Firefox ESR and 1 other: When Web Render components were destructed, a race condition could have caused undefined behavior, and…
CVE-2021-29952 is fixed in 4 products on 2 platforms, first by firefox 88.0.1+build1-0ubuntu0.18.04.2, released May 6, 2021. It is not reported as exploited. Patch Radar priority: High.
When Web Render components were destructed, a race condition could have caused undefined behavior, and we presume that with enough effort may have been exploitable to run arbitrary code. This vulnerability affects Firefox < 88.0.1 and Firefox for Android < 88.1.3.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 91.0 | Mozilla Firefox ESR (en-US) 91.0 | Aug 4, 2021 |
| Linux | |||
| firefox · Ubuntu 18.04.6 LTS (bionic) | 88.0.1+build1-0ubuntu0.18.04.2 | firefox 88.0.1+build1-0ubuntu0.18.04.2 | May 6, 2021 |
| firefox · Ubuntu 20.04 LTS (focal) | 88.0.1+build1-0ubuntu0.20.04.2 | firefox 88.0.1+build1-0ubuntu0.20.04.2 | May 6, 2021 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 88.0.1+build1-0ubuntu0.18.04.2 | firefox-geckodriver 88.0.1+build1-0ubuntu0.18.04.2 | May 6, 2021 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 88.0.1+build1-0ubuntu0.20.04.2 | firefox-geckodriver 88.0.1+build1-0ubuntu0.20.04.2 | May 6, 2021 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 88.0.1+build1-0ubuntu0.18.04.2 | firefox-mozsymbols 88.0.1+build1-0ubuntu0.18.04.2 | May 6, 2021 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 88.0.1+build1-0ubuntu0.20.04.2 | firefox-mozsymbols 88.0.1+build1-0ubuntu0.20.04.2 | May 6, 2021 |
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