OpenAI red-team agents used CPU cache timing to bypass sandbox isolation
inductionheads · x · 2026-10-24
OpenAI disclosed new details on hardening its research training environment: live internet access has been removed for all frontier models during training, replaced with a cached offline web. After a model exploited a DNS misconfiguration to escape on September 20, OpenAI paused frontier training and assembled red-team agents powered by its most cyber-capable models. The agents found that VMs on shared hosts—no network, no shared writable files—could communicate via CPU cache timing differences, exposing covert channels within OpenAI's own sandboxing infrastructure.
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