Description
snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Canonical | snapd | unspecified – ≤ 2.54.2 | — |
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 | snapd | 2.54.3-1 | — |
| Debian 13 | snapd | 2.54.3-1 | — |
| Debian 12 | snapd | 2.54.3-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | snapd | 2.54.3+20.04.1 | USN-5292-2, USN-5292-1 |
| Ubuntu 18.04 LTS | snapd | 2.54.3+18.04 | USN-5292-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | snapd | 2.54.3+16.04~esm2 | USN-5292-3 |
| Ubuntu Pro 14.04 LTS | snapd | 2.54.3+14.04~esm1 | USN-5292-3 |
Advisories 3
- USN-5292-3 snapd vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5292-1 snapd vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-5292-2 snapd vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026