A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 15.4 and iPadOS 15.4, Security Update 2022-003 Catalina, macOS Monterey 12.3, macOS Big Sur 11.6.5. A malicious application may be able to execute arbitrary code with kernel privileges.
https://support.apple.com/en-us/HT213185
https://support.apple.com/en-us/HT213184