CVE-2026-49418 (GCVE-0-2026-49418)
Vulnerability from cvelistv5
Published
2026-08-19 04:14
Modified
2026-08-20 18:34
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-416 - Use After Free
Summary
When msync(MS_INVALIDATE) is called on a mapping of an unmanaged device object, the physical pages in the mapping range are marked invalid but remain in the pager's page list. A subsequent page fault will cause the fault handler to re-insert the page into the object's list. This corrupts the list, and on object destruction the page is freed twice.
An unprivileged local user with access to a device that provides memory-mapped I/O can trigger a use-after-free in the kernel, though this is limited to a pool of objects ("fictitious pages") that are never recycled for a different purpose. It may be possible to exploit this to escalate privileges.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
"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-2026-49418",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-20T03:56:05.175712Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-20T18:34:37.191Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"modules": [
"vm"
],
"product": "FreeBSD",
"vendor": "FreeBSD",
"versions": [
{
"lessThan": "p1",
"status": "affected",
"version": "15.1-RELEASE",
"versionType": "release"
},
{
"lessThan": "p11",
"status": "affected",
"version": "15.0-RELEASE",
"versionType": "release"
},
{
"lessThan": "p7",
"status": "affected",
"version": "14.4-RELEASE",
"versionType": "release"
},
{
"lessThan": "p16",
"status": "affected",
"version": "14.3-RELEASE",
"versionType": "release"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "slidybat"
}
],
"datePublic": "2026-06-30T20:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "When msync(MS_INVALIDATE) is called on a mapping of an unmanaged device object, the physical pages in the mapping range are marked invalid but remain in the pager\u0027s page list. A subsequent page fault will cause the fault handler to re-insert the page into the object\u0027s list. This corrupts the list, and on object destruction the page is freed twice.\n\nAn unprivileged local user with access to a device that provides memory-mapped I/O can trigger a use-after-free in the kernel, though this is limited to a pool of objects (\"fictitious pages\") that are never recycled for a different purpose. It may be possible to exploit this to escalate privileges."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416: Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T04:14:17.429Z",
"orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
"shortName": "freebsd"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:37.vm.asc"
}
],
"title": "Use-after-free in device pager page list",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
"assignerShortName": "freebsd",
"cveId": "CVE-2026-49418",
"datePublished": "2026-08-19T04:14:17.429Z",
"dateReserved": "2026-05-29T20:24:28.615Z",
"dateUpdated": "2026-08-20T18:34:37.191Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"cna\": {\"datePublic\": \"2026-06-30T20:00:00.000Z\", \"title\": \"Use-after-free in device pager page list\", \"references\": [{\"tags\": [\"vendor-advisory\"], \"url\": \"https://security.freebsd.org/advisories/FreeBSD-SA-26:37.vm.asc\"}], \"affected\": [{\"defaultStatus\": \"unknown\", \"modules\": [\"vm\"], \"product\": \"FreeBSD\", \"vendor\": \"FreeBSD\", \"versions\": [{\"status\": \"affected\", \"versionType\": \"release\", \"version\": \"15.1-RELEASE\", \"lessThan\": \"p1\"}, {\"status\": \"affected\", \"versionType\": \"release\", \"version\": \"15.0-RELEASE\", \"lessThan\": \"p11\"}, {\"status\": \"affected\", \"versionType\": \"release\", \"version\": \"14.4-RELEASE\", \"lessThan\": \"p7\"}, {\"status\": \"affected\", \"versionType\": \"release\", \"version\": \"14.3-RELEASE\", \"lessThan\": \"p16\"}]}], \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"slidybat\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"When msync(MS_INVALIDATE) is called on a mapping of an unmanaged device object, the physical pages in the mapping range are marked invalid but remain in the pager\u0027s page list. A subsequent page fault will cause the fault handler to re-insert the page into the object\u0027s list. This corrupts the list, and on object destruction the page is freed twice.\\n\\nAn unprivileged local user with access to a device that provides memory-mapped I/O can trigger a use-after-free in the kernel, though this is limited to a pool of objects (\\\"fictitious pages\\\") that are never recycled for a different purpose. It may be possible to exploit this to escalate privileges.\"}], \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-416\", \"description\": \"CWE-416: Use After Free\", \"lang\": \"en\", \"type\": \"CWE\"}]}], \"providerMetadata\": {\"orgId\": \"63664ac6-956c-4cba-a5d0-f46076e16109\", \"shortName\": \"freebsd\", \"dateUpdated\": \"2026-08-19T04:14:17.429Z\"}, \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-49418\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-20T03:56:05.175712Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-20T18:34:32.620Z\"}}]}",
"cveMetadata": "{\"cveId\": \"CVE-2026-49418\", \"assignerOrgId\": \"63664ac6-956c-4cba-a5d0-f46076e16109\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"freebsd\", \"dateReserved\": \"2026-05-29T20:24:28.615Z\", \"datePublished\": \"2026-08-19T04:14:17.429Z\", \"dateUpdated\": \"2026-08-20T18:34:37.191Z\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…