Descriptionumount in util-linux 2.8 to 2.12q, 2.13-pre1, and 2.13-pre2, and other packages such as loop-aes-utils, allows local users with unmount permissions to gain privileges via the -r (remount) option, which causes the file system to be remounted with just the read-only flag, which effectively clears the nosuid, nodev, and other flags.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-823-1, DSA-825-1
Debian Bugs328141, 328626, 329063

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
util-linux (PTS)bullseye (security), bullseye2.36.1-8+deb11u2fixed
bookworm, bookworm (security)2.38.1-5+deb12u1fixed
sid, trixie2.40.2-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
util-linuxsource(unstable)2.12p-8medium328141, 329063

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