{"id":"CVE-2026-53612","revision":"d146d811397f48c58f164ba29138a579","records":[{"revision":"d146d811397f48c58f164ba29138a579","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53612","aliases":[],"title":"util-linux mount hook_owner TOCTOU allows local privilege escalation","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.","state":0,"publishedAt":"2026-10-14T14:47:25.523+00:00","modifiedAt":"2026-10-14T18:26:36.386+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\": \">= 2.39, < 2.41.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2.42, < 2.42.2\",\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-g8wm-75wr-g2vh","https://github.com/util-linux/util-linux/commit/24da33905c7115c4cbccd0afb2a469804e96467a","https://github.com/util-linux/util-linux/commit/722c96974dd4009a334e4aee556eedaab5fb94b4","https://github.com/util-linux/util-linux/commit/897a08c2b11dfa66975c3d24d63c7bf5f5be1a7c","https://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152cc","https://github.com/util-linux/util-linux/releases/tag/v2.41.5","https://github.com/util-linux/util-linux/releases/tag/v2.42.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53612","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53612","identifiers":["CVE-2026-53612"]},"retained":false,"historicalAffected":[]}],"coverage":[]}