CVE-2026-76642

NameCVE-2026-76642
Descriptionutil-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
util-linux (PTS)bookworm2.38.1-5+deb12u3vulnerable
bookworm (security)2.38.1-5+deb12u1vulnerable
trixie (security), trixie2.41.5-0+deb13u1vulnerable
forky, sid2.42.3-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
util-linuxsource(unstable)2.42.3-1

Notes

[trixie] - util-linux <no-dsa> (Minor issue)
https://github.com/util-linux/util-linux/security/advisories/GHSA-m25x-3hj9-m26f
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