Techmeme 20260514 First public macOS kernel memory corruption exploit on Apple M5 Summary
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Techmeme surfaced this May 14, 2026 story in its Techmeme cluster, and the original post is Calif’s First public macOS kernel memory corruption exploit on Apple M5.
What happened
Security firm Calif says its engineers, working with Anthropic’s Mythos Preview, built a working macOS kernel memory corruption exploit on Apple M5 hardware in five days. The claim is notable because the target was not an old or lightly defended system. Calif says the exploit ran on bare-metal M5 hardware with kernel Memory Integrity Enforcement enabled, targeting macOS 26.4.1 from an unprivileged local user and ending with root access.
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