Models ·
Anthropic Mythos Preview Helped Build the First Public macOS M5 Kernel Exploit in Five Days
Models ·
Anthropic Mythos Preview Helped Build the First Public macOS M5 Kernel Exploit in Five Days
AI summary · Generated from this article
A three-person security firm called Calif used Anthropic's Claude Mythos Preview AI to build the first publicly disclosed macOS kernel exploit capable of surviving Apple's Memory Integrity Enforcement protection on M5 hardware. The team completed a working exploit chain in roughly five days, a timeline that would have been unthinkable without AI assistance given the complexity of the target. The exploit is a data-only local privilege escalation chain targeting macOS 26.4.1. Rather than corrupting memory pointers, which MIE's hardware tag-checking is designed to catch, the team corrupted kernel data structures that the protection was never watching. Mythos accelerated bug discovery by recognizing known vulnerability classes at machine speed, while the human researchers handled the novel challenge of bypassing a brand-new hardware mitigation. Apple has not yet issued a patch, and Calif is withholding its 55-page technical report until one ships. The broader implication is stark: AI-assisted tooling is compressing exploit development timelines from months to days, reshaping the economics of both offensive research and defensive patching simultaneously.