{"schema":"threatline.record/2","record":{"id":"CVE-2026-53612","aliases":["GHSA-g8wm-75wr-g2vh"],"summary":"util-linux mount hook_owner TOCTOU allows local privilege escalation","details":"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.","categories":["Unclassified"],"product":"util-linux","vendor":"util-linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-53612","source_modified_at":"2026-10-14T18:26:36.386Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"util-linux","vendor":"util-linux","versions":[{"version":">= 2.39, < 2.41.5","status":"affected"},{"version":">= 2.42, < 2.42.2","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00115,"percentile":0.01486,"score_date":"2026-10-23"},"published_at":"2026-10-14T14:47:25.523Z","modified_at":"2026-10-14T18:26:36.386Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-53612","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-14T18:26:36.386Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-53612","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/util-linux/util-linux/commit/24da33905c7115c4cbccd0afb2a469804e96467a","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/util-linux/util-linux/commit/722c96974dd4009a334e4aee556eedaab5fb94b4","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/util-linux/util-linux/commit/897a08c2b11dfa66975c3d24d63c7bf5f5be1a7c","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152cc","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/util-linux/util-linux/releases/tag/v2.41.5","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/util-linux/util-linux/releases/tag/v2.42.2","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"total","assessed_at":"2026-10-14T18:24:31.298549Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-14T18:26:36.386Z","content_hash":"7757eacb8e0b93056848f0af196db9bc810d23426b2404b54237eadf239f060d"}}