CVE-2026-53615
util-linux libblkid DOS extended-partition overflow produces invalid partition metadata
- State
- Published
- Severity
- 8.0 High
- Published
- Oct 14, 2026
- Updated
- Oct 15, 2026
- Reserved
- Jun 9, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.0 High | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H | GitHub_M |
Weaknesses
- CWE-190 Integer Overflow or Wraparound
Affected Products
| Product | Versions |
|---|---|
util-linuxutil-linux |
|
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
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