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. Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26972 Reference (s):
- https://bugzilla.mozilla.org/show_bug.cgi?id=1671382
- URL: https://bugzilla.mozilla.org/show_bug.cgi?id=1671382
- https://www.mozilla.org/security/advisories/mfsa2020-54/
- URL: https://www.mozilla.org/security/advisories/mfsa2020-54/