util-linux LIBMOUNT_FORCE_MOUNT2 allows nosuid and noexec bypass

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53614
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 16:17:45 UTC
Updated2026-10-16 16:00:33 UTC
Descriptionutil-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.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-269 | CWE-807 | CWE-269 CWE-269: Improper Privilege Management | CWE-807 CWE-807: Reliance on Untrusted Inputs in a Security Decision

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Util-linux Util-linux affected >= 2.39.1, < 2.41.5 Not specified
CNA Util-linux Util-linux affected >= 2.42, < 2.42.2 Not specified

References

ReferenceSourceLinkTags
github.com/util-linux/util-linux/releases/tag/v2.42.2 [email protected] github.com
github.com/util-linux/util-linux/commit/fd6b4d94ff013dc7ed680d4e864610da... [email protected] github.com
github.com/util-linux/util-linux/commit/9cbfb823500f510b34767edabd3ffd5b... [email protected] github.com
github.com/util-linux/util-linux/security/advisories/GHSA-67r7-8m5w-22wx [email protected] github.com
github.com/util-linux/util-linux/commit/53ff0fcdab12d69c60c971c69a3d0d17... [email protected] github.com
github.com/util-linux/util-linux/commit/31e37c1c7dcf25b76ccf41391fe934a7... [email protected] github.com
github.com/util-linux/util-linux/releases/tag/v2.41.5 [email protected] github.com
github.com/util-linux/util-linux/commit/cc81bbcec598cb91f0eb8456282f33ee... [email protected] github.com
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