New Bit2Watt Attack Could Let Cloud Tenants Disrupt Power Grids Without an Exploit
Summary: Three Zhejiang University researchers describe Bit2Watt, a technique in a paper accepted to CHES 2026 in which a cloud tenant with ordinary GPU access toggles compute load to create power oscillations of roughly 1.5 kHz to 6 kHz, measured on real GPUs including the A100, Tesla V100, and RTX 4090. In a simulated 1 MW grid 90% powered by distributed energy resources with 1,000 GPUs modulating in lockstep, current total harmonic distortion reached 46.8% against a 13% IEC 61000-3-12 guideline and the damping ratio fell to -0.27, though the authors state that aligning power transitions across a real cloud fleet remains an open problem and that no production system was tested or attacked.
What's compelling: The load-bearing assumption is lockstep synchronization across 1,000 GPUs, and the researchers concede they have not run large-scale synchronization experiments in a production cloud, so the 46.8% distortion and 81% load-shed figures are upper bounds from simulation rather than forecasts. The exposure has no patch because it sits in the seam between volatile GPU load and an inverter-heavy grid, which the compute side and the grid side - run by different companies with different tools - are not built to watch across.
Read the original at The Hacker News ↗
- Topics
- OT / ICS & Critical Infrastructure
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