Linux Kernel pds_core Wait Context Vulnerability Leading to Kernel Crashes

A vulnerability in the Linux kernel's pds_core component was introduced by handling the wait_context as a temporary stack variable, which disappeared after the pdsc_adminq_post() function completed. This issue became apparent when a slow development firmware caused an adminq request to time out, only for the firmware to later finish the request and send an interrupt. The handler attempted to complete the request using a context that no longer existed, leading to improper pointer usage, kernel crashes, and significant disruption.

Impact

The vulnerability caused kernel crashes due to bad pointer usage, disrupting system stability.