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Amazon Linux 2023 : alsa-lib, alsa-lib-devel, alsa-topology (ALAS2023-2026-1426)

medium Nessus Plugin ID 299520

Synopsis

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

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1426 advisory.

 alsa-lib versions 1.2.2 up to and including 1.2.15.2, prior to commit 5f7fe33, contain a heap-based buffer overflow in the topology mixer control decoder. The tplg_decode_control_mixer1() function reads the num_channels field from untrusted .tplg data and uses it as a loop bound without validating it against the fixed-size channel array (SND_TPLG_MAX_CHAN). A crafted topology file with an excessive num_channels value can cause out-of-bounds heap writes, leading to a crash. (CVE-2026-25068)

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 alsa-lib --releasever 2023.10.20260216' or or 'dnf update --advisory ALAS2023-2026-1426 --releasever 2023.10.20260216' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1426.html

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

https://explore.alas.aws.amazon.com/CVE-2026-25068.html

Plugin Details

Severity: Medium

ID: 299520

File Name: al2023_ALAS2023-2026-1426.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2/19/2026

Updated: 2/19/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

CVSS Score Source: CVE-2026-25068

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

CVSS v4

Risk Factor: Medium

Base Score: 4.6

Threat Score: 1

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:alsa-lib, p-cpe:/a:amazon:linux:alsa-lib-debugsource, p-cpe:/a:amazon:linux:alsa-topology, p-cpe:/a:amazon:linux:alsa-ucm, p-cpe:/a:amazon:linux:alsa-lib-debuginfo, p-cpe:/a:amazon:linux:alsa-lib-devel, cpe:/o:amazon:linux:2023

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2/18/2026

Vulnerability Publication Date: 1/29/2026

Reference Information

CVE: CVE-2026-25068