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Amazon Linux 2023 : firewalld, firewalld-filesystem, firewalld-test (ALAS2023-2026-1636)

medium Nessus Plugin ID 315621

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Synopsis

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

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1636 advisory.

 A flaw was found in firewalld. A local unprivileged user can exploit this vulnerability by mis-authorizing two runtime D-Bus (Desktop Bus) setters, setZoneSettings2 and setPolicySettings. This mis-authorization allows the user to modify the runtime firewall state without proper authentication, leading to unauthorized changes in network security configurations. (CVE-2026-4948)

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 firewalld --releasever 2023.11.20260511' or or 'dnf update --advisory ALAS2023-2026-1636 --releasever 2023.11.20260511' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1636.html

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

https://explore.alas.aws.amazon.com/CVE-2026-4948.html

Plugin Details

Severity: Medium

ID: 315621

File Name: al2023_ALAS2023-2026-1636.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 5/20/2026

Updated: 5/20/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-4948

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:firewalld, p-cpe:/a:amazon:linux:firewalld-filesystem, p-cpe:/a:amazon:linux:firewalld-test, p-cpe:/a:amazon:linux:python3-firewall

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/14/2026

Vulnerability Publication Date: 3/27/2026

Reference Information

CVE: CVE-2026-4948