firefox is vulnerable to denial of service. An issue present in lowering/register allocation could lead to obscure but deterministic register confusion failures in JIT-ed code that would lead to a potentially exploitable crash.
bugzilla.mozilla.org/show_bug.cgi?id=1707774
git.launchpad.net/ubuntu-cve-tracker/tree/active/CVE-2021-29981
security.gentoo.org/glsa/202202-03
www.mozilla.org/en-US/security/advisories/mfsa2021-33/#CVE-2021-29981
www.mozilla.org/security/advisories/mfsa2021-33/
www.mozilla.org/security/advisories/mfsa2021-36/