Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/alsa-project/alsa-lib/commit/536dd6f8affdf5197c12a63a71c92a70
- https://github.com/alsa-project/alsa-lib/releases/tag/v1.2.16.1
- https://lore.kernel.org/alsa-devel/CAGt8pqBU0p2voB+qHxWGcNJrKHAcBhAyHUUBPLBN-Yj_
- https://www.vulncheck.com/advisories/alsa-library-double-free-via-parse-def-in-c
FAQ
What is CVE-2026-56109?
CVE-2026-56109 is a vulnerability with a CVSS score of 6.8 (MEDIUM). 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 ...
How severe is CVE-2026-56109?
CVE-2026-56109 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56109?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.