{"id":"CVE-2026-53615","summary":"util-linux libblkid DOS extended-partition overflow produces invalid partition metadata","details":"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.","aliases":["GHSA-h4rw-gv36-wmp5"],"modified":"2026-10-24T07:14:23.679389485Z","published":"2026-10-14T15:56:45.310Z","database_specific":{"cwe_ids":["CWE-190"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53615.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/util-linux/util-linux/releases/tag/v2.41.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53615.json"},{"type":"ADVISORY","url":"https://github.com/util-linux/util-linux/security/advisories/GHSA-h4rw-gv36-wmp5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53615"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/05c2dbadf34cc74192287f377904afaaf4061623"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31"},{"type":"FIX","url":"https://github.com/util-linux/util-linux/commit/e9d544d013267ea86b70ee8ff78abd280e6641af"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/util-linux/util-linux","events":[{"introduced":"0"},{"fixed":"e147e16fa9a9d3b3ad5968bf42280966ac3a8529"},{"fixed":"05c2dbadf34cc74192287f377904afaaf4061623"},{"fixed":"a2d858176b609ab5b8535021a3af9cd302d23d31"},{"fixed":"e9d544d013267ea86b70ee8ff78abd280e6641af"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StringRangeExpression","range":[{"introduced":"0"},{"fixed":"2.41.4"}]},{"range":[{"fixed":"05c2dbadf34cc74192287f377904afaaf4061623"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"a2d858176b609ab5b8535021a3af9cd302d23d31"}],"source":"REFERENCES_COMMIT"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"e9d544d013267ea86b70ee8ff78abd280e6641af"}]},{"source":"REFERENCES_TAG","original_tag":"v2.41.4","range":[{"fixed":"e147e16fa9a9d3b3ad5968bf42280966ac3a8529"}]}]}}],"versions":["v2.42-rc2","v2.42-rc1","v2.43-devel","v2.41.3","v2.41.2","v2.41.2-rc1","v2.41.1","v2.41","v2.41-rc2","v2.41-rc1","v2.42-start","v2.41-start","v2.41-devel","v2.40-rc1","v2.39","v2.39-rc3","v2.39-rc2","v2.39-rc1","v2.38","v2.38-rc4","v2.38-rc3","v2.38-rc2","v2.38-rc1","v2.37","v2.37-rc2","v2.37-rc1","v2.36","v2.36-rc2","v2.36-rc1","v2.35","v2.35-rc2","v2.35-rc1","v2.34","v2.34-rc2","v2.34-rc1","v2.33","v2.33-rc2","v2.33-rc1","v2.32","v2.32-rc2","v2.32-rc1","v2.31","v2.31-rc2","v2.31-rc1","v2.30","v2.30-rc2","v2.30-rc1","v2.29","v2.29-rc2","v2.29-rc1","v2.28","v2.28-rc2","v2.28-rc1","v2.27","v2.27-rc2","v2.27-rc1","v2.26","v2.26-rc2","v2.26-rc1","v2.25","v2.25-rc2","v2.25-rc1","v2.24","v2.24-rc2","v2.24-rc1","v2.23","v2.23-rc2","v2.23-rc1","v2.22","v2.22-rc2","v2.22-rc1","v2.21","v2.21-rc2","v2.21-rc1","v2.20","v2.20-rc2","v2.20-rc1","v2.19","v2.19-rc3","v2.19-rc2","v2.19-rc1","v2.18","v2.18-rc2","v2.18-rc1","v2.17","v2.17-rc3","v2.17-rc2","v2.17-rc1","v2.16","v2.16-rc2","v2.16-rc1","v2.15","v2.15-rc2","v2.15-rc1","v2.14","v2.14-rc3","v2.14-rc2","v2.14-rc1","v2.13","v2.13-rc3","v2.13-rc2","v2.13-rc1","v2.13-pre7","v2.13-pre6","v2.13-pre5","v2.13-pre4","v2.13-pre3","v2.13-pre2","v2.13-pre1","v2.12r","v2.12r-pre1","v2.12q","v2.12q-pre2","v2.12q-pre1","v2.12p","v2.12o","v2.12m","v2.12l","v2.12k","v2.12j","v2.12i","v2.12h","v2.12d","v2.12b","v2.12a","v2.12pre","v2.12","v2.11y","v2.11x","v2.11w","v2.11v","v2.11u","v2.11t","v2.11r","v2.11q","v2.11o","v2.11n","v2.11m","v2.11f","v2.11b","v2.10s","v2.10m","v2.10f","v2.9v","v2.9i","v2.8","v2.7.1","v2.5","v2.2"],"database_specific":{"vanir_signatures_modified":"2026-10-24T07:14:23Z","source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53615.json","vanir_signatures":[{"source":"https://github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31","target":{"file":"libblkid/src/partitions/dos.c"},"deprecated":false,"digest":{"line_hashes":["232188634058807828779057059403469247448","70466878734578854819337285162928119237","12127014053691630507800809837596363993","246658466275593735812956361149173527389","208145013997725831697501870176785482752","223571753179035212784033631977759558456","270618350032974213860319972064237169967","226651027769641349304244070274927766503","127072203412964676947313090807080614875","298300707158360322429833028291571910084","8900694878996008994894889509917005861","309495658445159413759017149043557768206","169167973510238484935507632255356739538","287458034198504161367057492451891252058","215205945271706971830328945967132849904","193878910767809111826974975463905601634","261592804064773474719635147527287372065","251072616635051034327411479825206640122","233274861652759076313885017644261902543","8727937234800851335594727418830849408","128928505958998832005259895431469029396","84106720505027400928086879024173101100","216357512868087013091475894786896598578","253454072026116570950456263265701217087","238564631418329027799462079889976920782","204216076673294872027690438871378943726"],"threshold":0.9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