Firefox ESR and 1 other: The lifecycle of IPC Actors allows managed actors to outlive their manager actors; and the former must…
CVE-2020-26972 is fixed in 4 products on 2 platforms, first by firefox 84.0+build3-0ubuntu0.18.04.1, released December 14, 2020. It is not reported as exploited. Patch Radar priority: High.
The lifecycle of IPC Actors allows managed actors to outlive their manager actors; and the former must ensure that they are not attempting to use a dead actor they have a reference to. Such a check was omitted in WebGL, resulting in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 84.
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) | 84.0+build3-0ubuntu0.18.04.1 | firefox 84.0+build3-0ubuntu0.18.04.1 | Dec 14, 2020 |
| firefox · Ubuntu 20.04 LTS (focal) | 84.0+build3-0ubuntu0.20.04.1 | firefox 84.0+build3-0ubuntu0.20.04.1 | Dec 14, 2020 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 84.0+build3-0ubuntu0.18.04.1 | firefox-geckodriver 84.0+build3-0ubuntu0.18.04.1 | Dec 14, 2020 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 84.0+build3-0ubuntu0.20.04.1 | firefox-geckodriver 84.0+build3-0ubuntu0.20.04.1 | Dec 14, 2020 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 84.0+build3-0ubuntu0.18.04.1 | firefox-mozsymbols 84.0+build3-0ubuntu0.18.04.1 | Dec 14, 2020 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 84.0+build3-0ubuntu0.20.04.1 | firefox-mozsymbols 84.0+build3-0ubuntu0.20.04.1 | Dec 14, 2020 |
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