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An issue present in lowering/register allocation could have led to obscure but deterministic register confusion failures in JITted code that would lead to a potentially exploitable crash. This vulnerability affects Firefox < 91 and Thunderbird < 91.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade librewolf | Aug 22, 2024 | Aug 17, 2021 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Aug 17, 2021 |
| Gentoo Linux | — | Upgrade www-client/firefox-bin.Upgrade www-client/firefox. | Feb 22, 2022 | Aug 17, 2021 |
| Mfsa2021 33 | — | Upgrade to Mozilla Firefox version 91.0Upgrade to the latest version of Mozilla Firefox | Aug 12, 2021 | Aug 10, 2021 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 91.0 | Aug 12, 2021 | Aug 11, 2021 |
| Oracle Solaris | — | Upgrade mail/thunderbird to version 91.3.0-11.4.40.0.1.107.1 on Solaris 11.4Upgrade web/browser/firefox to version 91.3.0-11.4.40.0.1.107.1 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 91.3.0-11.4.40.0.1.107.1 on Solaris 11.4 | Dec 13, 2021 | Aug 17, 2021 |
| Suse | — | Upgrade MozillaFirefox-translations-commonUpgrade MozillaFirefoxUpgrade MozillaFirefox-develUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbird-translations-otherUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-commonUpgrade MozillaThunderbirdUpgrade mozillafirefox-branding-sleUpgrade rust-cbindgenUpgrade MozillaFirefox-branding-SLED | Sep 23, 2021 | Aug 11, 2021 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Aug 12, 2021 | Aug 11, 2021 |
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