What’s Vulnerable › Vulnerabilities

CVE-2026-53614: util-linux LIBMOUNT_FORCE_MOUNT2 allows nosuid and noexec bypass

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-16
• Weakness: CWE-269

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.

Affected products

• util-linux: from 2.39.1, < 2.41.5; from 2.42, < 2.42.2

References

• https://github.com/util-linux/util-linux/commit/31e37c1c7dcf25b76ccf41391fe934a75644c661
• https://github.com/util-linux/util-linux/commit/53ff0fcdab12d69c60c971c69a3d0d173fa46ca9
• https://github.com/util-linux/util-linux/commit/9cbfb823500f510b34767edabd3ffd5b436987b4
• https://github.com/util-linux/util-linux/commit/cc81bbcec598cb91f0eb8456282f33eed820ed5f
• https://github.com/util-linux/util-linux/commit/fd6b4d94ff013dc7ed680d4e864610da5b9751f1
• https://github.com/util-linux/util-linux/releases/tag/v2.41.5
• https://github.com/util-linux/util-linux/releases/tag/v2.42.2
• https://github.com/util-linux/util-linux/security/advisories/GHSA-67r7-8m5w-22wx

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