Integer overflow in Util-Linux
CVE-2026-53615
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.
Vulnerability class: Integer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Util-Linux — versions < 2.41.4
Weakness classification (CWE)
References
- github.com/util-linux/util-linux/security/advisories/GHSA-h4rw-gv36-wmp5
- github.com/util-linux/util-linux/commit/05c2dbadf34cc74192287f377904afaaf4061623
- github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31
- github.com/util-linux/util-linux/commit/e9d544d013267ea86b70ee8ff78abd280e6641af
- github.com/util-linux/util-linux/releases/tag/v2.41.4
Frequently asked questions
- What is CVE-2026-53615?
- CVE-2026-53615 is a high-severity vulnerability in Util-Linux, classified under Integer Overflow or Wraparound. CVSS score: 8.0/10. Published 2026-10-14.
- How severe is CVE-2026-53615?
- High severity. CVSS v3 base score is 8.0 out of 10.