As many will recall from a post we ran in mid-December, Kunlun Lab security researcher Zweig (@realBrightiup) had planned to share details about a bug that could have been used to exploit the kernel on iOS & iPadOS versions 15.0-15.1.1.
Brightiup publishes write-up on kernel bug CVE-2021-30955 for iOS 15.0-15.1.1