Ubuntu alert USN-8702-1 (util-linux)

From:
             
 
noreply+usn-bot--- via ubuntu-security-announce <ubuntu-security-announce@lists.ubuntu.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8702-1] util-linux vulnerabilities
Date:
             
 
Mon, 31 Aug 2026 14:09:54 +0000
Message-ID:
             
 
<E1x12hu-0004oa-9U@lists.ubuntu.com>
Cc:
             
 
noreply+usn-bot@canonical.com
==========================================================================
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/2.41.3-3u...
  https://launchpad.net/ubuntu/+source/util-linux/2.39.3-9u...
  https://launchpad.net/ubuntu/+source/util-linux/2.37.2-4u...


Attachment: signature.asc (type=application/pgp-signature)
-----BEGIN PGP SIGNATURE-----
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=v1KQ
-----END PGP SIGNATURE-----