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Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS / Pro Realtime 24.04 LTS : polkit vulnerability (USN-8762-1)

high Nessus Plugin ID 346234

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS / Pro Realtime 24.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8762-1 advisory.

 It was discovered that polkit incorrectly handled cookie input. A local attacker could possibly use this issue to cause polkit to crash, resulting in a denial of service, or execute arbitrary code.

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

Note that Nessus has not tested for this issue 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-8762-1

Plugin Details

Severity: High

ID: 346234

File Name: ubuntu_USN-8762-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/16/2026

Updated: 9/16/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.22

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-85498

CVSS v3

Risk Factor: High

Base Score: 8.4

Temporal Score: 7.3

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

Temporal Vector: CVSS:3.0/E:U/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, cpe:/o:canonical:ubuntu_linux:pro:-:lts, p-cpe:/a:canonical:ubuntu_linux:gir1.2-polkit-1.0, p-cpe:/a:canonical:ubuntu_linux:libpolkit-agent-1-0, p-cpe:/a:canonical:ubuntu_linux:libpolkit-gobject-1-0, p-cpe:/a:canonical:ubuntu_linux:pkexec, p-cpe:/a:canonical:ubuntu_linux:policykit-1, p-cpe:/a:canonical:ubuntu_linux:polkitd-pkla, p-cpe:/a:canonical:ubuntu_linux:polkitd

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/15/2026

Vulnerability Publication Date: 9/15/2026

Reference Information

CVE: CVE-2026-85498

USN: 8762-1