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Vulnerability · Published Jun 29, 2026 · Assigned by redhat

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

Medium 6.8

In plain English

A medium-severity use-after-free in Red Hat Cost Management On-Premise 1 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.8Medium
Exploit odds (30 days)0.1%top 96.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10libblkid2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10libblkid-devel2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10libfdisk2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10libfdisk-devel2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10libmount2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10libmount-devel2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10libsmartcols2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10libsmartcols-devel2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10libuuid2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10libuuid-devel2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10python3-libmount2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10util-linux2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10util-linux-core2.40.2-18.el10_2.20ALSA-2026:93461
AlmaLinux:10uuidd2.40.2-18.el10_2.20ALSA-2026:93461
Debian:12util-linuxno fix listedDEBIAN-CVE-2026-13595
Debian:13util-linux2.41.5-0+deb13u1DEBIAN-CVE-2026-13595
Debian:14util-linux2.42.2-1DEBIAN-CVE-2026-13595
Rocky Linux:10util-linux0:2.40.2-18.el10_2.20RLSA-2026:93461
Ubuntu:22.04:LTSutil-linux2.37.2-4ubuntu3.6USN-8702-1
Ubuntu:22.04:LTSutil-linux2.37.2-4ubuntu3.6UBUNTU-CVE-2026-13595
Ubuntu:24.04:LTSutil-linux2.39.3-9ubuntu6.6USN-8702-1
Ubuntu:24.04:LTSutil-linux2.39.3-9ubuntu6.6UBUNTU-CVE-2026-13595
Ubuntu:25.10util-linuxno fix listedUBUNTU-CVE-2026-13595
Ubuntu:26.04:LTSutil-linux2.41.3-3ubuntu2.2UBUNTU-CVE-2026-13595
Ubuntu:26.04:LTSutil-linux2.41.3-3ubuntu2.2USN-8702-1
Ubuntu:26.10util-linuxno fix listedUBUNTU-CVE-2026-13595

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Cost Management On-Premise 1 see references
Red Hat Red Hat Hardened Images see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 5 see references

Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

References