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.
Problem types
CWE-129 Improper Validation of Array Index
Product status
1.2.2 (semver) before 1.2.15.2
commit 5f7fe33
Credits
Sajeeb Lohani (sml555 / prodigysml)
VulnCheck
References
lists.debian.org/debian-lts-announce/2026/02/msg00008.html
github.com/...ommit/5f7fe33002d2d98d84f72e381ec2cccc0d5d3d40
www.vulncheck.com/...logy-decoder-heap-based-buffer-overflow