A logic issue was addressed with improved file handling. This issue is fixed in iOS 18.2 and iPadOS 18.2, macOS Sequoia 15.2, tvOS 18.2, visionOS 2.2, watchOS 11.2. Restoring a maliciously crafted backup file may lead to modification of protected system files.
https://support.apple.com/en-us/121845
https://support.apple.com/en-us/121844
https://support.apple.com/en-us/121843