January 3, 2018—KB4056897 (Security-only update)

Improvements and fixes

This security update includes quality improvements. No new operating system features are introduced in this update. Key changes include the following:

• Security updates to Microsoft Graphics Component, Windows Graphics, Windows Kernel, and Windows SMB Server.
  For more information about the resolved security vulnerabilities, see the Security Update Guide.

Notes

ImportantPlease apply KB4100480 immediately after applying this update. KB4100480 resolves an elevation of privilege vulnerability in the Windows Kernel for the 64-Bit (x64) version of Windows. This vulnerability is documented in CVE-2018-1038.

Known issues in this update

To prevent this issue, Microsoft will temporarily pause Windows OS updates to devices with impacted AMD processors at this time.| This issue is resolved in KB4073578.
Because of an issue that affects some versions of antivirus software, this fix applies only to computers on which the antivirus ISV updated the ALLOW REGKEY.| This issue is resolved in KB4093108. You no longer need the following ALLOW REGKEY to detect and be offered this update: HKEY_LOCAL_MACHINE"Subkey="SOFTWARE\Microsoft\Windows\CurrentVersion\QualityCompat\cadca5fe-87d3-4b96-b7fb-a231484277cc
After installing KB4056897 or any other recent monthly updates, SMB servers may experience a memory leak for some scenarios. This occurs when the requested path traverses a symbolic link, mount point, or directory junction and the registry key is set to 1: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\LanManServer\Parameters\EnableEcp| This issue is resolved in KB4103718.

How to get this update

This update is now available for installation through WSUS. To get the standalone package for this update, go to the Microsoft Update Catalog website.File informationFor a list of the files that are provided in this update, download the file information for update 4056897.