Skip to content
Fencer Vulns
medium 4.6

CVE-2026-25068 json

alsa-lib 1.2.15.2 Topology Decoder Heap-based Buffer Overflow

published 2026-01-29 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-4970

cvss
4.6
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

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.

Patch / fix

  • alsa-lib Debian 13 1.2.14-1+deb13u1
  • alsa-lib Debian 14 1.2.16-1

debian advisories DEBIAN-CVE-2026-25068

  • alsa-lib Ubuntu 22.04 LTS 1.2.6.1-1ubuntu1.1
  • alsa-lib Ubuntu 24.04 LTS 1.2.11-1ubuntu0.2
  • alsa-lib Ubuntu 25.10 1.2.14-1ubuntu1.1
  • alsa-lib Ubuntu 26.04 LTS 1.2.15.3-1ubuntu1
  • alsa-lib Ubuntu Pro 20.04 LTS 1.2.2-2.1ubuntu2.5+esm1

ubuntu advisories UBUNTU-CVE-2026-25068

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • alsa-lib hummingbird 1 1.2.15.3-3.1.hum1

red hat advisories RHSA-2026:7401

  • alsa-lib Azure Linux 3.0 1.2.9-2
  • alsa-lib CBL-Mariner 2.0 1.2.6.1-3

azure linux advisories AZL-75773AZL-76295

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-25068 updated cvss 4.3

alsa-lib: alsa-lib Topology Decoder Heap-based Buffer Overflow

  • Red Hat Enterprise Linux 6 alsa-lib Red Hat Enterprise Linux 7 alsa-lib Red Hat Enterprise Linux 8 alsa-lib, alsa-ucm Red Hat Enterprise Linux 9 alsa-lib, alsa-ucm Red Hat Enterprise Linux 10 alsa-lib
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images alsa-lib 1.2.15.3-3.1.hum1
    fixed: vendor fix RHSA-2026:7401
  • Red Hat Hardened Images alsa-ucm 1.2.15.3-3.1.hum1, alsa-topology 1.2.15.3-3.1.hum1
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 4.6 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
CNA 4.0 4.6 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • ALSA Project alsa-lib

Classification

Weakness
  • CWE-129 Improper Validation of Array Index

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.