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Microsoft Releases September 2019 Patch Tuesday Updates for Windows 10

By Brian Burgess

Updated March 7, 2024

It’s Patch Tuesday for September and Microsoft today is rolling out cumulative updates for all currently supported versions of Windows 10. Here’s a look at what to expect.

Microsoft today is releasing new cumulative updates for all supported versions of Windows 10. If you are running the latest version, Windows 10 1903, aka “May 2019 Update,” your patch will come in the form of KB4515384. It includes a number of security fixes and system improvements. Namely, a fix for high CPU spikes caused by a previous update — KB4512941 — on systems with the “Search the Web” disabled for desktop search. All other supported versions of Windows 10 are getting updates today as well — sans version 1511.

KB4515384 for Windows 10 1903 May 2019 Update

As is usually the case for cumulative updates, there are no new features to report. But today’s update will bump your build to 18362.356, and it includes the following fixes and improvements:

• Provides protections against a new subclass of speculative execution side-channel vulnerabilities, known as Microarchitectural Data Sampling, for 32-Bit (x86) versions of Windows (CVE-2019-11091, CVE-2018-12126, CVE-2018-12127, CVE-2018-12130). Use the registry settings as described in the Windows Client and Windows Server articles. (These registry settings are enabled by default for Windows Client OS editions and Windows Server OS editions.)
• Addresses an issue that causes high CPU usage from SearchUI.exe for a small number of users. This issue only occurs on devices that have disabled searching the web using Windows Desktop Search.
• Security updates to Microsoft Edge, Internet Explorer, Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Input and Composition, Windows Media, Windows Fundamentals, Windows Authentication, Windows Cryptography, Windows Datacenter Networking, Windows Storage and Filesystems, Windows Wireless Networking, the Microsoft JET Database Engine, Windows Kernel, Windows Virtualization, and Windows Server.

If you have automatic updates enabled, you should see the updates in the next couple of days. Or, if you want to stay on top of things (and are having the CPU spiking issue), head to Settings > Update & Security > Microsoft Update and check. You can also manually install it by downloading it from the Microsoft Update Catalog.  Remember, a full system restart is required to complete the installation process.

Remember that older supported versions of Windows 10 are receiving patches today, too. Also, keep in mind that there are a few known issues with these updates, which vary depending on the version of the version you’re running. Make sure to read Microsoft’s Windows 10 Update History page for release notes for your version.

If you have issues that remain unresolved by Microsoft’s documented workarounds, you can roll the update back. For more information on how to do that, read our article on how to uninstall Windows 10 cumulative updates.