CVE-2026-25068
mediumpriority · track · 0EPSS 0.002 · 9 %ileEURUEPSS · scored 2026-10-22
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1–4.6
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
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affected products (21)
Products and version ranges known to be affected.
also known as (4)
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sources
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references (10)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2026-25068cnnvd
- https://github.com/alsa-project/alsa-libPatchcnnvd
- https://github.com/alsa-project/alsa-lib/commit/5f7fe33002d2d98d84f72e381ec2cccc0d5d3d40cnnvd
- https://vigilance.fr/vulnerability/alsa-lib-buffer-overflow-via-tplg-decode-control-mixer1-49563cnnvd
- https://www.vulncheck.com/advisories/alsa-lib-topology-decoder-heap-based-buffer-overflowcnnvd
- https://github.com/alsa-project/alsa-lib/commit/5f7fe33002d2d98d84f72e381ec2cccc0d5d3d40enisa_euvd
- https://www.vulncheck.com/advisories/alsa-lib-topology-decoder-heap-based-buffer-overflowenisa_euvd
- https://github.com/alsa-project/alsa-lib/commit/5f7fe33002d2d98d84f72e381ec2cccc0d5d3d40nvd
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