Description
util-linux is a random collection of Linux utilities. In util-linux 2.39.1 through 2.41.4 and 2.42 through 2.42.1, the SUID `mount` utility reads the attacker-controlled `LIBMOUNT_FORCE_MOUNT2` environment variable with `getenv()`, allowing a local low-privileged user to force the non-atomic legacy bind-mount path. With an `/etc/fstab` bind mount authorized by `user` or `users` and protected by `nosuid`, `noexec`, or `nodev`, an attacker can race the window between the initial bind mount and the remount that applies those security flags and execute a SUID program from the temporarily unprotected mount, potentially gaining root privileges. This issue is fixed in 2.41.5 and 2.42.2.
References8
- github.com/util-linux/util-linux/commit/31e37c1c7dcf25b76ccf413…
- github.com/util-linux/util-linux/commit/53ff0fcdab12d69c60c971c…
- github.com/util-linux/util-linux/commit/9cbfb823500f510b34767ed…
- github.com/util-linux/util-linux/commit/cc81bbcec598cb91f0eb845…
- github.com/util-linux/util-linux/commit/fd6b4d94ff013dc7ed680d4…
- github.com/util-linux/util-linux/releases/tag/v2.41.5
- github.com/util-linux/util-linux/releases/tag/v2.42.2
- github.com/util-linux/util-linux/security/advisories/GHSA-67r7-…
Metrics
- CVSS 3.1
-
7.0
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 11 November 2026
- CWE
- CWE-269CWE-807
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.