DescriptionA logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users' filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, 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)buster2.33.1-0.1fixed
bullseye (security), bullseye2.36.1-8+deb11u1fixed
sid, trixie2.39.2-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
util-linuxsourcestretch(not affected)
util-linuxsourcebuster(not affected)


[buster] - util-linux <not-affected> (Vulnerable code introduced later)
[stretch] - util-linux <not-affected> (Vulnerable code introduced later)
Introduced by: (v2.34-rc1)
Fixed by: (v2.37.3)

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