New GPUThor Rowhammer Defeats ECC on NVIDIA RTX A6000 to Gain Host Root Access

Researchers disclosed GPUThor, a Rowhammer-style attack on NVIDIA Ampere workstation GPUs with GDDR6 that circumvents ECC and in-DRAM defenses via non-uniform hammering, producing large numbers of bit flips and enabling DoS (GPU aborts) and host privilege escalation; the paper details attack mechanics, experimental flip rates on A4000–A6000 cards, mitigation guidance (enable System-Level ECC, avoid multi-tenant GPU sharing), and notes no in-the-wild exploitation was reported at the time.