GPUBreach exploit uses GPU bit flips to gain root shell

GPUBreach is described as an attack technique that uses GPU memory bit-flips to escalate privileges and potentially take full control of a system. The approach targets GPU page tables in memory, using bit flips to gain arbitrary GPU memory read/write and then escalate to CPU-level privileges, potentially yielding a root shell. The researchers claim this can occur even when IOMMU is enabled, enabling system-wide compromise without disabling key protections.

The technique relies on GPU Rowhammer-like faults in GDDR6 memory and demonstrates data leakage and manipulation of machine learning weights, as well as leakage of cryptographic keys. ECC is discussed as a mitigating measure, though it is noted not to be a foolproof defence against GPUBreach, particularly on consumer GPUs where ECC is unavailable. According to gpuhammer[.]com, the combined effect is a more potent threat than prior GPU hammering methods, with the potential for full system takeover.