Use-After-Free Vulnerability in Util-Linux's Libblkid Library
CVE-2026-13595

6.8MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Vendor
CVE Published:
29 June 2026

What is CVE-2026-13595?

A vulnerability has been identified in the libblkid library of util-linux that allows for a use-after-free condition. This occurs during nested partition probing where a stale pointer to a parent partition entry is cached in a dynamically allocated array. If subsequent partition modifications lead to the reallocation of this array, attackers can exploit this flaw without user interaction. By presenting a specially crafted block device image, possibly through USB or loop-mounted disk images, attackers can trigger issues that may result in limited information disclosure or denial of service, as libblkid is called automatically by udev/udisks during block-device hot-plug events.

References

https://access.redhat.com/security/cve/CVE-2026-13595
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2494101
issue-trackingx_refsource_REDHAT
https://github.com/util-linux/util-linux/commit/c0186f14f...

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Thai Duong (Calif.io in collaboration with Claude and Anthropic Research) for reporting this issue.
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