{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53612", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-09T19:39:52.405Z", "datePublished": "2026-10-14T14:47:25.523Z", "dateUpdated": "2026-10-14T18:26:36.386Z"}, "containers": {"cna": {"title": "util-linux mount hook_owner TOCTOU allows local privilege escalation", "problemTypes": [{"descriptions": [{"cweId": "CWE-367", "lang": "en", "description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh"}, {"name": "https://github.com/util-linux/util-linux/commit/24da33905c7115c4cbccd0afb2a469804e96467a", "tags": ["x_refsource_MISC"], "url": "https://github.com/util-linux/util-linux/commit/24da33905c7115c4cbccd0afb2a469804e96467a"}, {"name": "https://github.com/util-linux/util-linux/commit/722c96974dd4009a334e4aee556eedaab5fb94b4", "tags": ["x_refsource_MISC"], "url": "https://github.com/util-linux/util-linux/commit/722c96974dd4009a334e4aee556eedaab5fb94b4"}, {"name": "https://github.com/util-linux/util-linux/commit/897a08c2b11dfa66975c3d24d63c7bf5f5be1a7c", "tags": ["x_refsource_MISC"], "url": "https://github.com/util-linux/util-linux/commit/897a08c2b11dfa66975c3d24d63c7bf5f5be1a7c"}, {"name": "https://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152cc", "tags": ["x_refsource_MISC"], "url": "https://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152cc"}, {"name": "https://github.com/util-linux/util-linux/releases/tag/v2.41.5", "tags": ["x_refsource_MISC"], "url": "https://github.com/util-linux/util-linux/releases/tag/v2.41.5"}, {"name": "https://github.com/util-linux/util-linux/releases/tag/v2.42.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/util-linux/util-linux/releases/tag/v2.42.2"}], "affected": [{"vendor": "util-linux", "product": "util-linux", "versions": [{"version": ">= 2.39, < 2.41.5", "status": "affected"}, {"version": ">= 2.42, < 2.42.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-14T14:47:25.523Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-g8wm-75wr-g2vh", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-14T18:24:31.298549Z", "id": "CVE-2026-53612", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-14T18:26:36.386Z"}}]}}

{}

{"affected": [{"affectedData": [{"product": "util-linux", "vendor": "util-linux", "versions": [{"status": "affected", "version": ">= 2.39, < 2.41.5"}, {"status": "affected", "version": ">= 2.42, < 2.42.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-53612", "lastModified": "2026-10-14T19:17:17.210", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53612", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-14T18:24:31.298549Z", "version": "2.0.3"}}]}, "published": "2026-10-14T15:17:20.260", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/util-linux/util-linux/commit/24da33905c7115c4cbccd0afb2a469804e96467a"}, {"source": "security-advisories@github.com", "url": "https://github.com/util-linux/util-linux/commit/722c96974dd4009a334e4aee556eedaab5fb94b4"}, {"source": "security-advisories@github.com", "url": "https://github.com/util-linux/util-linux/commit/897a08c2b11dfa66975c3d24d63c7bf5f5be1a7c"}, {"source": "security-advisories@github.com", "url": "https://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152cc"}, {"source": "security-advisories@github.com", "url": "https://github.com/util-linux/util-linux/releases/tag/v2.41.5"}, {"source": "security-advisories@github.com", "url": "https://github.com/util-linux/util-linux/releases/tag/v2.42.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-367"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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