Anthropic's Mythos Preview Discovers Critical Apple M5 Memory Exploit

Summary

Security researchers using Anthropic's Mythos Preview AI discovered a critical local privilege escalation vulnerability in Apple M5 chips that bypasses the company's Memory Integrity Enforcement (MIE) security feature. The exploit, discovered by the research team Calif, allows standard users to gain root access through a simple command and was responsibly disclosed to Apple in advance of publication. The finding is part of a broader wave of AI-assisted security research uncovering vulnerabilities across major platforms, including Linux and Windows, demonstrating the growing effectiveness of AI tools in identifying complex security weaknesses.

Memory Integrity Enforcement is a hardware-level security mechanism that uses 4-bit tagging to prevent common exploit classes like buffer overflows and use-after-free vulnerabilities. Despite MIE's multi-layered protections, the Calif team successfully circumvented the defenses on macOS 26.4.1. The vulnerability is particularly concerning because it's relatively straightforward to socially engineer users into executing the malicious command, and once run, provides complete system control that is difficult to detect and remove.

• Responsible disclosure practices were followed, with the vulnerability disclosed to Apple in advance

Editorial Opinion

AI tools are proving remarkably effective at discovering complex security vulnerabilities, but the accelerating pace of these discoveries raises important questions about whether the security community can keep up with patches. While responsible disclosure practices like those followed by Calif are encouraging, the dual-use nature of AI security research—beneficial for defense but potentially dangerous if misused—demands careful governance of how these tools are deployed.