CVE-2026-101305 (GCVE-0-2026-101305)
Vulnerability from cvelistv5 – Published: 2026-10-15 06:46 – Updated: 2026-10-15 06:46
VLAI
EPSS
VEX
Title
Multiple jail filesystem root escapes
Summary
renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail's root.
A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.
Severity
No CVSS data available.
CWE
- CWE-273 - Improper Check for Dropped Privileges
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://security.freebsd.org/advisories/FreeBSD-S… | vendor-advisory |
Impacted products
Date Public
2026-09-29 20:30
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"modules": [
"jail"
],
"product": "FreeBSD",
"vendor": "FreeBSD",
"versions": [
{
"lessThan": "p4",
"status": "affected",
"version": "15.1-RELEASE",
"versionType": "release"
},
{
"lessThan": "p14",
"status": "affected",
"version": "15.0-RELEASE",
"versionType": "release"
},
{
"lessThan": "p1",
"status": "affected",
"version": "14.5-RELEASE",
"versionType": "release"
},
{
"lessThan": "p10",
"status": "affected",
"version": "14.4-RELEASE",
"versionType": "release"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jan Bramkamp"
}
],
"datePublic": "2026-09-29T20:30:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail\u0027s root.\n\nA process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail\u0027s filesystem root restriction."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-273",
"description": "CWE-273: Improper Check for Dropped Privileges",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-15T06:46:16.471Z",
"orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
"shortName": "freebsd"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc"
}
],
"title": "Multiple jail filesystem root escapes",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
"assignerShortName": "freebsd",
"cveId": "CVE-2026-101305",
"datePublished": "2026-10-15T06:46:16.471Z",
"dateReserved": "2026-09-28T13:33:02.323Z",
"dateUpdated": "2026-10-15T06:46:16.471Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-101305",
"date": "2026-10-15",
"epss": "0.0018",
"percentile": "0.07093"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unknown",
"modules": [
"jail"
],
"product": "FreeBSD",
"vendor": "FreeBSD",
"versions": [
{
"lessThan": "p4",
"status": "affected",
"version": "15.1-RELEASE",
"versionType": "release"
},
{
"lessThan": "p14",
"status": "affected",
"version": "15.0-RELEASE",
"versionType": "release"
},
{
"lessThan": "p1",
"status": "affected",
"version": "14.5-RELEASE",
"versionType": "release"
},
{
"lessThan": "p10",
"status": "affected",
"version": "14.4-RELEASE",
"versionType": "release"
}
]
}
],
"source": "secteam@freebsd.org"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail\u0027s root.\n\nA process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail\u0027s filesystem root restriction."
}
],
"id": "CVE-2026-101305",
"lastModified": "2026-10-15T07:17:57.663",
"metrics": {},
"published": "2026-10-15T07:17:57.663",
"references": [
{
"source": "secteam@freebsd.org",
"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc"
}
],
"sourceIdentifier": "secteam@freebsd.org",
"vulnStatus": "Received",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-273"
}
],
"source": "secteam@freebsd.org",
"type": "Secondary"
}
]
}
}
}
}
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