CVE-2026-53615: high-severity vulnerability in util-linux
util-linux libblkid DOS extended-partition overflow produces invalid partition metadata
Published · Updated
18Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8
exploitation probability
—
observed exploitation
nono source reports it
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:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Affected products
util-linux · util-linuxRelated CVEs — util-linux
In the same product, most dangerous first.
CVE-2026-76642HIGHutil-linux libmount Privilege Escalation via Failed Mount HelperEPSS 0.2%CVE-2025-14104MEDIUMUtil-linux: util-linux: heap buffer overread in setpwnam() when processing 256-byte usernamesEPSS 0.2%CVE-2026-27456MEDIUMutil-linux: TOCTOU Race Condition in util-linux mount(8) - Loop Device SetupEPSS 0.1%CVE-2026-53614HIGHutil-linux LIBMOUNT_FORCE_MOUNT2 allows nosuid and noexec bypassEPSS —CVE-2026-53613HIGHutil-linux mount target TOCTOU allows local privilege escalationEPSS —CVE-2026-53612HIGHutil-linux mount hook_owner TOCTOU allows local privilege escalationEPSS —
References
https://github.com/util-linux/util-linux/commit/05c2dbadf34cc74192287f377904afaaf4061623https://github.com/util-linux/util-linux/commit/a2d858176b609ab5b8535021a3af9cd302d23d31https://github.com/util-linux/util-linux/commit/e9d544d013267ea86b70ee8ff78abd280e6641afhttps://github.com/util-linux/util-linux/releases/tag/v2.41.4https://github.com/util-linux/util-linux/security/advisories/GHSA-h4rw-gv36-wmp5