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.
History

Fri, 30 Jan 2026 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Alsa-project
Alsa-project alsa-lib
Vendors & Products Alsa-project
Alsa-project alsa-lib

Fri, 30 Jan 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
References
Metrics threat_severity

None

cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'}

threat_severity

Moderate


Thu, 29 Jan 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 29 Jan 2026 19:30:00 +0000

Type Values Removed Values Added
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.
Title alsa-lib 1.2.15.2 Topology Decoder Heap-based Buffer Overflow
Weaknesses CWE-129
References
Metrics cvssV4_0

{'score': 4.6, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-01-29T20:24:16.805Z

Reserved: 2026-01-28T21:47:35.120Z

Link: CVE-2026-25068

cve-icon Vulnrichment

Updated: 2026-01-29T20:24:07.163Z

cve-icon NVD

Status : Received

Published: 2026-01-29T20:16:10.623

Modified: 2026-01-29T20:16:10.623

Link: CVE-2026-25068

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-01-29T19:08:03Z

Links: CVE-2026-25068 - Bugzilla