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Amazon Linux 2023 : polkit, polkit-devel, polkit-libs (ALAS2023-2026-3379)

low Nessus Plugin ID 377940

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-3379 advisory.

 A flaw was found in polkit. A regression in the fix for CVE-2026-4897 introduced a stack buffer underflow (out-of-bounds read) in the read_cookie() function of the polkit-agent-helper-1 setuid helper. When an empty cookie is read from standard input, the string-length computation underflows and one byte is read outside the bounds of the stack buffer. (CVE-2026-85498)

Tenable has extracted the preceding description block directly from the tested product 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

Run 'dnf update polkit --releasever 2023.12.20261109' or or 'dnf update --advisory ALAS2023-2026-3379 --releasever 2023.12.20261109' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-3379.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-85498.html

Plugin Details

Severity: Low

ID: 377940

File Name: al2023_ALAS2023-2026-3379.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 11/9/2026

Updated: 11/9/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Low

Base Score: 2.7

Temporal Score: 2

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

CVSS Score Source: CVE-2026-85498

CVSS v3

Risk Factor: Low

Base Score: 3.5

Temporal Score: 3.1

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:polkit-debuginfo, p-cpe:/a:amazon:linux:polkit-debugsource, p-cpe:/a:amazon:linux:polkit-devel, p-cpe:/a:amazon:linux:polkit-docs, p-cpe:/a:amazon:linux:polkit-libs-debuginfo, p-cpe:/a:amazon:linux:polkit-libs, p-cpe:/a:amazon:linux:polkit

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 11/9/2026

Vulnerability Publication Date: 10/29/2026

Reference Information

CVE: CVE-2026-85498