PT-2026-53234 · Util Linux · Libblkid

Published 2026-06-29 · Updated 2026-06-29 · CVE-2026-13595

Positive Technologies (AI Summary)

CVSS v3.1

6.8

Medium

Base vector

AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Name of the Vulnerable Software and Affected Versions util-linux libblkid (affected versions not specified)

Description A heap use-after-free read occurs in the libblkid library during nested partition probing. The BSD, Minix, Solaris x86, and UnixWare partition probers cache a raw pointer to a parent partition entry within a dynamically allocated array. If subsequent partition additions trigger a reallocation of this array, the cached pointer becomes stale. An attacker can trigger this issue without user interaction by providing a crafted block device image, such as through a USB drive or a loop-mounted disk image, because libblkid is automatically executed as root by udev/udisks during block-device hot-plug events. This may result in denial of service or limited information disclosure.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-13595

Affected Products

Libblkid

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-13595 · Security Note
• https://github.com/util-linux/util-linux/commit/c0186f14fbdb02f64c8e0ba701ce727ea764ff4c · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2494101 · Note
• https://access.redhat.com/security/cve/CVE-2026-13595 · Note
• https://twitter.com/VulmonFeeds/status/2071543683707486262 · Twitter Post