Integer Overflow or Wraparound Affecting libblkid package, versions <0:2.30.2-2.amzn2.0.14


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.18% (7th percentile)

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  • Snyk IDSNYK-AMZN2-LIBBLKID-17883930
  • published8 Jul 2026
  • disclosed14 Oct 2026

Introduced: 8 Jul 2026

CVE-2026-53615  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 libblkid to version 0:2.30.2-2.amzn2.0.14 or higher.
This issue was patched in ALAS2-2026-3789.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libblkid package and not the libblkid package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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 Base Scores

version 3.1