Skip to content
Fencer Vulns
medium 6.8

CVE-2026-56109 json

ALSA Library < 1.2.16.1 Double-Free via parse_def() in conf.c

published 2026-06-22 4 mo ago modified 2026-11-08 26 h ago also EUVD-2026-38301

cvss
6.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

The Advanced Linux Sound Architecture (ALSA) library before 1.2.16.1 contains a double-free vulnerability in parse_def() in src/conf.c that allows attackers to corrupt memory by supplying maliciously crafted ALSA configuration text. When parsing nested compound or array configuration blocks, parse_def() fails to check return values before continuing, causing snd_config_delete() to be called twice on the same already-freed node, resulting in a NULL-pointer write or invalid memory read.

Patch / fix

  • alsa-project alsa-lib 1.2.16.1
  • alsa-lib Debian 14 1.2.16.1-1

debian advisories DEBIAN-CVE-2026-56109

  • alsa-lib Ubuntu 22.04 LTS 1.2.6.1-1ubuntu1.2
  • alsa-lib Ubuntu 24.04 LTS 1.2.11-1ubuntu0.3
  • alsa-lib Ubuntu 26.04 LTS 1.2.15.3-1ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-56109

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 1.2.16.1-2.hum1
  • alsa-ucm hummingbird 1 1.2.16.1-2.hum1
  • alsa-topology hummingbird 1 1.2.16.1-2.hum1

red hat advisories RHSA-2026:40573

  • alsa SLE Micro 5.5 1.2.8-150500.3.3.1
  • alsa SLE Module for Basesystem 15 SP7 1.2.10-150600.4.3.1
  • alsa SLE Micro 5.4, SLE Micro 5.3 1.2.6.1-150400.3.3.1
  • alsa Linux Micro 6.1 1.2.10-slfo.1.1_2.1
  • alsa SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.2.14-160000.3.1

suse advisories SUSE-SU-2026:3492-1SUSE-SU-2026:3270-1SUSE-SU-2026:2885-1SUSE-SU-2026:22667-1SUSE-SU-2026:22291-1SUSE-SU-2026:22381-1

  • alsa openSUSE Leap 16.0 1.2.14-160000.3.1

opensuse advisories openSUSE-SU-2026:21075-1

  • alsa-lib Azure Linux 3.0 1.2.16.1-1

azure linux advisories AZL-90204

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-2026-56109 updated cvss 6.8

alsa-lib: ALSA library: Double-free vulnerability leading to memory corruption

  • Red Hat Enterprise Linux 6 alsa-lib 1.2.15.3-2.el10
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 alsa-lib 1.2.15.3-2.el10 Red Hat Enterprise Linux 8 alsa-ucm, alsa-lib 1.2.15.3-2.el10 Red Hat Enterprise Linux 9 alsa-ucm, alsa-lib 1.2.15.3-2.el10 Red Hat Enterprise Linux 10 alsa-lib 1.2.15.3-2.el10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images alsa-lib 1.2.16.1-2.hum1, alsa-ucm 1.2.16.1-2.hum1, alsa-topology 1.2.16.1-2.hum1
    fixed: vendor fix RHSA-2026:40573

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
4 mo ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • lore.kernel.org https://lore.kernel.org/alsa-devel/CAGt8pqBU0p2voB+qHxWGcNJrKHAcBhAyHUUBPLBN-Yj_SiV6MQ@mail.gmail.com/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 7.0 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
CNA 3.1 6.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CNA 4.0 7.0 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/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

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.