A memory corruption issue was addressed with improved validation. This issue is fixed in iOS 16.7.6 and iPadOS 16.7.6, iOS 17.4 and iPadOS 17.4. An attacker with arbitrary kernel read and write capability may be able to bypass kernel memory protections. Apple is aware of a report that this issue may have been exploited.
https://support.apple.com/kb/HT214088
https://support.apple.com/kb/HT214087
https://support.apple.com/kb/HT214086
https://support.apple.com/kb/HT214085
https://support.apple.com/kb/HT214084
https://support.apple.com/kb/HT214083
https://support.apple.com/en-us/HT214082
https://support.apple.com/en-us/HT214081
http://seclists.org/fulldisclosure/2024/Mar/26
http://seclists.org/fulldisclosure/2024/Mar/25
http://seclists.org/fulldisclosure/2024/Mar/24
http://seclists.org/fulldisclosure/2024/Mar/23
http://seclists.org/fulldisclosure/2024/Mar/22
http://seclists.org/fulldisclosure/2024/Mar/21