Memory Integrity Enforcement: a new era of always-on memory safety for Apple devices

Apple describes the rollout of Memory Integrity Enforcement (MIE) — a deeply integrated hardware-software system combining secure typed memory allocators and Enhanced Memory Tagging Extension (EMTE) in synchronous mode, along with tag confidentiality enforcement — to provide always-on defenses against memory corruption vulnerabilities across critical subsystems (including kernel and userland). The effort spans half a decade of design and collaboration between Apple silicon and OS teams, aiming to block classes of exploits like buffer overflows and use-after-free before they can be chained. In Apple’s evaluation, MIE significantly constrains attacker options and disrupts many contemporary exploit techniques, marking what they call “the most significant upgrade to memory safety in the history of consumer operating systems.” 

https://security.apple.com/blog/memory-integrity-enforcement/

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