CVE-2026-53613

Name	CVE-2026-53613
Description	util-linux is a random collection of Linux utilities. In util-linux 2.17 through 2.41.6 and 2.42 through 2.42.3, and in 2.42.4 when the legacy `mount(2)` path is used without `/proc`, restricted non-root `mount` requests validate an `/etc/fstab` target before the mount operation re-resolves that pathname. A local low-privileged user authorized by an fstab `user` or `users` entry whose target has an attacker-writable ancestor can use `renameat2(RENAME_EXCHANGE)` to swap a path component and redirect an authorized mount to a root-owned location, such as mounting attacker-controlled content over `/etc/sudoers.d`, and thereby gain root privileges. Versions 2.41.5 and 2.42.2 pin targets for the new mount API, and 2.42.4 pins legacy targets through `/proc/self/fd`; the documented legacy fallback without `/proc` remains affected.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-6442-1
Debian Bugs	1140195

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
util-linux (PTS)	bookworm	2.38.1-5+deb12u3	vulnerable
	bookworm (security)	2.38.1-5+deb12u1	vulnerable
	trixie (security), trixie	2.41.5-0+deb13u1	fixed
	forky, sid	2.42.4-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
util-linux	source	trixie	2.41.5-0+deb13u1		DSA-6442-1
util-linux	source	(unstable)	2.42.2-1			1140195

Notes

https://github.com/util-linux/util-linux/security/advisories/GHSA-8gj5-72r3-428g
Fixed by: https://github.com/util-linux/util-linux/commit/0d3d55975aa3492c62fd345eac38f41cd166c0b0 (v2.42.2)
Fixed by: https://github.com/util-linux/util-linux/commit/0b010025a0e429bc80355c94db86a843395d49e2 (v2.41.5)