"The attacks exploit memory hardware's increasing susceptibility to bit flips, in which 0s stored in memory switch to 1s and vice versa. In 2014, researchers first demonstrated that repeated, rapid access-or 'hammering'-of memory hardware known as DRAM creates electrical disturbances that flip bits."
"On Thursday, two research teams, working independently of each other, demonstrated attacks against two cards from Nvidia's Ampere generation that take GPU rowhammering into new-and potentially much more consequential-territory: GDDR bitflips that give adversaries full control of CPU memory, resulting in full system compromise of the host machine."
"Our work shows that Rowhammer, which is well-studied on CPUs, is a serious threat on GPUs as well."
Recent research reveals that Rowhammer attacks, previously focused on CPU DRAM, can now target Nvidia's Ampere generation GPUs. These attacks exploit vulnerabilities in GDDR memory, enabling malicious users to gain full root control of host machines. The attacks require IOMMU memory management to be disabled, which is often the default setting in BIOS. This development highlights the increasing susceptibility of GPU memory to bit flips, posing significant security risks in cloud environments where high-performance GPUs are shared among multiple users.
Read at Ars Technica
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