This indicates an attack attempt to exploit a Privilege Escalation vulnerability in Microsoft Windows.
The vulnerability is due to an error when the Windows kernel-mode driver fails to properly handle objects in memory. A remote attacker may be able to exploit this to leverage their privileges on vulnerable systems.
Windows Server 2008 R2
Windows Server 2012 and Windows Server 2012 R2
Windows RT 8.1
Windows Server 2016
Server Core installation option
Privilege Escalation: Remote attackers can leverage their privileges on vulnerable systems.
Apply the most recent upgrade or patch from the vendor.