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.

An update of the alsa package has been released.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:3270-1 advisory.

    This update for alsa fixes the following issue

    - CVE-2026-56109: double-free vulnerability in parse_def() in src/conf.c that can allow attackers to     corrupt memory       (bsc#1268853).

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8538-1 advisory.

    It was discovered that alsa-lib incorrectly handled certain ALSA configuration text. An attacker could use     this issue to cause alsa-lib to crash, resulting in a denial of service, or possibly 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.

The remote SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:22381-1 advisory.

    This update for alsa fixes the following issue

    - CVE-2026-56109: double-free vulnerability in parse_def() in src/conf.c that allows attackers to corrupt     memory       (bsc#1268853).

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by a vulnerability as referenced in the openSUSE- SU-2026:21075-1 advisory.

    This update for alsa fixes the following issue

    - CVE-2026-56109: double-free vulnerability in parse_def() in src/conf.c that allows attackers to corrupt     memory       (bsc#1268853).

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
337984	Photon OS 5.0: Alsa PHSA-2026-5.0-91-0960	Nessus	PhotonOS Local Security Checks	Local	high
333717	Photon OS 5.0: Alsa PHSA-2026-5.0-92-0941	Nessus	PhotonOS Local Security Checks	Local	high
330315	SUSE SLED15 / SLES15 Security Update : alsa (SUSE-SU-2026:3270-1)	Nessus	SuSE Local Security Checks	Local	high
326998	Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : alsa-lib vulnerability (USN-8538-1)	Nessus	Ubuntu Local Security Checks	Local	high
324840	SUSE SLES16: alsa / alsa-devel / alsa-docs / alsa-topology-devel / libasound2 / etc (SUSE-SU-2026:22381-1)	Nessus	SuSE Local Security Checks	Local	high
324051	openSUSE 16: alsa / alsa-devel / alsa-topology-devel / libasound2 / etc (openSUSE-SU-2026:21075-1)	Nessus	SuSE Local Security Checks	Local	high
322133	Linux Distros Unpatched Vulnerability : CVE-2026-56109	Nessus	Misc.	Local	high

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CVE-2026-56109

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