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Behind Bars

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Your GPU Neighbor Can Hear Your Model — Branislav Brzak, Stealthium Oct 12, 2026 · 13:21 An H100 timing side channel allows an attacker to infer an LLM's model type, depth, and decoding speed by monitoring microsecond timing variations on shared GPU hardware, even without reading memory or exploiting bugs.

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Your GPU Neighbor Can Hear Your Model — Branislav Brzak, Stealthium

An H100 timing side channel allows an attacker to infer an LLM's model type, depth, and decoding speed by monitoring microsecond timing variations on shared GPU hardware, even without reading memory or exploiting bugs.

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