This paper examines a previously undocumented timing-based vulnerability in the NAO humanoid robot’s actuator command pipeline, internally referred to as “upspeed leakage” (UpsLeak). Exploitable via overscheduled motion threads, the issue allowed an attacker to exceed safe joint velocity limits, causing potential hardware damage. The vendor released a patch designated “UpsLeak-90,” which modifies the real-time scheduler’s priority inheritance and caps joint acceleration to 90% of the theoretical maximum. We validate the patch’s effectiveness through repeatable exploit attempts and benchmark performance degradation. Results show full mitigation of the vulnerability with ≤3.2% increase in motion latency.
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