CVE-2026-25068 alsa-lib 1.2.15.2 Topology Decoder Heap-based Buffer Overflow
A heap-based buffer overflow in alsa-lib allows attackers to cause a denial of service via a crafted topology file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-25068?
CVE-2026-25068 is a medium-severity memory corruption vulnerability in alsa-lib, published on 29 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-129
Which versions are affected by CVE-2026-25068?
Linux distribution packages (2)
alsa-lib Red Hat:hummingbird:1 | All versions | 0:1.2.15.3-3.1.hum1 |
alsa-lib-devel Red Hat:hummingbird:1 | All versions | 0:1.2.15.3-3.1.hum1 |
How do I fix CVE-2026-25068?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-25068 being exploited?
There is no known exploitation of CVE-2026-25068 in the wild and no public exploit code.
Sources
Also known as AZL-75773, AZL-76295, BELL-CVE-2026-25068, DEBIAN-CVE-2026-25068, DLA-4469-1, ECHO-ec6a-fa2d-8cab and 6 more.