Nael Abu-Ghazaleh

The issue allows access to application data processed on the GPU through a side channel exposed by the GPU performance counters. It requires local user access and is not a network or remote attack vector.

The issue is related to the `spectre v2 select mitigation` function in the Linux kernel, which does not always fill RSB upon a context switch. This makes it easier for attackers to conduct userspace-userspace spectreRSB attacks, potentially allowing them to access confidential data.