During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://www.mozilla.org/security/advisories/mfsa2021-47/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2021-45/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2021-43/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2021-46/ | broken link |
| https://www.mozilla.org/security/advisories/mfsa2021-44/ | vendor advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1725335 | issue tracking permissions required vendor advisory |
| https://www.debian.org/security/2022/dsa-5034 | issue tracking third party advisory vendor advisory |
| https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html | third party advisory mailing list |