{"schemaVersion":3,"id":"CVE-2026-53612","aliases":["UBUNTU-CVE-2026-53612","DEBIAN-CVE-2026-53612","ALPINE-CVE-2026-53612"],"status":"published","duplicateOf":null,"title":null,"description":"util-linux is a random collection of Linux utilities. In util-linux 2.39 through 2.41.4 and 2.42 through 2.42.1, the SUID `mount` utility's `hook_owner.c` post-mount hook performs path-based `chmod()` and `lchown()` operations on a previously validated mount target. A local low-privileged user authorized by an `/etc/fstab` entry with `user` or `users` and an `X-mount.mode`, `X-mount.owner`, or `X-mount.group` option can use `renameat2(RENAME_EXCHANGE)` to race a writable ancestor of the target and redirect the privileged ownership or mode change to a root-owned path, potentially gaining root privileges. This issue is fixed in 2.41.5 and 2.42.2.","dates":{"published":"2026-10-14T14:47:25.523Z","modified":"2026-10-14T18:26:36.386Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7,"severity":"high","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7,"severity":"high","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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2.41.5-0+deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.42.2-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.41.5-0+deb13u1 | < 2.42.2-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"util-linux","name":"util-linux","label":"util-linux","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/util-linux","purlType":"deb","versions":[{"text":"< 2.39.3-9ubuntu6.6","noFixRecorded":false,"fixedIn":null},{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2.41.3-3ubuntu2.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.39.3-9ubuntu6.6 | All versions (No fix recorded) | < 2.41.3-3ubuntu2.2","eol":null,"hubHref":null},{"vendor":"util-linux","product":"util-linux","name":"util-linux","label":"util-linux","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2.39, < 2.41.5","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.42, < 2.42.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.39, < 2.41.5 | ≥ 2.42, < 2.42.2","eol":null,"hubHref":"/vendor/util-linux/util-linux"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/CVE-2026-53612","label":"ubuntu.com/security/CVE-2026-53612","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53612","label":"www.cve.org/CVERecord?id=CVE-2026-53612","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh","label":"github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh","hostname":"github.com","tags":["REPORT","X Refsource 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