Improvements and fixes
This update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:
- Provides protections against an additional subclass of speculative execution side-channel vulnerability known as Speculative Store Bypass (CVE-2018-3639) for AMD-based computers. These protections aren't enabled by default. For Windows client (IT pro) guidance, follow the instructions in KB4073119. For Windows Server guidance, follow the instructions in KB4072698. Use these guidance documents to enable mitigations for Speculative Store Bypass (CVE-2018-3639). Additionally, use the mitigations that have already been released for Spectre Variant 2 (CVE-2017-5715) and Meltdown (CVE-2017-5754).
- Security updates to Windows Scripting, Internet Explorer, Microsoft Edge, Windows Media, Windows Graphics, Windows App Platform and Frameworks, Windows Server, Windows Kernel, and Windows Virtualization and Kernel .
If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.
For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.
Known issues in this update
After you install the August Preview of Quality Rollup or September 11, 2018 .NET Framework update, instantiation of SqlConnection can throw an exception. For more information about this issue, see the following article in the Microsoft Knowledge Base:
4470809 SqlConnection instantiation exception on .NET 4.6 and later after August-September 2018 .NET Framework updates.
|Microsoft is working on a resolution and will provide an update in an upcoming release.|
|After installing this update, users may not be able to use the Seek Bar in Windows Media Player when playing specific files. This issue does not affect normal playback.||This issue is resolved in KB4471329.|
How to get this update
Before installing this update
Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security fixes. For more information, see Servicing stack updates.
Install this update
This update will be downloaded and installed automatically from Windows Update. To get the stand-alone package for this update, go to the Microsoft Update Catalog website.
For a list of the files that are provided in this update, download the file information for cumulative update 4467686.