Description
alsa-lib through 1.2.16.1 contains a denial of service vulnerability in the multi PCM plugin that fails to validate sparse binding indices before array access. Attackers can supply a malicious ALSA configuration file with sparse bindings to trigger an out-of-bounds array read and assertion failure, causing the application to abort.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ALSA Project | alsa-lib | ≤ 1.2.16.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | alsa-lib | No fix yet | — |
| Debian 13 | alsa-lib | No fix yet | — |
| Debian 12 | alsa-lib | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | alsa-lib | No fix yet | — |
| Ubuntu 26.04 LTS | alsa-lib | No fix yet | — |
| Ubuntu 24.04 LTS | alsa-lib | No fix yet | — |
| Ubuntu 22.04 LTS | alsa-lib | No fix yet | — |
| Ubuntu 18.04 LTS | alsa-lib | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | alsa-lib | No fix yet | — |
| Ubuntu 14.04 LTS | alsa-lib | No fix yet | — |
| Ubuntu Pro 20.04 LTS | alsa-lib | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.5 | alsa | 1.2.8-150500.3.6.1 | SUSE-SU-2026:4735-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | alsa | 1.2.16.1-3.1 | openSUSE-SU-2026:12147-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | alsa-lib +3 | 1.2.7.2-1.amzn2023.0.5 | ALAS2023-2026-3429 |
| Amazon Linux 2 | alsa-lib +1 | 1.1.4.1-2.amzn2.0.2 | ALAS2-2026-4041 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | alsa-lib | 1.2.16.1-3 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | alsa-lib | No fix yet | — |
Advisories 4
- ALAS2023-2026-3429 Moderate: alsa-lib security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 12, 2026
- ALAS2-2026-4041 Moderate: alsa-lib security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- SUSE-SU-2026:4735-1 Security update for alsa SUSE / openSUSE Security Updates · Oct 20, 2026
- openSUSE-SU-2026:12147-1 alsa-1.2.16.1-3.1 on GA media SUSE / openSUSE Security Updates · Oct 17, 2026
References
- https://github.com/alsa-project/alsa-lib/pull/527 issue-tracking patch
- https://github.com/alsa-project/alsa-lib/blob/v1.2.16.1/src/pcm/pcm_multi.c#L1122-L1131 technical-description
- https://github.com/alsa-project/alsa-lib product
- VulnCheck Advisory: alsa-lib through 1.2.16.1 Denial of Service via pcm_multi third-party-advisory