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

Severity: medium (CVSS 4.6 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-29 · updated 2026-06-17
Weakness: CWE-129

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.

Affected products

ALSA Project alsa-lib: from 1.2.2 through 1.2.15.2

References

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