August 14, 2018 - KB4343888 (Security-only update)
Applies to: Windows 8.1Windows Server 2012 R2
Improvements and fixes
This security update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:
- Provides protections against a new speculative execution side-channel vulnerability known as L1 Terminal Fault (L1TF) that affects Intel® Core® processors and Intel® Xeon® processors (CVE-2018-3620 and CVE-2018-3646). Make sure previous OS protections against Spectre Variant 2 and Meltdown vulnerabilities are enabled using the registry settings outlined in the Windows Client and Windows Server guidance KB articles. (These registry settings are enabled by default for Windows Client OS editions, but disabled by default for Windows Server OS editions.)
For more information about the resolved security vulnerabilities, see the
Security Update Guide.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
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 information
For a list of the files that are provided in this update, download the
file information for update 4343888.
Download KB4343888 MSU for Windows 8.1 32-bit (x86) - 19.2 MB