Description
Mozilla Developer Nicolas Silva found that when using WebRender, Firefox would under certain conditions leak arbitrary GPU memory to the visible screen. The leaked memory content was visible to the user, but not observable from web content. This vulnerability affects Firefox < 77.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 77 | 77 |
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 | firefox | 77.0.1+build1-0ubuntu0.20.04.1 | USN-4383-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | firefox | 77.0.1+build1-0ubuntu0.18.04.1 | USN-4383-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 16.04 LTS | firefox | 77.0.1+build1-0ubuntu0.16.04.1 | USN-4383-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 77.0-r0 | — |
| Alpine v3.23 | firefox +1 | 77.0-r0 | — |
| Alpine v3.22 | firefox +1 | 77.0-r0 | — |
| Alpine v3.21 | firefox +1 | 77.0-r0 | — |
| Alpine v3.20 | firefox | 77.0-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 77.0-r0 | — |
| Alpine v3.18 | firefox | 77.0-r0 | — |
| Alpine v3.17 | firefox | 77.0-r0 | — |
| Alpine v3.16 | firefox | 77.0-r0 | — |
| Alpine v3.15 | firefox | 77.0-r0 | — |
| Alpine v3.14 | firefox | 77.0-r0 | — |
| Alpine v3.13 | firefox | 77.0-r0 | — |
| Alpine v3.12 | firefox | 77.0-r0 | — |
Advisories 3
- USN-4383-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026