From Wikipedia:
Programs and subsystems in user mode are limited in terms of what system resources they have access to, while the kernel mode has unrestricted access to the system memory and external devices. Kernel mode in Windows NT has full access to the hardware and system resources of the computer.
squaresinger@lemmy.world 2 days ago
From what I read, Microsoft is planning to kick anti-cheat out of the Windows kernel too, so maybe that will help on the Linux side as well.