{"id":"CVE-2026-53613","revision":"d46c2f7a0f034b7b910a92ac84b57b8a","records":[{"revision":"d46c2f7a0f034b7b910a92ac84b57b8a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53613","aliases":[],"title":"util-linux mount target TOCTOU allows local privilege escalation","description":"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.","state":0,"publishedAt":"2026-10-14T14:52:56.063+00:00","modifiedAt":"2026-10-15T15:08:26.914+00:00","affected":[{"ecosystem":"Vendor product","name":"util-linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"util-linux\",\n                    \"product\": \"util-linux\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.17, <= 2.41.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2.42, <= 2.42.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7,"severity":"HIGH"}],"references":["https://github.com/util-linux/util-linux/security/advisories/GHSA-8gj5-72r3-428g","https://github.com/util-linux/util-linux/commit/0b010025a0e429bc80355c94db86a843395d49e2","https://github.com/util-linux/util-linux/commit/0d3d55975aa3492c62fd345eac38f41cd166c0b0","https://github.com/util-linux/util-linux/commit/2c773f336134acf016e639abb6f12ba7341fe4b8","https://github.com/util-linux/util-linux/commit/39fef62bf3226abb6bb018fa8750afa0327e84b4","https://github.com/util-linux/util-linux/commit/472cc3fb2d4d47cca7aab2e0b59eb3fb8a9359ec","https://github.com/util-linux/util-linux/commit/646fb66603d10a7ac337e14f566f1af48e3107c9","https://github.com/util-linux/util-linux/commit/708d1b3c51932dc5ba8082c7368187715e6a8d78","https://github.com/util-linux/util-linux/commit/78a860982e036f38fe9c0b3344998df5ac2c2ff5","https://github.com/util-linux/util-linux/commit/85d16b341f7232c9dbb4884b632e1e956584bee9","https://github.com/util-linux/util-linux/commit/a9508d216eb8977979102782672e0470cc9bf2a2","https://github.com/util-linux/util-linux/releases/tag/v2.41.5","https://github.com/util-linux/util-linux/releases/tag/v2.42.2","https://github.com/util-linux/util-linux/releases/tag/v2.42.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53613","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53613","identifiers":["CVE-2026-53613"]},"retained":false,"historicalAffected":[]}],"coverage":[]}