{"id":"CVE-2026-53613","summary":"util-linux mount target TOCTOU allows local privilege escalation","details":"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.","aliases":["GHSA-8gj5-72r3-428g"],"modified":"2026-10-15T02:47:39.870237704Z","published":"2026-10-14T14:52:56.063Z","related":["SUSE-SU-2026:23250-1","SUSE-SU-2026:23255-1","SUSE-SU-2026:23861-1","SUSE-SU-2026:23870-1","SUSE-SU-2026:23884-1","SUSE-SU-2026:3684-1","SUSE-SU-2026:3685-1","SUSE-SU-2026:3812-1","SUSE-SU-2026:3813-1","SUSE-SU-2026:4296-1","openSUSE-SU-2026:11408-1","openSUSE-SU-2026:21905-1"],"database_specific":{"cwe_ids":["CWE-367"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53613.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53613.json"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/0b010025a0e429bc80355c94db86a843395d49e2"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/0d3d55975aa3492c62fd345eac38f41cd166c0b0"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/2c773f336134acf016e639abb6f12ba7341fe4b8"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/39fef62bf3226abb6bb018fa8750afa0327e84b4"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/472cc3fb2d4d47cca7aab2e0b59eb3fb8a9359ec"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/646fb66603d10a7ac337e14f566f1af48e3107c9"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/708d1b3c51932dc5ba8082c7368187715e6a8d78"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/78a860982e036f38fe9c0b3344998df5ac2c2ff5"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/85d16b341f7232c9dbb4884b632e1e956584bee9"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/a9508d216eb8977979102782672e0470cc9bf2a2"},{"type":"WEB","url":"https://github.com/util-linux/util-linux/releases/tag/v2.41.5"},{"type":"WEB","url":"https://github.com/util-linux/util-linux/releases/tag/v2.42.2"},{"type":"WEB","url":"https://github.com/util-linux/util-linux/releases/tag/v2.42.4"},{"type":"ADVISORY","url":"https://github.com/util-linux/util-linux/security/advisories/GHSA-8gj5-72r3-428g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53613"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/util-linux/util-linux","events":[{"introduced":"36b00d61a79198997acc711345a291cc3a333af3"},{"last_affected":"02822c9374fc72d38baf8a1f859eb0813970bf3f"},{"introduced":"0a7dfc376192e8fb1e7bdb2d0c90d8b9b173a42b"},{"last_affected":"d76cbf8f13e65ff657344f7f6a90042cf755ba59"}],"database_specific":{"extracted_events":[{"introduced":"2.17"},{"last_affected":"2.41.6"},{"introduced":"2.42"},{"last_affected":"2.42.4"}],"source":"AFFECTED_FIELD"}}],"versions":["v2.42.4","v2.41.6","v2.42.3","v2.42.2","v2.41.5","v2.41.4","v2.42.1","v2.42","v2.42-rc2","v2.42-rc1","v2.41.3","v2.41.2","v2.41.2-rc1","v2.41.1","v2.41","v2.41-rc2","v2.41-rc1","v2.42-start"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53613.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}