Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-3874
Advisory Released Date: 2026-08-31
Advisory Updated Date: 2026-08-31
The Advanced Linux Sound Architecture (ALSA) library before 1.2.16.1 contains a double-free vulnerability in parse_def() in src/conf.c that allows attackers to corrupt memory by supplying maliciously crafted ALSA configuration text. When parsing nested compound or array configuration blocks, parse_def() fails to check return values before continuing, causing snd_config_delete() to be called twice on the same already-freed node, resulting in a NULL-pointer write or invalid memory read. (CVE-2026-56109)
Affected Packages:
alsa-lib
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update alsa-lib or yum update --advisory ALAS2-2026-3874 to update your system.
aarch64:
alsa-lib-1.1.4.1-2.amzn2.0.1.aarch64
alsa-lib-devel-1.1.4.1-2.amzn2.0.1.aarch64
alsa-lib-debuginfo-1.1.4.1-2.amzn2.0.1.aarch64
i686:
alsa-lib-1.1.4.1-2.amzn2.0.1.i686
alsa-lib-devel-1.1.4.1-2.amzn2.0.1.i686
alsa-lib-debuginfo-1.1.4.1-2.amzn2.0.1.i686
src:
alsa-lib-1.1.4.1-2.amzn2.0.1.src
x86_64:
alsa-lib-1.1.4.1-2.amzn2.0.1.x86_64
alsa-lib-devel-1.1.4.1-2.amzn2.0.1.x86_64
alsa-lib-debuginfo-1.1.4.1-2.amzn2.0.1.x86_64