A memory corruption issue was addressed with improved input validation. This issue is fixed in iOS 15.3 and iPadOS 15.3, macOS Big Sur 11.6.3, macOS Monterey 12.2. A malicious application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited..
https://www.tenable.com/cyber-exposure/tenable-2022-threat-landscape-report
https://support.apple.com/en-us/103173
https://support.apple.com/en-us/103172
https://support.apple.com/en-us/102848
https://support.apple.com/en-us/HT213055