CVE-2026-53612

Name	CVE-2026-53612
Description	Local Privilege Escalation via TOCTOU in mount(8) hook_owner.c chmod/chown
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)
Debian Bugs	1140194

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
util-linux (PTS)	bullseye (security), bullseye	2.36.1-8+deb11u2	fixed
	bookworm	2.38.1-5+deb12u3	fixed
	bookworm (security)	2.38.1-5+deb12u1	fixed
	trixie	2.41-5	vulnerable
	forky	2.42.1-3	vulnerable
	sid	2.42.1-6	vulnerable

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

Package	Type	Release	Fixed Version	Debian Bugs
util-linux	source	bullseye	(not affected)
util-linux	source	bookworm	(not affected)
util-linux	source	(unstable)	(unfixed)	1140194

Notes

[bookworm] - util-linux <not-affected> (Vulnerable code introduced later)
[bullseye] - util-linux <not-affected> (Vulnerable code introduced later)
https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh
Fixed by: https://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152cc (v2.42.2)