Cumulative Update KB4515384 Windows 10 v1903 build 18362.356 Sept. 10 Win Update

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    Cumulative Update KB4515384 Windows 10 v1903 build 18362.356 Sept. 10

    Cumulative Update KB4515384 Windows 10 v1903 build 18362.356 Sept. 10

    Category: Win Update
    Last Updated: 23 Sep 2019 at 12:46

    UPDATE 9/23: Cumulative Update KB4522016 Windows 10 v1903 build 18362.357 Sept. 23

    September 10, 2019 - KB4515384 (OS Build 18362.356)

    Applies to: Windows 10 version 1903, Windows Server version 1903

    Note Follow @WindowsUpdate to find out when new content is published to the release information dashboard.

    Note This release also contains updates for Microsoft HoloLens (OS Build 18362.1031) released September 10, 2019. Microsoft will release an update directly to the Windows Update Client to improve Windows Update reliability on Microsoft HoloLens that have not updated to this most recent OS Build.

    ePub support ending in Microsoft Edge
    Microsoft Edge will end support for e-books that use the .epub file extension over the next several months. For more information, see Download an ePub app to keep reading e-books.

    For more information about the various types of Windows updates, such as critical, security, driver, service packs, and so on, please see the following article.


    • Updates to improve security when using Internet Explorer, Microsoft Edge, networking technologies, and input devices such as a mouse, keyboard, or stylus.
    • Updates for verifying user names and passwords.
    • Updates for storing and managing files.

    Improvements and fixes

    This security update includes quality improvements. Key changes include:

    • 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 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.

    Windows Update Improvements
    Microsoft has released an update directly to the Windows Update client to improve reliability. Any device running Windows 10 configured to receive updates automatically from Windows Update, including Enterprise and Pro editions, will be offered the latest Windows 10 feature update based on device compatibility and Windows Update for Business deferral policy. This doesn't apply to long-term servicing editions.

    Known issues in this update

    Symptom Workaround
    [ADDED 9/13] Microsoft has received reports that audio in certain games is quieter or different than expected after installing this update. At the request of some of our audio partners, we implemented a compatibility change that enabled certain games to query support and render multi-channel audio. Due to customer feedback, we are reverting this change as some games and some devices are not rendering multi-channel audio as expected. This may result in games sounding different than customers are used to and may have missing channels. To mitigate the issue, open settings in the impacted game and disable multi-channel audio, if this option is available. You can also search in the Windows Control Panel for third-party audio device control panels and disable Multi-channel audio or Virtual Surround Sound, if these options are available.

    We are working on a resolution and estimate a solution will be available in late September.
    [UPDATED 9/20] Some Input Method Editor (IME) may become unresponsive or may have high CPU usage. Affected IMEs include Chinese Simplified ([ChsIME.EXE) and Chinese Traditional ([ChtIME.EXE) with Changjie/Quick keyboard. Due to security related changes in this update, this issue may occur when the Touch Keyboard and Handwriting Panel Service is not configured to its default startup type of Manual. To resolve the issue, perform the following steps:

    1. Select the Start button and type “services”.
    2. Open the Services app and locate Touch Keyboard and Handwriting Panel Service.
    3. Double-click Touch Keyboard and Handwriting Panel Service and select Properties.
    4. Locate Startup type: and change it to Manual.
    5. Select Ok.

    The TabletInputService service is now in the default configuration and IME should work as expected.

    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.

    If you are using Windows Update, the latest SSU (KB4515383) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

    Install this update

    Release Channel Available Next Step
    Windows Update and Microsoft Update Yes None. This update will be downloaded and installed automatically from Windows Update.
    Microsoft Update Catalog Yes To get the standalone package for this update, go to the Microsoft Update Catalog website.
    Windows Server Update Services (WSUS) Yes This update will automatically synchronize with WSUS if you configure Products and Classifications as follows:
    Product: Windows 10, version 1903 and later
    Classification: Security Updates


    Direct download links for KB4515384 MSU file from Microsoft Update Catalog:

    Download KB4515384 MSU for Windows 10 v1903 32-bit (x86) - 115.9 MB

    Download KB4515384 MSU for Windows 10 v1903 64-bit (x64) - 263.5 MB

    Download KB4515384 MSU for Windows 10 v1903 ARM64 - 286.0 MB

    Brink's Avatar Posted By: Brink
    10 Sep 2019

  1. Posts : 19,207
    W11+W11 Developer Insider + Linux

    Aaaand done:
    Cumulative Update KB4515384 Windows 10 v1903 build 18362.356 Sept. 10-image.png
      My Computers

  2. Posts : 2,753
    Windows 10 Home x64

    It just got installed while I was playing. Now waiting for reboot.
      My Computer

  3. Posts : 46,432
    Windows 10 Home 64bit 21H1 and insider builds

    I didn't see the msrt this month.
      My Computer

  4. Posts : 814
    Windows 10 Pro 64bit 21H2 19044.1706

    Not sure how widespread this is...

    Update: Had to hammer 6 times on this 'try again' error message for my Desktop to update. Also, Windows Update Delivery Optimization did not go to my previously updated Laptop for this KB4515384 CU like it has in the past?

    CountMike said:
    Aren't we supposed to get an update today ?
    Attachment 246916
    Bad or good sign ?

    Farvatten said:
    I got this error at 10:01 PST 2 times in a row but then it finally connected and is downloading on the charms of my 3rd time. ;o)
    Attachment 246921
    Last edited by Farvatten; 10 Sep 2019 at 12:54. Reason: Desktop updating issues
      My Computers

  5. Posts : 128
    Windows 11 Pro 64bit (Insider Builds)

    kado897 said:
    I didn't see the msrt this month.
    I noticed the same thing on my RP 19H2 build.
      My Computer

  6. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter

    Cumulative Update KB4515384 Windows 10 v1903 build 18362.356 Sept. 10-kb4515384.jpg
      My Computers

  7. Posts : 1,902
    Windows 10 Pro x64

    Went very fast and all fine.............
      My Computer

  8. Posts : 187
    Windows 10

    Downloaded and installed smoothly, knock on wood. :)

    The sfc scannow even reported no errors.
      My Computer

  9. Posts : 504
    Win10 20236.1000 64bit Pro and Win7 SP1 Ultimate

    It took 15 minutes...the first time it installed twice without .NET and Adobe. Then it rebooted and I ran WU again and .NET and Flash was updated and it required another reboot. It is at 18363.356 now and Flash is at That's the first time it happened in reverse.

      My Computers


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