https://www.bleepingcomputer.com/news/security/poc-released-for-windows-win32k-bug-exploited-in-attacks/

Researchers have released a proof-of-concept (PoC) exploit for an actively exploited Windows local privilege escalation vulnerability fixed as part of the May 2023 Patch Tuesday.

The Win32k subsystem (Win32k.sys kernel driver) manages the operating system's window manager, screen output, input, and graphics, and acts as an interface between various types of input hardware.