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.