Key Findings University of Toronto researchers developed GPUThor, a Rowhammer attack that defeats ECC protection on NVIDIA RTX A-series GPUs with GDDR6 memory Attack enables privilege escalation to root on host systems and requires only unprivileged CUDA kernel execution Four NVIDIA GPUs confirmed vulnerable: RTX A6000, A5000, A4000, and A4500 Non-uniform hammering technique achieves 72,000 to 377,000 bit flips per gigabyte with ECC disabled, up to 23,000 times more effective
