CVE-2026-13595: Kernel Util-Linux

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in the libblkid library of util-linux. During nested partition probing, the BSD, Minix, Solaris x86, and UnixWare partition probers cache a raw pointer to a parent partition entry in a dynamically allocated array. When subsequent partition additions cause the array to be reallocated, this pointer becomes stale, leading to a heap use-after-free read. An attacker who can present a crafted block device image (for example, via USB insertion or a loop-mounted disk image) can trigger this flaw without user interaction, as libblkid is invoked automatically by udev/udisks as root on block-device hot-plug events. This could lead to limited information disclosure or denial of service.

Affected products

• Kernel Util-Linux: before 2.42.2 (fixed in 2.42.2)
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only
• Red Hat Hardened Images: affected versions not specified
• Red Hat Openshift Container Platform: from 4.0, up to and including 4.22.1

Published 2026-06-29. Last modified 2026-08-31.