CVE-2026-53615
util-linux libblkid DOS extended-partition overflow produces invalid partition metadata
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High8.0 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High8.0 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.0.
Weakness
Affected products
- affected < 2.41.4
References (5)
- https://github.com/util-linux/util-linux/security/advisories/GHSA-h4rw-gv36-wmp5 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/util-linux/util-linux/commit/05c2dbadf34cc74192287f377904afaaf4061623 (opens in a new tab)x_refsource_MISC
- https://github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31 (opens in a new tab)x_refsource_MISC
- https://github.com/util-linux/util-linux/commit/e9d544d013267ea86b70ee8ff78abd280e6641af (opens in a new tab)x_refsource_MISC
- https://github.com/util-linux/util-linux/releases/tag/v2.41.4 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-53615)Record last updated .