A use-after-free issue was addressed with improved memory management. This issue is fixed in iOS 18.1 and iPadOS 18.1, watchOS 11.1, visionOS 2.1, tvOS 18.1. An app may be able to cause unexpected system termination or corrupt kernel memory.
https://support.apple.com/en-us/121569
https://support.apple.com/en-us/121566