CVE-2026-13595

Description

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.

CVSS breakdown

Affected products

• kernel / util-linux2.42.2
• RedHat / enterprise_linux7.0 – 7.0
• RedHat / enterprise_linux8.0 – 8.0
• RedHat / enterprise_linux9.0 – 9.0
• RedHat / enterprise_linux10.0 – 10.0
• RedHat / hardened_images
• RedHat / openshift_container_platform4.0 – 4.22.1

References

• VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:26573
• VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-13595
• MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2494101
• PATCHhttps://github.com/util-linux/util-linux/commit/c0186f14fbdb02f64c8e0ba701ce727ea764ff4c