The technique exploits a design flaw in the way memory cells that store the data are organized in a DRAM module. Because the cells are too close together, the researchers found that if they bomb the same area with enough read-write operations, they can modify the in-memory information.
Hammering one location this way causes a change in the value of the data bits in its proximity from one to zero and vice-versa. This effect is known as bit-flipping and it can serve an attacker to at least trigger a denial-of-service condition; greater possible risks include increased privileges on the machine, or
hijack a device.
GPUHammer – First Rowhammer Attack Targeting NVIDIA GPUs
There’s a new way to flip bits in DRAM, and it works against the latest defenses
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