University researchers have found an unpatchable security flaw in Apple Silicon Macs, which would allow an attacker to break encryption and get access to cryptographic keys.
The flaw is present in M1, M2, and M3 chips, and because the failing is part of the architecture of the chips, there’s no way for Apple to fix it in current devices
https://9to5mac.com/2024/03/22/unpatchable-security-flaw-mac/