A memory corruption issue was addressed with improved validation. This issue is fixed in tvOS 15.4, iOS 15.4 and iPadOS 15.4, macOS Monterey 12.3, watchOS 8.5. An application may be able to execute arbitrary code with kernel privileges.
https://support.apple.com/en-us/HT213193
https://support.apple.com/en-us/HT213186