Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/alsa-project/alsa-lib/commit/5f7fe33002d2d98d84f72e381ec2cccc
- https://www.vulncheck.com/advisories/alsa-lib-topology-decoder-heap-based-buffer
- https://lists.debian.org/debian-lts-announce/2026/02/msg00008.html
FAQ
What is CVE-2026-25068?
CVE-2026-25068 is a documented vulnerability. 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 rea...
How severe is CVE-2026-25068?
CVSS scoring is not yet available for CVE-2026-25068. Check NVD for updates.
Is there a patch for CVE-2026-25068?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.