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": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "91",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"product": "Thunderbird",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "91",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]