KB5121003: RGB lighting drivers can make games unresponsive

What changed

After KB5121003, affected games can become unresponsive, close without notice, raise EXCEPTION_ACCESS_VIOLATION or restart the device. Microsoft names ARC Raiders, MARVEL Tōkon: Fighting Souls and THE FINALS among reported examples.

Why it matters

Endpoint teams need to distinguish this investigated interaction with RGB-related drivers from a general Windows or game failure before broad deployment to affected hardware.

Known limitations

• Microsoft is investigating the interaction and has not published a mitigation yet.

Now check

• Inventory RGB-control software and drivers with names similar to inpoutx64 in the Windows 11 pilot ring
• Test affected applications on builds 26100.9168 and 26200.9168 before broad deployment
• Collect a Feedback Hub report with Windows key + F and monitor the KB for updated guidance