CVE-2021-40449

CVE-2021-40449 is a Win32k use-after-free local privilege escalation in GreResetDCInternal. The vulnerability arises when a user‑mode callback hook on the driver’s PDEV path (DrvEnablePDEV) can trigger a subsequent ResetDC call, freeing the original device context and causing a kernel‑mode use‑af...