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Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : util-linux vulnerabilities (USN-8702-1)

medium Nessus Plugin ID 365456

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8702-1 advisory.

 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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8702-1

Plugin Details

Severity: Medium

ID: 365456

File Name: ubuntu_USN-8702-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/13/2026

Updated: 10/13/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.52

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2026-3184

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:bsdextrautils, p-cpe:/a:canonical:ubuntu_linux:bsdutils, p-cpe:/a:canonical:ubuntu_linux:eject, p-cpe:/a:canonical:ubuntu_linux:fdisk, p-cpe:/a:canonical:ubuntu_linux:lastlog2, p-cpe:/a:canonical:ubuntu_linux:libblkid1, p-cpe:/a:canonical:ubuntu_linux:libfdisk1, p-cpe:/a:canonical:ubuntu_linux:liblastlog2-2, p-cpe:/a:canonical:ubuntu_linux:libmount1, p-cpe:/a:canonical:ubuntu_linux:libpam-lastlog2, p-cpe:/a:canonical:ubuntu_linux:libsmartcols1, p-cpe:/a:canonical:ubuntu_linux:libuuid1, p-cpe:/a:canonical:ubuntu_linux:login, p-cpe:/a:canonical:ubuntu_linux:mount, p-cpe:/a:canonical:ubuntu_linux:rfkill, p-cpe:/a:canonical:ubuntu_linux:util-linux-extra, p-cpe:/a:canonical:ubuntu_linux:util-linux-locales, p-cpe:/a:canonical:ubuntu_linux:util-linux, p-cpe:/a:canonical:ubuntu_linux:uuid-runtime

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/31/2026

Vulnerability Publication Date: 4/1/2026

Reference Information

CVE: CVE-2026-13595, CVE-2026-27456, CVE-2026-3184, CVE-2026-53612, CVE-2026-53613, CVE-2026-53614, CVE-2026-53615

IAVA: 2026-A-0384

USN: 8702-1