Medium 6.8Published Jun 29, 2026

CVE-2026-13595Util-linux: util-linux: heap use-after-free in libblkid nested partition probing

Updated under an hour ago (Oct 26, 2026, 7:10 PM ET)

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It affects Red Hat Hardened Images and 5 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Analyzed
Record last updated: Aug 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat Hardened Images redhat:hummingbird	from 2.42.2-1.hum1 not affected	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CNA record
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift	4	CNA record
redhat hardened_images redhat:hardened_images	all versions	NVD
redhat openshift_container_platform redhat:openshift_container_platform	from 4.0 through 4.22.1	NVD
redhat enterprise_linux redhat:enterprise_linux	7.0; 8.0; 9.0; 10.0	NVD
kernel util-linux kernel:util-linux	before 2.42.2	NVD

References

References

https://access.redhat.com/errata/RHSA-2026:26573	vendor-advisory, x-refsource-redhat
https://access.redhat.com/security/cve/CVE-2026-13595	vdb-entry, x-refsource-redhat, vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2494101	issue-tracking, x-refsource-redhat, vendor-advisory
https://github.com/util-linux/util-linux/commit/c0186f14fbdb02f64c8e0ba701ce727ea764ff4c	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.