{"id":"CVE-2026-53615","state":"PUBLISHED","title":"util-linux libblkid DOS extended-partition overflow produces invalid partition metadata","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.","publishedAt":"2026-10-14T15:56:45.310Z","updatedAt":"2026-10-15T15:07:57.462Z","severity":{"score":8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["util-linux util-linux"],"affected":[{"vendor":"util-linux","product":"util-linux","versions":[{"version":"< 2.41.4","status":"affected"}]}],"references":["https://github.com/util-linux/util-linux/security/advisories/GHSA-h4rw-gv36-wmp5","https://github.com/util-linux/util-linux/commit/05c2dbadf34cc74192287f377904afaaf4061623","https://github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31","https://github.com/util-linux/util-linux/commit/e9d544d013267ea86b70ee8ff78abd280e6641af","https://github.com/util-linux/util-linux/releases/tag/v2.41.4"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53615.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53615","state":"PUBLISHED","datePublished":"2026-10-14T15:56:45.310Z","dateUpdated":"2026-10-15T15:07:57.462Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-09T19:39:52.405Z"},"containers":{"cna":{"title":"util-linux libblkid DOS extended-partition overflow produces invalid partition metadata","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"util-linux","product":"util-linux","versions":[{"version":"< 2.41.4","status":"affected"}]}],"references":[{"url":"https://github.com/util-linux/util-linux/security/advisories/GHSA-h4rw-gv36-wmp5","name":"https://github.com/util-linux/util-linux/security/advisories/GHSA-h4rw-gv36-wmp5","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/util-linux/util-linux/commit/05c2dbadf34cc74192287f377904afaaf4061623","name":"https://github.com/util-linux/util-linux/commit/05c2dbadf34cc74192287f377904afaaf4061623","tags":["x_refsource_MISC"]},{"url":"https://github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31","name":"https://github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31","tags":["x_refsource_MISC"]},{"url":"https://github.com/util-linux/util-linux/commit/e9d544d013267ea86b70ee8ff78abd280e6641af","name":"https://github.com/util-linux/util-linux/commit/e9d544d013267ea86b70ee8ff78abd280e6641af","tags":["x_refsource_MISC"]},{"url":"https://github.com/util-linux/util-linux/releases/tag/v2.41.4","name":"https://github.com/util-linux/util-linux/releases/tag/v2.41.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":8,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"CWE-190: Integer Overflow or Wraparound","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-14T15:56:45.310Z"},"source":{"advisory":"GHSA-h4rw-gv36-wmp5","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-14T16:11:25.315520Z","id":"CVE-2026-53615","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-15T15:07:57.462Z"}}]}}}