NVIDIA Windows GPU Display Driver (nvlddmkm.sys): Unsynchronized shared state (static variables across threads)

Impact

Unsynchronized shared state (static variables across threads) in the escape handler. Two threads racing produce undefined kernel behaviour - crash, escalation or information disclosure depending on what lands.

Who can reach it

Any local user able to issue concurrent escape calls, which is any process with GPU access.

What to do

Install the fixed Windows GPU Display Driver branch listed in the NVIDIA bulletin. nvlddmkm.sys is a kernel driver: the swap needs a host reboot, so on a Windows GPU node this is a drain-and-reboot, not a live driver reload. No VBIOS or BMC flash involved.

References