{"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":"2026-10-15T02:47:31.801319243Z","published":"2026-10-14T15:56:45.310Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-190"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53615.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53615.json"},{"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"},{"type":"WEB","url":"https://github.com/util-linux/util-linux/releases/tag/v2.41.4"},{"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/util-linux/util-linux","events":[{"introduced":"0"},{"fixed":"e147e16fa9a9d3b3ad5968bf42280966ac3a8529"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"2.41.4"}]}}],"versions":["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":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53615.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H"}]}