Vulnerability · Published Jan 29, 2026 · Assigned by VulnCheck
CVE-2026-25068alsa-lib 1.2.15.2 Topology Decoder Heap-based Buffer Overflow
Medium 4.6
In plain English
A medium-severity security flaw in alsa-lib from ALSA Project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | alsa-lib | no fix listed | DEBIAN-CVE-2026-25068 |
| Debian:13 | alsa-lib | 1.2.14-1+deb13u1 | DEBIAN-CVE-2026-25068 |
| Debian:14 | alsa-lib | 1.2.16-1 | DEBIAN-CVE-2026-25068 |
| Ubuntu:22.04:LTS | alsa-lib | 1.2.6.1-1ubuntu1.1 | USN-8044-1 |
| Ubuntu:22.04:LTS | alsa-lib | 1.2.6.1-1ubuntu1.1 | UBUNTU-CVE-2026-25068 |
| Ubuntu:24.04:LTS | alsa-lib | 1.2.11-1ubuntu0.2 | USN-8044-1 |
| Ubuntu:24.04:LTS | alsa-lib | 1.2.11-1ubuntu0.2 | UBUNTU-CVE-2026-25068 |
| Ubuntu:25.10 | alsa-lib | 1.2.14-1ubuntu1.1 | UBUNTU-CVE-2026-25068 |
| Ubuntu:25.10 | alsa-lib | 1.2.14-1ubuntu1.1 | USN-8044-1 |
| Ubuntu:26.04:LTS | alsa-lib | 1.2.15.3-1ubuntu1 | UBUNTU-CVE-2026-25068 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ALSA Project | alsa-lib | 1.2.2 – through 1.2.15.2 |
Weakness: CWE-129 · 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