last_revision_date": "2026-04-29T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0509",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-04-29T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
},
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Xen. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges, un d\u00e9ni de service \u00e0 distance et une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Xen",
"vendor_advisories": [
{
"published_at": "2026-04-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-484",
"url": "https://xenbits.xen.org/xsa/advisory-484.html"
},
{
"published_at": "2026-04-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-489",
"url": "https://xenbits.xen.org/xsa/advisory-489.html"
},
{
"published_at": "2026-04-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-485",
"url": "https://xenbits.xen.org/xsa/advisory-485.html"
},
{
"published_at": "2026-04-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-486",
"url": "https://xenbits.xen.org/xsa/advisory-486.html"
},
{
"published_at": "2026-04-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-487",
"url": "https://xenbits.xen.org/xsa/advisory-487.html"
},
{
"published_at": "2026-04-28",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-483",
"url": "https://xenbits.xen.org/xsa/advisory-483.html"
}
]
}
CERTFR-2026-AVI-0460
Vulnerability from certfr_avis
Une vulnérabilité a été découverte dans Xen. Elle permet à un attaquant de provoquer une atteinte à la confidentialité des données.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| XEN | Xen | Xen versions 4.19.x et 4.20.x sans le correctif de sécurité xsa488-4.20.patch | ||
| XEN | Xen | Xen versions 4.18.x avec le correctif de sécurité xsa488-4.18.patch | ||
| XEN | Xen | Xen versions xen-unstable et 4.21.x sans le correctif de sécurité xsa488.patch | ||
| XEN | Xen | Xen versions 4.17.x avec le correctif de sécurité xsa488-4.17.patch |
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Xen versions 4.19.x et 4.20.x sans le correctif de s\u00e9curit\u00e9 xsa488-4.20.patch",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen versions 4.18.x avec le correctif de s\u00e9curit\u00e9 xsa488-4.18.patch",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen versions xen-unstable et 4.21.x sans le correctif de s\u00e9curit\u00e9 xsa488.patch",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
},
{
"description": "Xen versions 4.17.x avec le correctif de s\u00e9curit\u00e9 xsa488-4.17.patch",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2025-54505",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-54505"
}
],
"initial_release_date": "2026-04-20T00:00:00",
"last_revision_date": "2026-04-20T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0460",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-04-20T00:00:00.000000"
}
],
"risks": [
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
}
],
"summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans Xen. Elle permet \u00e0 un attaquant de provoquer une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es.",
"title": "Vuln\u00e9rabilit\u00e9 dans Xen",
"vendor_advisories": [
{
"published_at": "2026-04-17",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-488",
"url": "https://xenbits.xen.org/xsa/advisory-488.html"
}
]
}
CERTFR-2026-AVI-0347
Vulnerability from certfr_avis
Une vulnérabilité a été découverte dans Xen. Elle permet à un attaquant de provoquer un contournement de la politique de sécurité.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Xen sur Linux sans les correctifs de s\u00e9curit\u00e9 xsa482-linux-1.patch et xsa482-linux-2.patch",
"product": {
"name": "Xen",
"vendor": {
"name": "XEN",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-31788",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-31788"
}
],
"initial_release_date": "2026-03-24T00:00:00",
"last_revision_date": "2026-03-24T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0347",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-03-24T00:00:00.000000"
}
],
"risks": [
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
}
],
"summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans Xen. Elle permet \u00e0 un attaquant de provoquer un contournement de la politique de s\u00e9curit\u00e9.",
"title": "Vuln\u00e9rabilit\u00e9 dans Xen",
"vendor_advisories": [
{
"published_at": "2026-03-24",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-482",
"url": "https://xenbits.xen.org/xsa/advisory-482.html"
}
]
}
CVE-2026-62434 (GCVE-0-2026-62434)
Vulnerability from cvelistv5
Published
2026-07-28 12:33
Modified
2026-07-28 16:33
Severity ?
VLAI Severity ?
EPSS score ?
Summary
A guest started with Populated on Demand enabled (PoD) can attempt to
reclaim pages which aren't regular guest RAM. This can cause corruption
of memory management state in Xen.
References
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-07-28T16:33:34.668Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://xenbits.xen.org/xsa/advisory-507.html"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/07/28/23"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62434",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T14:59:52.970334Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-787",
"description": "CWE-787 Out-of-bounds Write",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:00:00.728Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-507"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from 3.4 onwards are vulnerable. Xen versions 3.3 and\nearlier are not vulnerable.\n\nOnly x86 systems are vulnerable.\n\nOnly x86 HVM and PVH guests started in populate-on-demand mode are\nbelieved to be able to leverage the vulnerability. Populate-on-demand\nmode is activated when the guest\u0027s xl configuration file specifies a\n\"maxmem\" value which is larger than the \"memory\" value."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "A guest started with Populated on Demand enabled (PoD) can attempt to\nreclaim pages which aren\u0027t regular guest RAM. This can cause corruption\nof memory management state in Xen."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A buggy or malicious guest can cause corruption of Xen\u0027s state, leading\nto crashes or other malfunctions. Information leak and privilege\nescalation cannot be ruled out."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:33:08.540Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-507.html"
}
],
"title": "PoD: Don\u0027t try to reclaim special pages",
"workarounds": [
{
"lang": "en",
"value": "Running only PV guests or HVM/PVH guests without PoD will avoid the\nvulnerability."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62434",
"datePublished": "2026-07-28T12:33:08.540Z",
"dateReserved": "2026-07-14T10:28:12.655Z",
"dateUpdated": "2026-07-28T16:33:34.668Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62433 (GCVE-0-2026-62433)
Vulnerability from cvelistv5
Published
2026-07-28 12:32
Modified
2026-07-28 16:33
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Parts of the DM_OP handling code assumes the caller has provided the
required number of buffers for the given operation without any checking
being done. As a result, certain operations might access stack
rubble as structures are possibly uninitialized.
References
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-07-28T16:33:33.573Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://xenbits.xen.org/xsa/advisory-506.html"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/07/28/22"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62433",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:03:57.527525Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-665",
"description": "CWE-665 Improper Initialization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:06:29.391Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-506"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from 4.10 onwards are vulnerable. Xen versions 4.9 and\nearlier are not vulnerable.\n\nOnly entities controlling HVM guests can leverage the vulnerability.\nThese are device models running in either a stub domain or de-privileged\nin Dom0."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Parts of the DM_OP handling code assumes the caller has provided the\nrequired number of buffers for the given operation without any checking\nbeing done. As a result, certain operations might access stack\nrubble as structures are possibly uninitialized."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A device model of a HVM guest can gain insight on the contents of the\nXen stack, thus possibly leaking data from other guests contexts."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:32:59.802Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-506.html"
}
],
"title": "correct buffer checks for DM_OP hypercalls",
"workarounds": [
{
"lang": "en",
"value": "Running only PV or PVH guests will avoid the vulnerability.\n\n(Switching from a device model stub domain or a de-privileged device\nmodel to a fully privileged Dom0 device model does NOT mitigate this\nvulnerability. Rather, it simply recategorises the vulnerability to\nhostile management code, regarding it \"as designed\"; thus it merely\nreclassifies these issues as \"not a bug\". The security of a Xen system\nusing stub domains is still better than with a qemu-dm running as a Dom0\nprocess. Users and vendors of stub qemu dm systems should not change\ntheir configuration to use a Dom0 QEMU process.)"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62433",
"datePublished": "2026-07-28T12:32:59.802Z",
"dateReserved": "2026-07-14T10:28:12.655Z",
"dateUpdated": "2026-07-28T16:33:33.573Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62432 (GCVE-0-2026-62432)
Vulnerability from cvelistv5
Published
2026-07-28 12:32
Modified
2026-07-28 16:33
Severity ?
VLAI Severity ?
EPSS score ?
Summary
The EVTCHNOP_expand_array hypercall checks for whether FIFO event
channels are enabled, but without holding the correct lock. It can race
with EVTCHNOP_reset, resulting in dereferencing a NULL pointer.
References
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-07-28T16:33:32.509Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://xenbits.xen.org/xsa/advisory-505.html"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/07/28/21"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62432",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:13:34.638706Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-362",
"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:13:39.575Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-505"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and\nearlier are not vulnerable."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "The EVTCHNOP_expand_array hypercall checks for whether FIFO event\nchannels are enabled, but without holding the correct lock. It can race\nwith EVTCHNOP_reset, resulting in dereferencing a NULL pointer."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A malicious HVM guest (x86 HVM or PVH, and ARM) can crash Xen leading to\na denial of service.\n\nA malicious x86 PV guest can most likely crash Xen leading to a denial\nof service, but memory corruption or privilege escalation cannot be\nruled out."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:32:52.043Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-505.html"
}
],
"title": "evtchn: Race between FIFO expand and reset",
"workarounds": [
{
"lang": "en",
"value": "There are no mitigations."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62432",
"datePublished": "2026-07-28T12:32:52.043Z",
"dateReserved": "2026-07-14T10:28:12.655Z",
"dateUpdated": "2026-07-28T16:33:32.509Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62431 (GCVE-0-2026-62431)
Vulnerability from cvelistv5
Published
2026-07-28 12:32
Modified
2026-07-28 16:33
Severity ?
VLAI Severity ?
EPSS score ?
Summary
The logic to handle periodic Viridian STIMERs performs a division with an
unchecked user-controlled divisor value, that can be set to zero to cause a #DE
fault.
References
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-07-28T16:33:31.447Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://xenbits.xen.org/xsa/advisory-504.html"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/07/28/20"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62431",
"options": [
{
"Exploitation": "none"
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"descriptions": [
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"cweId": "CWE-369",
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],
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"title": "CISA ADP Vulnrichment"
}
],
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{
"defaultStatus": "unknown",
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"versions": [
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}
]
}
],
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"lang": "en",
"value": "All Xen versions from 4.13 onwards are vulnerable. Xen versions 4.12 and\nearlier are not vulnerable.\n\nOnly HVM guests with Viridian STIMERs enabled can trigger the vulnerability."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
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}
],
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}
]
}
],
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"dateUpdated": "2026-07-28T12:32:43.849Z",
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"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-504.html"
}
],
"title": "Viridian STIMER division by zero",
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{
"lang": "en",
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}
]
}
},
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"cveId": "CVE-2026-62431",
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CVE-2026-62430 (GCVE-0-2026-62430)
Vulnerability from cvelistv5
Published
2026-07-28 12:32
Modified
2026-07-28 16:33
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Accesses to the CMOS memory contents are done using an indirect IO port
pair. Therefore Xen needs to cache the guest chosen index, and one of
the usages of the index didn't take the necessary locking to avoid
concurrent changes. As a result, a guest could change the index after
it being checked, causing a subsequent out-of-bound read access to the
contents of an array.
References
{
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"title": "CISA ADP Vulnrichment"
}
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"product": "Xen",
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}
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}
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}
],
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"lang": "en",
"value": "An attacker can read out-of-bounds, this is limited to Xen data, and not\ndata belonging to other guests."
}
]
}
],
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"shortName": "XEN"
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{
"url": "https://xenbits.xenproject.org/xsa/advisory-503.html"
}
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"title": "x86: Out-of-bounds read in vRTC emulation",
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CVE-2026-62429 (GCVE-0-2026-62429)
Vulnerability from cvelistv5
Published
2026-07-28 12:32
Modified
2026-07-28 16:33
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Accessing the vNUMA configuration data of a guest is still possible when
domain destruction has already started. The cleaning up of that
configuration information is not synchronized with its retrieval by a
device model controlling the guest.
References
{
"containers": {
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"url": "http://www.openwall.com/lists/oss-security/2026/07/28/18"
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],
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],
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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"defaultStatus": "unknown",
"product": "Xen",
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}
],
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{
"lang": "en",
"value": "While Denial of Service (DoS) affecting the entire host and information\nleaks and are the prevailing effect, a device model stub domain or a\nde-privileged device model running in the control domain may also be\nable to elevate its privileges to that of the host."
}
]
}
],
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CVE-2026-62436 (GCVE-0-2026-62436)
Vulnerability from cvelistv5
Published
2026-07-28 12:32
Modified
2026-07-28 15:17
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
With the introduction of Grant Table v2 came the requirement to be able to
switch between versions. Switching from v1 to v2 reduces the number of
valid grant references, as a bigger shared entry structure is then needed
while the shared table doesn't change size. Switching from v2 back to v1
the status frames, which are separate in v2, go away.
Code holding, but intermediately dropping and then re-acquiring the grant
table lock, sometimes wrongly assumes that said properties wouldn't change
across the window in time where the lock is not being held.
The v1 -> v2 issue is CVE-2026-62435.
The v2 -> v1 issue is CVE-2026-62436.
References
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"version": "2.0.3"
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"type": "CWE"
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]
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],
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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{
"defaultStatus": "unknown",
"product": "Xen",
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}
],
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},
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CVE-2026-62435 (GCVE-0-2026-62435)
Vulnerability from cvelistv5
Published
2026-07-28 12:32
Modified
2026-07-28 15:19
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
With the introduction of Grant Table v2 came the requirement to be able to
switch between versions. Switching from v1 to v2 reduces the number of
valid grant references, as a bigger shared entry structure is then needed
while the shared table doesn't change size. Switching from v2 back to v1
the status frames, which are separate in v2, go away.
Code holding, but intermediately dropping and then re-acquiring the grant
table lock, sometimes wrongly assumes that said properties wouldn't change
across the window in time where the lock is not being held.
The v1 -> v2 issue is CVE-2026-62435.
The v2 -> v1 issue is CVE-2026-62436.
References
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"type": "CWE"
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"descriptions": [
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],
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},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-501.html"
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}
]
}
},
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"assignerShortName": "XEN",
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"datePublished": "2026-07-28T12:32:16.287Z",
"dateReserved": "2026-07-14T10:28:12.655Z",
"dateUpdated": "2026-07-28T15:19:30.368Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62428 (GCVE-0-2026-62428)
Vulnerability from cvelistv5
Published
2026-07-28 12:32
Modified
2026-07-28 16:33
Severity ?
VLAI Severity ?
EPSS score ?
Summary
When grant-copy operations are processed, the respective grant may or may
not already be in use by another operation (a mapping or another copy).
For all copy operations the referenced guest frame is looked up. When
another operation is already active for the grant (the grant is "pinned"),
what is being supplied back to actually carry out permission checks and
copy operation may not be consistent: The permission check may be carried
out on a page different from the one involved in the copy.
References
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-07-28T16:33:28.183Z",
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"references": [
{
"url": "http://xenbits.xen.org/xsa/advisory-500.html"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/07/28/16"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
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"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
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"version": "3.1"
}
},
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"other": {
"content": {
"id": "CVE-2026-62428",
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"version": "2.0.3"
},
"type": "ssvc"
}
}
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"descriptions": [
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"cweId": "CWE-367",
"description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:10:53.004Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
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"status": "unknown",
"version": "consult Xen advisory XSA-500"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from 4.2 onwards are vulnerable. Xen versions 4.1 and\nearlier are not vulnerable.\n\nXen versions 4.13 and newer offer a way to build Xen without grant table\nsupport. Such hypervisors (CONFIG_GRANT_TABLE turned off) are not\nvulnerable."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Roman S."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "When grant-copy operations are processed, the respective grant may or may\nnot already be in use by another operation (a mapping or another copy).\nFor all copy operations the referenced guest frame is looked up. When\nanother operation is already active for the grant (the grant is \"pinned\"),\nwhat is being supplied back to actually carry out permission checks and\ncopy operation may not be consistent: The permission check may be carried\nout on a page different from the one involved in the copy."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "An unprivileged guest may be able to elevate its privileges to that of the\nhost. Information leaks and Denial of Service (DoS) are possible as well."
}
]
}
],
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"dateUpdated": "2026-07-28T12:32:07.573Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-500.html"
}
],
"title": "grant-table: type confusion in grant-copy",
"workarounds": [
{
"lang": "en",
"value": "There is no known mitigation."
}
]
}
},
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"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62428",
"datePublished": "2026-07-28T12:32:07.573Z",
"dateReserved": "2026-07-14T10:28:12.655Z",
"dateUpdated": "2026-07-28T16:33:28.183Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62427 (GCVE-0-2026-62427)
Vulnerability from cvelistv5
Published
2026-07-28 12:31
Modified
2026-07-28 15:54
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
To manage the system, sysctl and platform operations are used by the
control domain or a possible Xenstore domain. Some of these operations
may not be executed in parallel, so a system-wide lock each is used.
The way those locks are acquired is, however, not providing any fairness.
Furthermore, with XSM/Flask in use, the lock acquire will, for some
operations, occur ahead of any permission checking.
The sysctl issue is CVE-2026-62426.
The platform-op issue is CVE-2026-62427.
References
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62427",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:54:13.421567Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
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{
"descriptions": [
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"cweId": "CWE-284",
"description": "CWE-284 Improper Access Control",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-305",
"description": "CWE-305 Authentication Bypass by Primary Weakness",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:54:19.508Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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"product": "Xen",
"vendor": "Xen",
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}
]
}
],
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"lang": "en",
"value": "All Xen versions from 4.0 onwards are vulnerable. Earlier versions use\na different locking operation, but may also be vulnerable."
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],
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"lang": "en",
"type": "finder",
"value": "This issue was discovered by Jan Beulich of SUSE."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nTo manage the system, sysctl and platform operations are used by the\ncontrol domain or a possible Xenstore domain. Some of these operations\nmay not be executed in parallel, so a system-wide lock each is used.\nThe way those locks are acquired is, however, not providing any fairness.\nFurthermore, with XSM/Flask in use, the lock acquire will, for some\noperations, occur ahead of any permission checking.\n\nThe sysctl issue is CVE-2026-62426.\n\nThe platform-op issue is CVE-2026-62427."
}
],
"impacts": [
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{
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"value": "A less privileged entity may stall an equally or more privileged entity,\npotentially leading to a Denial od Service (DoS) of up to the entire\nhost."
}
]
}
],
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},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-499.html"
}
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}
]
}
},
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"datePublished": "2026-07-28T12:31:57.645Z",
"dateReserved": "2026-07-14T10:28:12.655Z",
"dateUpdated": "2026-07-28T15:54:19.508Z",
"state": "PUBLISHED"
},
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}
CVE-2026-62426 (GCVE-0-2026-62426)
Vulnerability from cvelistv5
Published
2026-07-28 12:31
Modified
2026-07-28 15:55
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
To manage the system, sysctl and platform operations are used by the
control domain or a possible Xenstore domain. Some of these operations
may not be executed in parallel, so a system-wide lock each is used.
The way those locks are acquired is, however, not providing any fairness.
Furthermore, with XSM/Flask in use, the lock acquire will, for some
operations, occur ahead of any permission checking.
The sysctl issue is CVE-2026-62426.
The platform-op issue is CVE-2026-62427.
References
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62426",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:55:06.523957Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-667",
"description": "CWE-667 Improper Locking",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-412",
"description": "CWE-412 Unrestricted Externally Accessible Lock",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:55:11.598Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-499"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from 4.0 onwards are vulnerable. Earlier versions use\na different locking operation, but may also be vulnerable."
}
],
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"lang": "en",
"type": "finder",
"value": "This issue was discovered by Jan Beulich of SUSE."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nTo manage the system, sysctl and platform operations are used by the\ncontrol domain or a possible Xenstore domain. Some of these operations\nmay not be executed in parallel, so a system-wide lock each is used.\nThe way those locks are acquired is, however, not providing any fairness.\nFurthermore, with XSM/Flask in use, the lock acquire will, for some\noperations, occur ahead of any permission checking.\n\nThe sysctl issue is CVE-2026-62426.\n\nThe platform-op issue is CVE-2026-62427."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A less privileged entity may stall an equally or more privileged entity,\npotentially leading to a Denial od Service (DoS) of up to the entire\nhost."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:57.586Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-499.html"
}
],
"title": "sysctl and platform-op locks open to abuse",
"workarounds": [
{
"lang": "en",
"value": "There is no known mitigation."
}
]
}
},
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"assignerShortName": "XEN",
"cveId": "CVE-2026-62426",
"datePublished": "2026-07-28T12:31:57.586Z",
"dateReserved": "2026-07-14T10:28:12.655Z",
"dateUpdated": "2026-07-28T15:55:11.598Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.2"
}
CVE-2026-62425 (GCVE-0-2026-62425)
Vulnerability from cvelistv5
Published
2026-07-28 12:31
Modified
2026-07-28 15:40
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
* The directory loop itself assumes a good record length. This is
CVE-2026-42494.
* The calculation of the System Use area may underflow. This is
CVE-2026-42495.
* The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423.
* The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424.
* The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
References
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62425",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:40:12.638109Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "CWE-20 Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:40:37.904Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-497"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from at least 3.2 onwards are affected. Older versions\nhave not been inspected."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Syed Abdul Khaliq of BugQore."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nThe directory and Rock Ridge / SUSP walk in libfsimage\u0027s iso9660 driver\nderives several lengths directly from attacker-controlled on-disk fields\nwithout validating them:\n\n * The directory loop itself assumes a good record length. This is\n CVE-2026-42494.\n\n * The calculation of the System Use area may underflow. This is\n CVE-2026-42495.\n\n * The Rock Ridge extension loop assumes a good (inner) record length.\n This is CVE-2026-62423.\n\n * The Rock Ridge NM record processing assumes a good entry length.\n This is CVE-2026-62424.\n\n * The Rock Ridge CE record processing assumes a good size and offset.\n This is CVE-2026-62425."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A guest using pygrub can escalate its privilege to that of the domain\nconstruction tools (i.e., normally, to control of the host).\n\nIf the mechanism introduced by XSA-443 (see the mitigation section below)\nis in use, then the guest can only escalate to this limited context."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:41.918Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-497.html"
}
],
"title": "buffer overruns in libfsimage iso9660 handling",
"workarounds": [
{
"lang": "en",
"value": "XSA-443 added a mechanism to run pygrub de-privileged. Using this mode\nwill mitigate the vulnerability.\n\nEnsuring that guests do not use the pygrub bootloader will avoid this\nvulnerability.\n\nFor cases where the PV guest is known to be 64bit, and uses grub2 as a\nbootloader, pvgrub is a suitable alternative to pygrub.\n\nRunning only HVM or PVH guests will avoid the vulnerability."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62425",
"datePublished": "2026-07-28T12:31:41.918Z",
"dateReserved": "2026-07-14T10:28:12.654Z",
"dateUpdated": "2026-07-28T15:40:37.904Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62424 (GCVE-0-2026-62424)
Vulnerability from cvelistv5
Published
2026-07-28 12:31
Modified
2026-07-28 14:53
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
* The directory loop itself assumes a good record length. This is
CVE-2026-42494.
* The calculation of the System Use area may underflow. This is
CVE-2026-42495.
* The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423.
* The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424.
* The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
References
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62424",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T14:53:03.759623Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-130",
"description": "CWE-130 Improper Handling of Length Parameter Inconsistency",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T14:53:51.529Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-497"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from at least 3.2 onwards are affected. Older versions\nhave not been inspected."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Syed Abdul Khaliq of BugQore."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nThe directory and Rock Ridge / SUSP walk in libfsimage\u0027s iso9660 driver\nderives several lengths directly from attacker-controlled on-disk fields\nwithout validating them:\n\n * The directory loop itself assumes a good record length. This is\n CVE-2026-42494.\n\n * The calculation of the System Use area may underflow. This is\n CVE-2026-42495.\n\n * The Rock Ridge extension loop assumes a good (inner) record length.\n This is CVE-2026-62423.\n\n * The Rock Ridge NM record processing assumes a good entry length.\n This is CVE-2026-62424.\n\n * The Rock Ridge CE record processing assumes a good size and offset.\n This is CVE-2026-62425."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A guest using pygrub can escalate its privilege to that of the domain\nconstruction tools (i.e., normally, to control of the host).\n\nIf the mechanism introduced by XSA-443 (see the mitigation section below)\nis in use, then the guest can only escalate to this limited context."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:41.862Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-497.html"
}
],
"title": "buffer overruns in libfsimage iso9660 handling",
"workarounds": [
{
"lang": "en",
"value": "XSA-443 added a mechanism to run pygrub de-privileged. Using this mode\nwill mitigate the vulnerability.\n\nEnsuring that guests do not use the pygrub bootloader will avoid this\nvulnerability.\n\nFor cases where the PV guest is known to be 64bit, and uses grub2 as a\nbootloader, pvgrub is a suitable alternative to pygrub.\n\nRunning only HVM or PVH guests will avoid the vulnerability."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62424",
"datePublished": "2026-07-28T12:31:41.862Z",
"dateReserved": "2026-07-14T10:28:12.654Z",
"dateUpdated": "2026-07-28T14:53:51.529Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-62423 (GCVE-0-2026-62423)
Vulnerability from cvelistv5
Published
2026-07-28 12:31
Modified
2026-07-28 14:51
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
* The directory loop itself assumes a good record length. This is
CVE-2026-42494.
* The calculation of the System Use area may underflow. This is
CVE-2026-42495.
* The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423.
* The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424.
* The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
References
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-62423",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T14:49:36.986097Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-130",
"description": "CWE-130 Improper Handling of Length Parameter Inconsistency",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T14:51:03.684Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-497"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from at least 3.2 onwards are affected. Older versions\nhave not been inspected."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Syed Abdul Khaliq of BugQore."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nThe directory and Rock Ridge / SUSP walk in libfsimage\u0027s iso9660 driver\nderives several lengths directly from attacker-controlled on-disk fields\nwithout validating them:\n\n * The directory loop itself assumes a good record length. This is\n CVE-2026-42494.\n\n * The calculation of the System Use area may underflow. This is\n CVE-2026-42495.\n\n * The Rock Ridge extension loop assumes a good (inner) record length.\n This is CVE-2026-62423.\n\n * The Rock Ridge NM record processing assumes a good entry length.\n This is CVE-2026-62424.\n\n * The Rock Ridge CE record processing assumes a good size and offset.\n This is CVE-2026-62425."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A guest using pygrub can escalate its privilege to that of the domain\nconstruction tools (i.e., normally, to control of the host).\n\nIf the mechanism introduced by XSA-443 (see the mitigation section below)\nis in use, then the guest can only escalate to this limited context."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:41.801Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-497.html"
}
],
"title": "buffer overruns in libfsimage iso9660 handling",
"workarounds": [
{
"lang": "en",
"value": "XSA-443 added a mechanism to run pygrub de-privileged. Using this mode\nwill mitigate the vulnerability.\n\nEnsuring that guests do not use the pygrub bootloader will avoid this\nvulnerability.\n\nFor cases where the PV guest is known to be 64bit, and uses grub2 as a\nbootloader, pvgrub is a suitable alternative to pygrub.\n\nRunning only HVM or PVH guests will avoid the vulnerability."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-62423",
"datePublished": "2026-07-28T12:31:41.801Z",
"dateReserved": "2026-07-14T10:28:12.654Z",
"dateUpdated": "2026-07-28T14:51:03.684Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-42495 (GCVE-0-2026-42495)
Vulnerability from cvelistv5
Published
2026-07-28 12:31
Modified
2026-07-28 15:01
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
* The directory loop itself assumes a good record length. This is
CVE-2026-42494.
* The calculation of the System Use area may underflow. This is
CVE-2026-42495.
* The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423.
* The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424.
* The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
References
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-42495",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:00:30.511503Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-191",
"description": "CWE-191 Integer Underflow (Wrap or Wraparound)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:01:03.756Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-497"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from at least 3.2 onwards are affected. Older versions\nhave not been inspected."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Syed Abdul Khaliq of BugQore."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nThe directory and Rock Ridge / SUSP walk in libfsimage\u0027s iso9660 driver\nderives several lengths directly from attacker-controlled on-disk fields\nwithout validating them:\n\n * The directory loop itself assumes a good record length. This is\n CVE-2026-42494.\n\n * The calculation of the System Use area may underflow. This is\n CVE-2026-42495.\n\n * The Rock Ridge extension loop assumes a good (inner) record length.\n This is CVE-2026-62423.\n\n * The Rock Ridge NM record processing assumes a good entry length.\n This is CVE-2026-62424.\n\n * The Rock Ridge CE record processing assumes a good size and offset.\n This is CVE-2026-62425."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A guest using pygrub can escalate its privilege to that of the domain\nconstruction tools (i.e., normally, to control of the host).\n\nIf the mechanism introduced by XSA-443 (see the mitigation section below)\nis in use, then the guest can only escalate to this limited context."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:41.743Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-497.html"
}
],
"title": "buffer overruns in libfsimage iso9660 handling",
"workarounds": [
{
"lang": "en",
"value": "XSA-443 added a mechanism to run pygrub de-privileged. Using this mode\nwill mitigate the vulnerability.\n\nEnsuring that guests do not use the pygrub bootloader will avoid this\nvulnerability.\n\nFor cases where the PV guest is known to be 64bit, and uses grub2 as a\nbootloader, pvgrub is a suitable alternative to pygrub.\n\nRunning only HVM or PVH guests will avoid the vulnerability."
}
]
}
},
"cveMetadata": {
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"assignerShortName": "XEN",
"cveId": "CVE-2026-42495",
"datePublished": "2026-07-28T12:31:41.743Z",
"dateReserved": "2026-04-27T14:20:24.139Z",
"dateUpdated": "2026-07-28T15:01:03.756Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-42494 (GCVE-0-2026-42494)
Vulnerability from cvelistv5
Published
2026-07-28 12:31
Modified
2026-07-28 15:04
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
* The directory loop itself assumes a good record length. This is
CVE-2026-42494.
* The calculation of the System Use area may underflow. This is
CVE-2026-42495.
* The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423.
* The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424.
* The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
References
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-42494",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:04:14.686627Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125 Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:04:48.405Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-497"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "All Xen versions from at least 3.2 onwards are affected. Older versions\nhave not been inspected."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Syed Abdul Khaliq of BugQore."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "[This CNA information record relates to multiple CVEs; the\ntext explains which aspects/vulnerabilities correspond to which CVE.]\n\nThe directory and Rock Ridge / SUSP walk in libfsimage\u0027s iso9660 driver\nderives several lengths directly from attacker-controlled on-disk fields\nwithout validating them:\n\n * The directory loop itself assumes a good record length. This is\n CVE-2026-42494.\n\n * The calculation of the System Use area may underflow. This is\n CVE-2026-42495.\n\n * The Rock Ridge extension loop assumes a good (inner) record length.\n This is CVE-2026-62423.\n\n * The Rock Ridge NM record processing assumes a good entry length.\n This is CVE-2026-62424.\n\n * The Rock Ridge CE record processing assumes a good size and offset.\n This is CVE-2026-62425."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "A guest using pygrub can escalate its privilege to that of the domain\nconstruction tools (i.e., normally, to control of the host).\n\nIf the mechanism introduced by XSA-443 (see the mitigation section below)\nis in use, then the guest can only escalate to this limited context."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:41.682Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-497.html"
}
],
"title": "buffer overruns in libfsimage iso9660 handling",
"workarounds": [
{
"lang": "en",
"value": "XSA-443 added a mechanism to run pygrub de-privileged. Using this mode\nwill mitigate the vulnerability.\n\nEnsuring that guests do not use the pygrub bootloader will avoid this\nvulnerability.\n\nFor cases where the PV guest is known to be 64bit, and uses grub2 as a\nbootloader, pvgrub is a suitable alternative to pygrub.\n\nRunning only HVM or PVH guests will avoid the vulnerability."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-42494",
"datePublished": "2026-07-28T12:31:41.682Z",
"dateReserved": "2026-04-27T14:20:24.139Z",
"dateUpdated": "2026-07-28T15:04:48.405Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-42492 (GCVE-0-2026-42492)
Vulnerability from cvelistv5
Published
2026-07-28 12:31
Modified
2026-07-28 16:33
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Xenstore, to have an up-to-date picture of the entire system, wants to
know of domains appearing and disappearing. To make this more robust, a
new XEN_DOMCTL_get_domain_state was introduced. The management of the
bitmap underlying that operation is tied into the binding of the
VIRQ_DOM_EXC virtual IRQ. Unfortunately an error path there would tear
down the bitmap even in cases when it wasn't set up. Unprivileged domains
can trigger that error path.
References
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-07-28T16:33:22.683Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://xenbits.xen.org/xsa/advisory-496.html"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/07/28/13"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-42492",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-28T15:56:49.876014Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-459",
"description": "CWE-459 Incomplete Cleanup",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T15:56:54.437Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Xen",
"vendor": "Xen",
"versions": [
{
"status": "unknown",
"version": "consult Xen advisory XSA-496"
}
]
}
],
"configurations": [
{
"lang": "en",
"value": "Xen 4.21 and onwards are vulnerable. Xen 4.20 and older are not\nvulnerable."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Grygorii Strashko of EPAM."
}
],
"datePublic": "2026-07-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing and disappearing. To make this more robust, a\nnew XEN_DOMCTL_get_domain_state was introduced. The management of the\nbitmap underlying that operation is tied into the binding of the\nVIRQ_DOM_EXC virtual IRQ. Unfortunately an error path there would tear\ndown the bitmap even in cases when it wasn\u0027t set up. Unprivileged domains\ncan trigger that error path."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "An unprivileged domain can affect the operation of Xenstore, potentially\nleading to a Denial of Service (DoS) affecting the entire host. A\nhypervisor crash with similar host wide effect also is possible, albeit\nunlikely."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-28T12:31:28.304Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-496.html"
}
],
"title": "vIRQ event channel binding may break Xenstore",
"workarounds": [
{
"lang": "en",
"value": "There is no known mitigation."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"assignerShortName": "XEN",
"cveId": "CVE-2026-42492",
"datePublished": "2026-07-28T12:31:28.304Z",
"dateReserved": "2026-04-27T14:20:24.139Z",
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CVE-2026-42493 (GCVE-0-2026-42493)
Vulnerability from cvelistv5
Published
2026-07-28 12:31
Modified
2026-07-28 16:33
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Addressing certain issues, in particular related to operations which may
take excessively long and therefore would need preemption, has turned out
overly costly. Since alternatives (HVM/PVH: HAP, PV: shim) are commonly
available, the decision was to deprecate the functionality, while still
retaining it for people to use at their own (security) risk. Memory-wise
small enough guests may still be okay to run.
References
{
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CVE-2026-42488 (GCVE-0-2026-42488)
Vulnerability from cvelistv5
Published
2026-06-18 13:47
Modified
2026-06-18 15:07
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Some shadow paging errors paths will switch the page-tables without
updating the currently running vCPU reference. This causes a mismatch
between the loaded page-tables and the mapcache metadata which can lead
to corruption of the mapcache.
References
{
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"title": "CISA ADP Vulnrichment"
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}
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}
],
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CVE-2026-42490 (GCVE-0-2026-42490)
Vulnerability from cvelistv5
Published
2026-06-18 13:47
Modified
2026-06-18 15:04
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
To create and manage guests, domctl operations are used by the control
domain, a possible Xenstore domain, or by a domain controlling a
particular guest. Some of these operations may not be executed in
parallel, so a system-wide lock is used. The way that lock is acquired
is, however, not providing any fairness. This is CVE-2026-42489.
Furthermore, with XSM/Flask in use, the lock acquire will, for some
operations, occur ahead of any permission checking. This is
CVE-2026-42490.
References
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],
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CVE-2026-42489 (GCVE-0-2026-42489)
Vulnerability from cvelistv5
Published
2026-06-18 13:47
Modified
2026-06-18 15:04
Severity ?
VLAI Severity ?
EPSS score ?
Summary
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
To create and manage guests, domctl operations are used by the control
domain, a possible Xenstore domain, or by a domain controlling a
particular guest. Some of these operations may not be executed in
parallel, so a system-wide lock is used. The way that lock is acquired
is, however, not providing any fairness. This is CVE-2026-42489.
Furthermore, with XSM/Flask in use, the lock acquire will, for some
operations, occur ahead of any permission checking. This is
CVE-2026-42490.
References
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CVE-2026-42487 (GCVE-0-2026-42487)
Vulnerability from cvelistv5
Published
2026-06-18 13:46
Modified
2026-06-18 15:07
Severity ?
VLAI Severity ?
EPSS score ?
Summary
HVM guest I/O port accesses are subject to either emulation or at least
translation. Translations are managed by the device model (via
XEN_DOMCTL_ioport_mapping), and hence the linked list used may changed
at any time. Traversal of those lists (while handling guest I/O port
accesses) therefore needs synchronizing with updates, which was missing
so far.
References
{
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"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H",
"version": "3.1"
}
},
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}
],
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"timestamp": "2026-06-18T14:35:06.701148Z",
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"type": "CWE"
}
]
}
],
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2026-06-18T15:07:31.335Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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},
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"url": "http://www.openwall.com/lists/oss-security/2026/06/09/11"
}
],
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}
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}
],
"impacts": [
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{
"lang": "en",
"value": "A device model of a HVM guest can cause a hypervisor crash, causing a\nDenial of Service (DoS) of the entire host. Privilege escalation and\ninformation leaks cannot be ruled out."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-18T13:46:53.459Z",
"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f",
"shortName": "XEN"
},
"references": [
{
"url": "https://xenbits.xenproject.org/xsa/advisory-491.html"
}
],
"title": "x86 HVM I/O port list traversal",
"workarounds": [
{
"lang": "en",
"value": "Running only PV or PVH guests will avoid the vulnerability.\n\n(Switching from a device model stub domain or a de-privileged device\nmodel to a fully privileged Dom0 device model does NOT mitigate this\nvulnerability. Rather, it simply recategorises the vulnerability to\nhostile management code, regarding it \"as designed\"; thus it merely\nreclassifies these issues as \"not a bug\". The security of a Xen system\nusing stub domains is still better than with a qemu-dm running as a Dom0\nprocess. Users and vendors of stub qemu dm systems should not change\ntheir configuration to use a Dom0 qemu process.)"
}
]
}
},
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"cveId": "CVE-2026-42487",
"datePublished": "2026-06-18T13:46:53.459Z",
"dateReserved": "2026-04-27T14:20:24.138Z",
"dateUpdated": "2026-06-18T15:07:31.335Z",
"state": "PUBLISHED"
},
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CVE-2026-23558 (GCVE-0-2026-23558)
Vulnerability from cvelistv5
Published
2026-05-19 12:49
Modified
2026-05-20 03:55
Severity ?
VLAI Severity ?
EPSS score ?
Summary
The adjustments made for XSA-379 as well as those subsequently becoming
XSA-387 still left a race window, when a HVM or PVH guest does a grant
table version change from v2 to v1 in parallel with mapping the status
page(s) via XENMEM_add_to_physmap. Some of the status pages may then be
freed while mappings of them would still be inserted into the guest's
secondary (P2M) page tables.
References
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-05-19T13:06:51.044Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"references": [
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"url": "http://www.openwall.com/lists/oss-security/2026/04/28/13"
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{
"url": "http://xenbits.xen.org/xsa/advisory-486.html"
}
],
"title": "CVE Program Container"
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{
"metrics": [
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"cvssV3_1": {
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
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"scope": "CHANGED",
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"version": "2.0.3"
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"descriptions": [
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"cweId": "CWE-362",
"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-20T03:55:35.327Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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{
"defaultStatus": "unknown",
"product": "Xen",
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}
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}
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"lang": "en",
"value": "All Xen versions from 4.0 onwards are affected. Xen versions 3.4 and\nolder are not affected.\n\nOnly x86 HVM and PVH guests permitted to use grant table version 2\ninterfaces can leverage this vulnerability. x86 PV guests cannot\nleverage this vulnerability. On Arm, grant table v2 use is explicitly\nunsupported."
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "This issue was discovered by Claude Opus 4.6 and diagnosed as a security\nissue by Rafal Wojtczuk."
}
],
"datePublic": "2026-04-28T12:00:00.000Z",
"descriptions": [
{
"lang": "en",
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}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "Privilege escalation, information leaks, and Denial of Service (DoS) up\nto affecting the entire host cannot be excluded."
}
]
}
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"url": "https://xenbits.xenproject.org/xsa/advisory-486.html"
}
],
"title": "grant table v2 race in status page mapping",
"workarounds": [
{
"lang": "en",
"value": "Using the \"gnttab=max-ver:1\" hypervisor command line option will avoid\nthe vulnerability.\n\nUsing the \"max_grant_version=1\" guest configuration option for HVM and PVH\nguests will also avoid the vulnerability."
}
]
}
},
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"datePublished": "2026-05-19T12:49:54.652Z",
"dateReserved": "2026-01-14T13:07:36.961Z",
"dateUpdated": "2026-05-20T03:55:35.327Z",
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CVE-2026-23557 (GCVE-0-2026-23557)
Vulnerability from cvelistv5
Published
2026-05-19 12:49
Modified
2026-05-19 14:42
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES
command within a transaction due to an assert() triggering.
In case xenstored was built with NDEBUG #defined nothing bad will
happen, as assert() is doing nothing in this case. Note that the
default is not to define NDEBUG for xenstored builds even in release
builds of Xen.
References
{
"containers": {
"adp": [
{
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"shortName": "CVE"
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"url": "http://www.openwall.com/lists/oss-security/2026/04/28/11"
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{
"url": "http://xenbits.xen.org/xsa/advisory-484.html"
}
],
"title": "CVE Program Container"
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"scope": "CHANGED",
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},
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"timestamp": "2026-05-19T14:42:12.994792Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
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"descriptions": [
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"cweId": "CWE-617",
"description": "CWE-617 Reachable Assertion",
"lang": "en",
"type": "CWE"
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]
}
],
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"version": "consult Xen advisory XSA-484"
}
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}
],
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}
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"lang": "en",
"type": "finder",
"value": "This issue was discovered by Andrii Sultanov of Vates."
}
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{
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}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "Any unprivileged domain can cause xenstored to crash, causing a\nDoS (denial of service) for any Xenstore action. This will result\nin an inability to perform further domain administration on the host."
}
]
}
],
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{
"url": "https://xenbits.xenproject.org/xsa/advisory-484.html"
}
],
"title": "Xenstored DoS via XS_RESET_WATCHES command",
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"lang": "en",
"value": "There is no known mitigation available."
}
]
}
},
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