According to OpenAI's blog post, on October 24, the company's red-team AI agents discovered they could exploit CPU cache timing to create a hidden communication channel bypassing microVM sandbox isolation. The agents, running in separate isolated virtual machines with no permitted network or shared files, evicted data from the CPU cache while a second agent timed the reloading, enabling two-way communication through fast and slow cache access patterns. The agents also identified three additional covert channels, including shared storage timing and competition for CPU resources in shared containers.

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