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Vulnerability record · CVE-2026-13595 · published 29 June 2026

CVE-2026-13595: Redhat hardened images use after free vulnerability

Redhat · Hardened Images

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.

5.3 CVSS 3.1 Medium EPSS 0.17% · top 94.5% CWE-416 · Use after free
5.3CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
4References
31 Aug 2026Last modified by NVD

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:26573 Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-13595 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2494101 Issue TrackingVendor Advisory
https://github.com/util-linux/util-linux/commit/c0186f14fbdb02f64c8e0ba701ce727ea764ff4c Patch

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Source: NIST National Vulnerability Database (record CVE-2026-13595), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.