Description
alsa-lib through 1.2.16.1 computes combined topology element size using 32-bit arithmetic in src/topology/ctl.c, allowing integer overflow that defeats bounds checks. Attackers can supply crafted topology files that wrap size calculations, causing the decoder to read beyond the topology buffer and potentially leak sensitive data or crash the application.
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 |
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 2
- 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/topology/ctl.c#L1316-L1326 technical-description
- https://github.com/alsa-project/alsa-lib/blob/v1.2.16.1/src/topology/ctl.c#L1420-L1430 technical-description
- https://github.com/alsa-project/alsa-lib/blob/v1.2.16.1/src/topology/ctl.c#L1511-L1521 technical-description
- https://github.com/alsa-project/alsa-lib product
- VulnCheck Advisory: alsa-lib through 1.2.16.1 Integer Overflow via Topology File third-party-advisory