CVE-2026-53615
Fixed in a distro release EPSS <1%CVSS 8.0
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.
Products: util-linux
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | util-linux | no fix |
| Debian 13 | util-linux | 2.41.5-0+deb13u1 |
| Debian 14 | util-linux | 2.42-1 |
| Ubuntu 14.04 LTS | util-linux | no fix |
| Ubuntu 18.04 LTS | util-linux | no fix |
| Ubuntu 22.04 LTS | util-linux | 2.37.2-4ubuntu3.6 |
| Ubuntu 24.04 LTS | util-linux | 2.39.3-9ubuntu6.6 |
| Ubuntu 25.10 | util-linux | no fix |
| Ubuntu 26.04 LTS | util-linux | 2.41.3-3ubuntu2.2 |
| Ubuntu 26.10 | util-linux | no fix |
| Ubuntu Pro 16.04 LTS | util-linux | no fix |
| Ubuntu Pro 20.04 LTS | util-linux | no fix |