Modern GPUs (AMD, Intel and NVidia) have a per process page table so the worse you can do is access memory mapped to the GPU for _your_ process. That is assuming you can guess the virtual address of those, a wrong guess…
Modern GPUs (AMD, Intel and NVidia) have a per process page table so the worse you can do is access memory mapped to the GPU for _your_ process. That is assuming you can guess the virtual address of those, a wrong guess…