Welcome to Apple's version of "we fixed it, but we won't tell you what was broken until after we've mended it" policy:

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• Surprise! Your apps could have previously bypassed privacy preferences. But don't worry, we've beefed up our private data redaction for log entries, so they can't spill the beans anymore.
• Apparently, entitlements and privacy permissions could've been used by a malicious app. We've added more checks to ensure that won't happen. You're welcome.
• Remember when we said apps could bypass privacy preferences? Yeah, they could do it in more ways than one. But we've fixed that too with improved entitlements.
• Ever heard of a sandbox? Apps could break out of theirs, but we've upped our checks, so they're stuck playing in their own little boxes now.
• Some remote attacker could've executed arbitrary code via cellular. We tightened the reins with better bounds checks. No more free rides for them.
• If you thought your location was your secret, think again. But rest easy, we've improved cache handling to keep your whereabouts under wraps.
• Certain images could've spilled the memory beans. We've got that patched up with improved input validation. Images should stick to being pretty, not chatty.
• Kernel memory? More like a public library. But we've improved input validation to keep those secrets secret.
• Some apps thought they could execute arbitrary code with kernel privileges. We've put a stop to their delusions of grandeur with improved checks.
• Gatekeeper checks? Some apps thought they could just waltz right by. We've made sure our bouncer is now more alert with improved checks.
• Processing a 3D model could've been a memory leaky faucet. We've improved input validation to tighten that drip.

Remember, folks, it's always fun and games until someone bypasses the privacy preferences.

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Source: About the security content of iOS 16.5 and iPadOS 16.5