Home / mailings [USN-8702-1] util-linux vulnerabilities
Posted on 31 August 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8702-1
August 31, 2026
util-linux vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
Summary:
Several security issues were fixed in util-linux.
Software Description:
- util-linux: miscellaneous system utilities
Details:
It was discovered that libblkid in util-linux had a heap use-after-free
vulnerability during nested partition probing. An attacker who could
present a crafted block device image could possibly use this issue to
obtain sensitive information or cause a denial of service. (CVE-2026-13595)
It was discovered that the mount utility in util-linux had a time-of-check-
time-of-use vulnerability when setting up loop devices. A local attacker
could possibly use this issue to obtain unauthorized read access to root-
protected files and block devices. (CVE-2026-27456)
It was discovered that the login utility in util-linux improperly
canonicalized hostnames when invoked with the -h option. A remote attacker
could possibly use this issue to bypass host-based access control rules.
This issue only affected Ubuntu 26.04 LTS. (CVE-2026-3184)
It was discovered that libmount in util-linux had a time-of-check-time-of-
use vulnerability in its ownership hook. A local attacker could possibly
use this issue to gain elevated privileges. This issue only affected Ubuntu
24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-53612)
It was discovered that libmount in util-linux had a time-of-check-time-of-
use vulnerability that allowed target path redirection during mount
operations. A local attacker could possibly use this issue to gain elevated
privileges. (CVE-2026-53613)
It was discovered that libmount in util-linux improperly handled the
LIBMOUNT_FORCE_MOUNT2 environment variable in the SUID mount utility. A
local attacker could possibly use this issue to bypass nosuid and noexec
mount options and gain elevated privileges. This issue only affected Ubuntu
24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-53614)
It was discovered that libblkid in util-linux had an integer overflow
vulnerability when parsing DOS partition tables. An attacker who could
present a crafted block device image could possibly use this issue to cause
a denial of service. (CVE-2026-53615)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 26.04 LTS
util-linux 2.41.3-3ubuntu2.2
Ubuntu 24.04 LTS
util-linux 2.39.3-9ubuntu6.6
Ubuntu 22.04 LTS
util-linux 2.37.2-4ubuntu3.6
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8702-1
CVE-2026-13595, CVE-2026-27456, CVE-2026-3184, CVE-2026-53612,
CVE-2026-53613, CVE-2026-53614, CVE-2026-53615
Package Information:
https://launchpad.net/ubuntu/+source/util-linux/2.41.3-3ubuntu2.2
https://launchpad.net/ubuntu/+source/util-linux/2.39.3-9ubuntu6.6
https://launchpad.net/ubuntu/+source/util-linux/2.37.2-4ubuntu3.6
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