Provide references for CVE-2021-40449.
Where can I find more information about CVE-2021-40449?
References are available at: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40449, http://packetstormsecurity.com/files/164926/Win32k-NtGdiResetDC-Use-After-Free-Local-Privilege-Escalation.html.