Microsoft has released the KB5004945 emergency security update to fix the PrintNightmare zero-day vulnerability in the Windows Print Spooler service. However, the patch is incomplete and the vulnerability can still be locally exploited to gain SYSTEM privileges. Microsoft urges customers to install these out-of-band security updates immediately to address the vulnerability. Security researcher Matthew Hickey verified that the patch only fixes the RCE and not the LPE component. The fix is available for Windows 10 version 1607, Windows Server 2016, or Windows Server 2012, but they will also be released soon.
Source: https://www.bleepingcomputer.com/news/security/microsoft-pushes-emergency-update-for-windows-printnightmare-zero-day/