CVE-2026-25068 – alsa-lib 1.2.15.2 Topology Decoder Heap-based Buffer Overflow

CVE ID : CVE-2026-25068

Published : Jan. 29, 2026, 8:16 p.m. | 53 minutes ago

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.

Severity: 4.6 | MEDIUM

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