An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in iOS 15.7.8 and iPadOS 15.7.8, macOS Big Sur 11.7.9, macOS Monterey 12.6.8, macOS Ventura 13.5. An app may be able to execute arbitrary code with kernel privileges.
https://support.apple.com/kb/HT213845
https://support.apple.com/kb/HT213844
https://support.apple.com/kb/HT213843
https://support.apple.com/kb/HT213842
https://support.apple.com/en-us/HT213845
https://support.apple.com/en-us/HT213844