{"schemaVersion":3,"id":"CVE-2026-53613","aliases":["UBUNTU-CVE-2026-53613","DEBIAN-CVE-2026-53613","ALPINE-CVE-2026-53613"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-10-14T14:52:56.063Z","modified":"2026-10-15T15:08:26.914Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7,"severity":"high","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7,"severity":"high","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7,"severity":"high","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":2.6,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Alpine","score":7,"severity":"high","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":2.6,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7,"severity":"high","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":2.6,"impact":9.8,"computed":true}]},"epss":{"probability":0.00128,"percentile":0.02179,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-15T00:00:00.000Z","score":0.00128,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00128,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00128,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00128,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00128,"percentile":0.02179}],"last30":[{"date":"2026-10-15T00:00:00.000Z","score":0.00128,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00128,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00128,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00128,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00128,"percentile":0.02179}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-367","name":"Time-of-check Time-of-use (TOCTOU) Race Condition","description":"The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/367.html"}],"affected":[{"vendor":"alpine","product":"util-linux","name":"util-linux","label":"util-linux","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/util-linux","purlType":"apk","versions":[{"text":"< 2.41.6-r0","noFixRecorded":false,"fixedIn":null},{"text":"< 2.42.3-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.41.6-r0 | < 2.42.3-r0","eol":null,"hubHref":null},{"vendor":"debian","product":"util-linux","name":"util-linux","label":"util-linux","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/util-linux","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2.41.5-0+deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.42.2-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2.41.5-0+deb13u1 | < 2.42.2-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"util-linux","name":"util-linux","label":"util-linux","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/util-linux","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2.37.2-4ubuntu3.6","noFixRecorded":false,"fixedIn":null},{"text":"< 2.39.3-9ubuntu6.6","noFixRecorded":false,"fixedIn":null},{"text":"< 2.41.3-3ubuntu2.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2.37.2-4ubuntu3.6 | < 2.39.3-9ubuntu6.6 | < 2.41.3-3ubuntu2.2","eol":null,"hubHref":null},{"vendor":"util-linux","product":"util-linux","name":"util-linux","label":"util-linux","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2.17, ≤ 2.41.6","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.42, ≤ 2.42.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.17, ≤ 2.41.6 | ≥ 2.42, ≤ 2.42.4","eol":null,"hubHref":"/vendor/util-linux/util-linux"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/CVE-2026-53613","label":"ubuntu.com/security/CVE-2026-53613","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53613","label":"www.cve.org/CVERecord?id=CVE-2026-53613","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://github.com/util-linux/util-linux/security/advisories/GHSA-8gj5-72r3-428g","label":"github.com/util-linux/util-linux/security/advisories/GHSA-8gj5-72r3-428g","hostname":"github.com","tags":["REPORT","X Refsource CONFIRM"]},{"url":"https://ubuntu.com/security/notices/USN-8702-1","label":"ubuntu.com/security/notices/USN-8702-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-53613","label":"security-tracker.debian.org/tracker/CVE-2026-53613","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://github.com/util-linux/util-linux/commit/0b010025a0e429bc80355c94db86a843395d49e2","label":"github.com/util-linux/util-linux/commit/0b010025a0e429bc80355c94db86a843395d49e2","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/util-linux/util-linux/commit/0d3d55975aa3492c62fd345eac38f41cd166c0b0","label":"github.com/util-linux/util-linux/commit/0d3d55975aa3492c62fd345eac38f41cd166c0b0","hostname":"github.com","tags":["X Refsource 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MISC"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-53613","label":"security.alpinelinux.org/vuln/CVE-2026-53613","hostname":"security.alpinelinux.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:11408-1","OPENSUSE-SU-2026:21905-1","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","USN-8702-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:11408-1","OPENSUSE-SU-2026:21905-1","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","USN-8702-1"]},"timeline":[{"kind":"published","date":"2026-10-14T14:52:56.063Z","label":"Published","detail":"Vulnerability first 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