This security update includes quality improvements. No new operating system features are being introduced in this update. Important changes include the following:
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.
Symptom | Workaround |
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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. |
A Stop error occurs if this update is applied to a 32-Bit (x86) computer that has the Physical Address Extension (PAE) mode disabled. | This issue is resolved in KB4093108. |
A Stop error occurs on computers that don’t support Streaming Single Instructions Multiple Data (SIMD) Extensions 2 (SSE2). | Upgrade your machines with a processor that supports SSE2 or virtualize those machines. |
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 you apply this update, a new Ethernet Network Interface Card (NIC) that has default settings may replace the previous NIC and cause network issues. Any custom settings on the previous NIC persist in the registry but aren’t used. | This issue can be resolved by installing KB4099950 prior to this update. |
Static IP address settings are lost after you apply this update. | This issue can be resolved by installing KB4099950 prior to this update. |
After you install this update, you may receive a Stop error message that resembles the following when you log off the computer: |
SESSION_HAS_VALID_POOL_ON_EXIT (ab)
| To resolve this issue, apply update KB4099467.
A 32-bit (x86) computer won’t boot or keeps restarting after applying this security update.| Before applying this security update and subsequent security updates, uninstall the following external drivers until they are fixed by the vendor that owns them:
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 4088878.