Description
An Ubuntu-specific patch in PulseAudio created a race condition where the snap policy module would fail to identify a client connection from a snap as coming from a snap if SCM_CREDENTIALS were missing, allowing the snap to connect to PulseAudio without proper confinement. This could be exploited by an attacker to expose sensitive information. Fixed in 1:13.99.3-1ubuntu2, 1:13.99.2-1ubuntu2.1, 1:13.99.1-1ubuntu3.8, 1:11.1-1ubuntu7.11, and 1:8.0-0ubuntu3.15.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Canonical | pulseaudio | 1:13.99.3-1 – < 1:13.99.3-1ubuntu2, 1:13.99.2-1 – < 1:13.99.2-1ubuntu2.1, 1:13.99.1-1 – < 1:13.99.1-1ubuntu3.8, 1:11.1-1 – < 1:11.1-1ubuntu7.11, 1:8.0-0 – < 1:8.0-0ubuntu3.15 | 1:13.99.3-1ubuntu2 |
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.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | pulseaudio | 1:13.99.1-1ubuntu3.8 | USN-4640-1 |
| Ubuntu 18.04 LTS | pulseaudio | 1:11.1-1ubuntu7.11 | USN-4640-1 |
| Ubuntu 16.04 LTS | pulseaudio | 1:8.0-0ubuntu3.15 | USN-4640-1 |
Advisories 1
- USN-4640-1 pulseaudio vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
References
- https://launchpad.net/bugs/1895928 vendor-advisory
- https://ubuntu.com/USN-4640-1 vendor-advisory