Improvements and fixes
This security update includes improvements and fixes that were a part of update KB4338831 (released July 18, 2018) and addresses the following issues:
- 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.)
- Ensures that Internet Explorer and Microsoft Edge support the preload="none" tag.
- Addresses an issue that may prevent your device from starting up properly if you install KB3033055 (released September 2015) after installing any Monthly Rollup dated November 2017 or later.
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.