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CERTFR-2026-AVI-1485
Vulnerability from certfr_avis - Published: 2026-11-09 - Updated: 2026-11-09
De multiples vulnérabilités ont été découvertes dans Xen. Elles permettent à un attaquant de provoquer une élévation de privilèges, une atteinte à la confidentialité des données et un déni de service.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
| 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-2026-100080",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-100080"
},
{
"name": "CVE-2026-100081",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-100081"
},
{
"name": "CVE-2026-100082",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-100082"
}
],
"initial_release_date": "2026-11-09T00:00:00",
"last_revision_date": "2026-11-09T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1485",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-11-09T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service"
},
{
"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, une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es et un d\u00e9ni de service.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Xen",
"vendor_advisories": [
{
"published_at": "2026-11-06",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-526",
"url": "https://xenbits.xen.org/xsa/advisory-526.html"
},
{
"published_at": "2026-11-06",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-527",
"url": "https://xenbits.xen.org/xsa/advisory-527.html"
},
{
"published_at": "2026-11-06",
"title": "Bulletin de s\u00e9curit\u00e9 Xen xsa/advisory-528",
"url": "https://xenbits.xen.org/xsa/advisory-528.html"
}
]
}
CVE-2026-100080 (GCVE-0-2026-100080)
Vulnerability from cvelistv5 – Published: 2026-11-06 18:23 – Updated: 2026-11-06 19:08| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4223b33be49ee09acb6f1d26beb4a36dd3b8d63a
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ab9cdf1291be551da999510b30216a2886074d7a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 36f858f228e3f955b9336af7f94634747c221518 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 89e534265b62c94749639350200b10370564bb3a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6cd611d2abdd8623a554e14145f82c1cb4e4467a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 37d5a73170579b30e67cc8b19ec69715eea3a6b6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4867687b6ad28ab84bc0811d8f8f9972e769da02 (git) Affected: 0 , < 5.10.274 (semver) Affected: 0 , < 5.15.225 (semver) Affected: 0 , < 6.1.192 (semver) Affected: 0 , < 6.6.162 (semver) Affected: 0 , < 6.12.116 (semver) Affected: 0 , < 6.18.62 (semver) Affected: 0 , < 7.3.3 (semver) |
|
| Linux | Linux |
Unaffected:
5.10.274 , ≤ 5.10.*
(semver)
Unaffected: 5.15.225 , ≤ 5.15.* (semver) Unaffected: 6.1.192 , ≤ 6.1.* (semver) Unaffected: 6.6.162 , ≤ 6.6.* (semver) Unaffected: 6.12.116 , ≤ 6.12.* (semver) Unaffected: 6.18.62 , ≤ 6.18.* (semver) Unaffected: 7.3.3 , ≤ 7.3.* (semver) |
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CVE-2026-100081 (GCVE-0-2026-100081)
Vulnerability from cvelistv5 – Published: 2026-11-06 18:23 – Updated: 2026-11-10 16:57| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
b17075d5c1988b83f840d272c795ac17d57ce804 , < 96e05a8ce243e2207704e2e7a6e7d1172730f515
(git)
Affected: b17075d5c1988b83f840d272c795ac17d57ce804 , < 0e786123e46d08d2247ce93a5435e45ed9f4c5d1 (git) Affected: b17075d5c1988b83f840d272c795ac17d57ce804 , < 990d123d9eaa3ac6c979eed245658676d65ce0db (git) Affected: b17075d5c1988b83f840d272c795ac17d57ce804 , < 0d515c409033c8e2a645a781be3ca76ab825fc8c (git) Affected: b17075d5c1988b83f840d272c795ac17d57ce804 , < a6bb2f1fa62c56279bdcdadce28d1310c5e12b62 (git) Affected: b17075d5c1988b83f840d272c795ac17d57ce804 , < 34f0f63dc6dc11895a17bb5672451b6b11622c99 (git) Affected: b17075d5c1988b83f840d272c795ac17d57ce804 , < fb38fc58acb26d74fe8f7b19621fafaae3c040ff (git) |
|
| Linux | Linux |
Affected:
4.11
Unaffected: 0 , < 4.11 (semver) Unaffected: 5.10.274 , ≤ 5.10.* (semver) Unaffected: 5.15.225 , ≤ 5.15.* (semver) Unaffected: 6.1.192 , ≤ 6.1.* (semver) Unaffected: 6.6.162 , ≤ 6.6.* (semver) Unaffected: 6.12.116 , ≤ 6.12.* (semver) Unaffected: 6.18.62 , ≤ 6.18.* (semver) Unaffected: 7.3.3 , ≤ 7.3.* (semver) |
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"value": "AV:L - The guest reaches the free by changing xenbus state: frontend_changed() calls set_backend_state(), which from XenbusStateConnected calls backend_disconnect() and xenvif_disconnect_data(), where xenvif_mcast_addr_list_free() ran before synchronize_net(). The raced lookup is xenvif_mcast_match() inside xenvif_start_xmit(); the trigger is that xenbus write, not a routable packet field.\nAC:H - xenvif_mcast_match() runs only when xenvif_start_xmit() has already seen VIF_STATUS_CONNECTED and a live queue-\u003etask, but xenvif_mcast_addr_list_free() runs only after xenvif_carrier_off() clears that bit and xenvif_disconnect_queue() returns from kthread_stop(). The lookup does not sleep, so it must be stalled across that teardown; MCAST_ADD plus Closing does not create that stall, and napi_disable() has already finished xenvif_tx_action().\nPR:L - frontend_changed() is the vif backend otherend_changed callback and accepts any connected frontend. The attacker must control that guest\u0027s xenstore frontend state and TX ring, i.e. the guest kernel; a host user namespace has no path to this xenbus backend.\nUI:N - The guest writes its own request-multicast-control key, queues XEN_NETIF_EXTRA_TYPE_MCAST_ADD on the TX ring, and sets the frontend xenbus state to Closing. The host operator does not have to mount media, open a device, or acknowledge a prompt.\nS:C - The use-after-free is in dom0 xen-netback: xenvif_mcast_match() dereferences vif-\u003efe_mcast_addr nodes freed by xenvif_mcast_addr_list_free(). A guest that wins the race crashes or corrupts that backend kernel, crossing the Xen guest-to-host boundary.\nC:H - xenvif_mcast_match() walks fe_mcast_addr under rcu_read_lock() via list_for_each_entry_rcu() and ether_addr_equal() on mcast-\u003eaddr, while xenvif_mcast_addr_list_free() kfree()s those xenvif_mcast_addr nodes with no grace period. A reused node lets the walk follow next pointers into other kernel memory.\nI:H - The freed objects are slab allocations from kzalloc_obj() in xenvif_mcast_add(). xenvif_mcast_match() can still dereference them after kfree() in xenvif_mcast_addr_list_free(), a heap use-after-free in the backend rather than a NULL deref, and XSA-527 treats host privilege escalation from that race as possible.\nA:H - A list walk in xenvif_mcast_match() that follows an fe_mcast_addr node already passed to kfree() by xenvif_mcast_addr_list_free() oopses the backend kernel. XSA-527 describes that fault as a driver crash that can take down the host."
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CVE-2026-100082 (GCVE-0-2026-100082)
Vulnerability from cvelistv5 – Published: 2026-11-06 18:23 – Updated: 2026-11-06 19:08| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 253cff0526781e28b1b0f9fdacd74ecdc23d3ab7
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2c9ccbe0ffcff3615c7ad917c49b67571a41f21c (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 58ba056991dbcec8a75e6861cb4479ac947b69e6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fe9ead8c5bdb752e329cecfecbdb5dfca5e9996b (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b764e17313534794aeb99c901869f213e36a16ef (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c49934da934cf495faf782aa5d84f413221c9be6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b0378161c28e77e4d0e2eda3c9433ab4394d2a2f (git) Affected: 0 , < 5.10.274 (semver) Affected: 0 , < 5.15.225 (semver) Affected: 0 , < 6.1.192 (semver) Affected: 0 , < 6.6.162 (semver) Affected: 0 , < 6.12.116 (semver) Affected: 0 , < 6.18.62 (semver) Affected: 0 , < 7.3.3 (semver) |
|
| Linux | Linux |
Unaffected:
5.10.274 , ≤ 5.10.*
(semver)
Unaffected: 5.15.225 , ≤ 5.15.* (semver) Unaffected: 6.1.192 , ≤ 6.1.* (semver) Unaffected: 6.6.162 , ≤ 6.6.* (semver) Unaffected: 6.12.116 , ≤ 6.12.* (semver) Unaffected: 6.18.62 , ≤ 6.18.* (semver) Unaffected: 7.3.3 , ≤ 7.3.* (semver) |
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| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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