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CVE-2026-53612

Published: June 19, 2026Last modified: August 5, 2026

Description

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.

Severity score breakdown

ParameterValue
Base score7
Attack VectorLOCAL
Attack complexityHIGH
Privileges requiredLOW
User interactionNONE
ScopeUNCHANGED
ConfidentialityHIGH
Integrity impactHIGH
Availability impactHIGH
VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Status

ProductReleasePackageStatus
Alpaquita Linux23 LTSutil-linuxNot affected (2.38.1-r2)
25 LTSutil-linuxFixed (2.41.5-r0)
Streamutil-linuxFixed (2.42.2-r0)
Hardened Containers23 LTSutil-linuxNot affected (2.38.1-r2)
25 LTSutil-linuxFixed (2.41.5-r0)
Streamutil-linuxFixed (2.42.2-r0)

References

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