HighFix available
util-linux — security advisory
util-linux is a random collection of Linux utilities. In util-linux 2.39 through 2.41.4 and 2.42 through 2.42.1, the SUID `mount` utility's `hook_owner.c` post-mount hook performs path-based `chmod()` and `lchown()` operations on a previously validated mount target. A local low-privileged user authorized by an `/etc/fstab` entry with `user` or `users` and an `X-mount.mode`, `X-mount.owner`, or `X-mount.group` option can use `renameat2(RENAME_EXCHANGE)` to race a writable ancestor of the target and redirect the privileged ownership or mode change to a root-owned path, potentially gaining root privileges. This issue is fixed in 2.41.5 and 2.42.2.
- Products
- util-linux
- Affected versions
- 2.41-5, 2.41.1-1, 2.41.1-2, 2.41.1-3, 2.41.1-4, 2.41.2-1, 2.41.2-2, 2.41.2-3, 2.41.2-4, 2.41.3-1, 2.41.3-2, 2.41.3-3, 2.41.3-4, 2.42-1, 2.42-2, 2.42-3, 2.42-4, 2.42-5, 2.42-6, 2.42.1-1, 2.42.1-2, 2.42.1-3, 2.42.1-4, 2.42.1-5, 2.42.1-6, 2.42~rc1-1, 2.42~rc1-2, 2.42~rc1-3, 2.42~rc2-1
- Fixed versions
- 2.41.5-0+deb13u1, 2.42.2-1
- CVEs
- CVE-2026-53612
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:38 UTC · Revision 1
Source evidence
util-linux is a random collection of Linux utilities. In util-linux 2.39 through 2.41.4 and 2.42 through 2.42.1, the SUID `mount` utility's `hook_owner.c` post-mount hook performs path-based `chmod()` and `lchown()` operations on a previously validated mount target. A local low-privileged user authorized by an `/etc/fstab` entry with `user` or `users` and an `X-mount.mode`, `X-mount.owner`, or `X-mount.group` option can use `renameat2(RENAME_EXCHANGE)` to race a writable ancestor of the target and redirect the privileged ownership or mode change to a root-owned path, potentially gaining root privileges. This issue is fixed in 2.41.5 and 2.42.2.
osv:DEBIAN-CVE-2026-53612
util-linux
Fixed versions: 2.41.5-0+deb13u1
util-linux
Fixed versions: 2.42.2-1
Complete source record
{
"id": "288e8f88b86f01b14267131c2e6bd0c7ad13352ff9fe76fd8a85eddd2f4a1cb1",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-53612",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-53612",
"summary": "util-linux is a random collection of Linux utilities. In util-linux 2.39 through 2.41.4 and 2.42 through 2.42.1, the SUID `mount` utility's `hook_owner.c` post-mount hook performs path-based `chmod()` and `lchown()` operations on a previously validated mount target. A local low-privileged user authorized by an `/etc/fstab` entry with `user` or `users` and an `X-mount.mode`, `X-mount.owner`, or `X-mount.group` option can use `renameat2(RENAME_EXCHANGE)` to race a writable ancestor of the target and redirect the privileged ownership or mode change to a root-owned path, potentially gaining root privileges. This issue is fixed in 2.41.5 and 2.42.2.",
"evidence": "osv:DEBIAN-CVE-2026-53612",
"products": [
{
"name": {
"value": "util-linux",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.41.5-0+deb13u1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "2.41-5",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.1-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.1-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.2-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.2-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.2-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.3-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.3-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.41.3-4",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "util-linux",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.42.2-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "2.41-5",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.1-3",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.1-4",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.2-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.2-3",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.2-4",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.3-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.3-3",
"evidence": "/affected/1/versions"
},
{
"value": "2.41.3-4",
"evidence": "/affected/1/versions"
},
{
"value": "2.42-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.42-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.42-3",
"evidence": "/affected/1/versions"
},
{
"value": "2.42-4",
"evidence": "/affected/1/versions"
},
{
"value": "2.42-5",
"evidence": "/affected/1/versions"
},
{
"value": "2.42-6",
"evidence": "/affected/1/versions"
},
{
"value": "2.42.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.42.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.42.1-3",
"evidence": "/affected/1/versions"
},
{
"value": "2.42.1-4",
"evidence": "/affected/1/versions"
},
{
"value": "2.42.1-5",
"evidence": "/affected/1/versions"
},
{
"value": "2.42.1-6",
"evidence": "/affected/1/versions"
},
{
"value": "2.42~rc1-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.42~rc1-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.42~rc1-3",
"evidence": "/affected/1/versions"
},
{
"value": "2.42~rc2-1",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-53612",
"aliases": [
"DEBIAN-CVE-2026-53612"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.41.5-0+deb13u1"
}
]
}
],
"package": {
"name": "util-linux",
"purl": "pkg:deb/debian/util-linux?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.41-5",
"2.41.1-1",
"2.41.1-2",
"2.41.1-3",
"2.41.1-4",
"2.41.2-1",
"2.41.2-2",
"2.41.2-3",
"2.41.2-4",
"2.41.3-1",
"2.41.3-2",
"2.41.3-3",
"2.41.3-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53612.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.42.2-1"
}
]
}
],
"package": {
"name": "util-linux",
"purl": "pkg:deb/debian/util-linux?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.41-5",
"2.41.1-1",
"2.41.1-2",
"2.41.1-3",
"2.41.1-4",
"2.41.2-1",
"2.41.2-2",
"2.41.2-3",
"2.41.2-4",
"2.41.3-1",
"2.41.3-2",
"2.41.3-3",
"2.41.3-4",
"2.42-1",
"2.42-2",
"2.42-3",
"2.42-4",
"2.42-5",
"2.42-6",
"2.42.1-1",
"2.42.1-2",
"2.42.1-3",
"2.42.1-4",
"2.42.1-5",
"2.42.1-6",
"2.42~rc1-1",
"2.42~rc1-2",
"2.42~rc1-3",
"2.42~rc2-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-53612.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T17:47:49.102983690Z",
"provider": "osv",
"upstream": [
"CVE-2026-53612"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-53612"
]
},
"related_cves": [
{
"value": "CVE-2026-53612",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 419111,
"published_at": "2026-10-14T15:17:20.26+00:00"
}