CVE-2026-53615util-linux libblkid DOS extended-partition overflow produces invalid partition metadata
Updated under an hour ago ()
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It affects util-linux. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.18%, higher than 7% of scored CVEs.
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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.
- CVSS
- 8.0 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
- Weakness (CWE)
- CWE-190
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.18% (percentile 7)
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
util-linux util-linux util_linux:util_linux (from the name) | before 2.41.4 | CNA record |
References
- https://github.com/util-linux/util-linux/security/advisories/GHSA-h4rw-gv36-wmp5x-refsource-confirm
- https://github.com/util-linux/util-linux/commit/05c2dbadf34cc74192287f377904afaaf4061623x-refsource-misc
- https://github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31x-refsource-misc
- https://github.com/util-linux/util-linux/commit/e9d544d013267ea86b70ee8ff78abd280e6641afx-refsource-misc
- https://github.com/util-linux/util-linux/releases/tag/v2.41.4x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.