{"schemaVersion":3,"id":"CVE-2026-53615","aliases":["UBUNTU-CVE-2026-53615","DEBIAN-CVE-2026-53615"],"status":"published","duplicateOf":null,"title":null,"description":"util-linux is a random collection of Linux utilities. Before util-linux 2.41.4, `parse_dos_extended()` in `libblkid/src/partitions/dos.c` computes an extended-partition start sector with 32-bit addition and does not apply the extended-area bounds checks to the first two EBR entries. A local attacker who causes a crafted DOS extended-partition disk image or removable medium to be probed can wrap `cur_start + start` to sector zero and cause libblkid to report a false partition overlapping the MBR. This directly compromises the integrity of the reported partition metadata; disk modification or availability loss requires a separate downstream consumer to act on that metadata. This issue is fixed in 2.41.4.","dates":{"published":"2026-10-14T15:56:45.310Z","modified":"2026-10-15T15:07:57.462Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","exploitability":6.4,"impact":9.2,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","exploitability":6.4,"impact":9.2,"computed":true}]},"epss":{"probability":0.00178,"percentile":0.06895,"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":0.00178,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00178,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00178,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00178,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00178,"percentile":0.06895}],"last30":[{"date":"2026-10-15T00:00:00.000Z","score":0.00178,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00178,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00178,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00178,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00178,"percentile":0.06895}]},"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-190","name":"Integer Overflow or Wraparound","description":"The product performs a calculation that can\n         produce an integer overflow or wraparound when the logic\n         assumes that the resulting value will always be larger than\n         the original value. This occurs when an integer value is\n         incremented to a value that is too large to store in the\n         associated representation. When this occurs, the value may\n         become a very small or negative number.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/190.html"}],"affected":[{"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":"< 2.42-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2.41.5-0+deb13u1 | < 2.42-1","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":"< 2.41.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.41.4","eol":null,"hubHref":"/vendor/util-linux/util-linux"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/CVE-2026-53615","label":"ubuntu.com/security/CVE-2026-53615","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53615","label":"www.cve.org/CVERecord?id=CVE-2026-53615","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://github.com/util-linux/util-linux/security/advisories/GHSA-h4rw-gv36-wmp5","label":"github.com/util-linux/util-linux/security/advisories/GHSA-h4rw-gv36-wmp5","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-2026-53615","label":"security-tracker.debian.org/tracker/CVE-2026-53615","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://github.com/util-linux/util-linux/commit/05c2dbadf34cc74192287f377904afaaf4061623","label":"github.com/util-linux/util-linux/commit/05c2dbadf34cc74192287f377904afaaf4061623","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31","label":"github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/util-linux/util-linux/commit/e9d544d013267ea86b70ee8ff78abd280e6641af","label":"github.com/util-linux/util-linux/commit/e9d544d013267ea86b70ee8ff78abd280e6641af","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/util-linux/util-linux/releases/tag/v2.41.4","label":"github.com/util-linux/util-linux/releases/tag/v2.41.4","hostname":"github.com","tags":["X Refsource MISC"]}],"lineage":{"upstream":[],"downstream":["USN-8702-1"],"duplicates":[],"related":["USN-8702-1"]},"timeline":[{"kind":"published","date":"2026-10-14T15:56:45.310Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-15T15:07:57.462Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":32,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T07:15:17.984Z","stale":false,"partial":false}}