util-linux up to 2.41.3 libblkid dos.c parse_dos_extended integer overflow

Summaryinfo

A vulnerability labeled as very critical has been found in util-linux up to 2.41.3. This impacts the function parse_dos_extended of the file libblkid/src/partitions/dos.c of the component libblkid. The manipulation results in integer overflow. This vulnerability is identified as CVE-2026-53615. The attack is only possible with local access. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as very critical has been found in util-linux up to 2.41.3. Affected is the function parse_dos_extended of the file libblkid/src/partitions/dos.c of the component libblkid. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-53615 since 06/09/2026. The exploitability is told to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/14/2026).

Upgrading to version 2.41.4 eliminates this vulnerability.

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Productinfo

Name

• util-linux

Version

• 2.41.0
• 2.41.1
• 2.41.2
• 2.41.3

Website

• Product: https://github.com/util-linux/util-linux/

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