None For information about Windows update terminology, see the article about the [types of Windows updates](<https://docs.microsoft.com/troubleshoot/windows-client/deployment/standard-terminology-software-updates>) and the [monthly quality update types](<https://techcommunity.microsoft.com/t5/windows-it-pro-blog/windows-quality-updates-primer/ba-p/2569385>). For an overview of Windows 11 (original release), see its update history page.**Note **Follow [@WindowsUpdate](<https://twitter.com/windowsupdate>) to find out when new content is published to the release information dashboard. ![Your browser does not support video. Install Microsoft Silverlight, Adobe Flash Player, or Internet Explorer 9.](https://support.content.office.net/en-us/media/4873755a-8b1e-497e-bc54-101d1e75d3e7.png) ## Highlights * Updates security for your Windows operating system. ## Improvements and fixes This security update includes quality improvements. Key changes include: * Addresses known compatibility issues between some Intel “Killer” and “SmartByte” networking software and Windows 11 (original release). Devices with the affected software might drop User Datagram Protocol (UDP) packets under certain conditions. This creates performance and other issues for protocols based on UDP. For example, some websites might load slower than others on the affected devices, which might cause videos to stream slower in certain resolutions. VPN solutions based on UDP might also be slower. 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](<https://msrc.microsoft.com/update-guide>) website and the [October 2021 Security Updates](<https://msrc.microsoft.com/update-guide/releaseNote/2021-Oct>). ### Windows 11 servicing stack update - 22000.190 * This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. ## Known issues in this update ## __ Click or tap to view the known issues **Applies to**| **Symptom**| **Workaround** ---|---|--- IT admins| Devices that attempt to connect to a network printer for the first time might fail to download and install the necessary printer drivers.This issue has been observed in devices that access printers using a print server, using HTTP connections. When a client connects to the server to install the printer, a directory mismatch occurs, which causes the installer files to generate incorrectly. As a result, the drivers may not download.**Note** The printer connection methods described in this issue are not commonly used by devices designed for home use. The printing environments affected by this issue are more commonly found in enterprises and organizations.| This issue is resolved in KB5006746. IT admins| Installation of printers using Internet Printing Protocol (IPP) might not complete successfully.**Note **IPP is not commonly used by devices designed for home use. The printing environments affected by this issue are more commonly found in enterprises and organizations.| This issue is resolved in KB5006746. IT admins| Printing properties defined on a server might not be correctly provided to clients. Note this issue is specific to print servers and does not impact standard network printing. This issue will not cause printing operations to fail, however, custom settings defined on the server – for example, duplex print settings – will not be applied automatically, and clients will print with default settings only.This issue results from an improper building of the data file which contains the printer properties. Clients which receive this data file will not be able to use the file content and will instead proceed with default printing settings. Servers which use default print settings and have no custom settings to provide to clients are unaffected.**Note** The printer connection methods described in this issue are not commonly used by devices designed for home use. The printing environments affected by this issue are more commonly found in enterprises and organizations.| This issue is resolved in KB5006746. IT admins| You might receive a prompt for administrative credentials every time you attempt to print in environments in which the print server and print client are in different times zones.**Note** The affected environments described in this issue are not commonly used by devices designed for home use. The printing environments affected by this issue are more commonly found in enterprises and organizations.| This issue is resolved in KB5006746. IT admins| After installing this update, Windows print clients might encounter the following errors when connecting to a remote printer shared on a Windows print server: * 0x000006e4 (RPC_S_CANNOT_SUPPORT) * 0x0000007c (ERROR_INVALID_LEVEL) * 0x00000709 (ERROR_INVALID_PRINTER_NAME) **Note** The printer connection issues described in this issue are specific to print servers and are not commonly observed in devices designed for home use. Printing environments affected by this issue are more commonly found in enterprises and organizations.| This issue is resolved in KB5007262. All users| After installing Windows 11, some image editing programs might not render colors correctly on certain high dynamic range (HDR) displays. This is frequently observed with white colors, which could display in bright yellow or other colors.This issue occurs when certain color-rendering Win32 APIs return unexpected information or errors under specific conditions. Not all color profile management programs are affected, and color profile options available in the Windows 11 Settings page, including Microsoft Color Control Panel, are expected to function correctly.| This issue is resolved in KB5008353. All users| Recent emails might not appear in the search results of the Microsoft Outlook desktop app. This issue is related to emails that have been stored locally in a PST or OST files. It might affect POP and IMAP accounts, as well as accounts hosted on Microsoft Exchange and Microsoft 365. If the default search in the Microsoft Outlook app is set to server search, the issue will only affect the advanced search.| This issue is resolved in KB5010386. All users| When attempting to reset a Windows device with apps that have folders with [reparse data](<https://docs.microsoft.com/windows/win32/fileio/reparse-points>), such as OneDrive or OneDrive for Business, files which have been downloaded or synced locally from OneDrive might not be deleted when selecting the “Remove everything” option. This issue might be encountered when attempting a [manual reset initiated within Windows](<https://support.microsoft.com/windows/recovery-options-in-windows-31ce2444-7de3-818c-d626-e3b5a3024da5#bkmk_win11_reset_pc>) or a remote reset. Remote resets might be initiated from Mobile Device Management (MDM) or other management applications, such as [Microsoft Intune](<https://docs.microsoft.com/mem/intune/remote-actions/device-fresh-start>) or third-party tools. OneDrive files that are “cloud only” or have not been downloaded or opened on the device are not affected and will not persist, as the files are not downloaded or synced locally.**Note** Some device manufacturers and some documentation might call the feature to reset your device, "Push Button Reset", "PBR", "Reset This PC", "Reset PC", or "Fresh Start".| This issue was addressed in KB5011493. Some devices might take up to seven (7) days after the installation of KB5011493 to fully address the issue and prevent files from persisting after a reset. For immediate effect, you can manually trigger Windows Update Troubleshooter using the instructions in [Windows Update Troubleshooter](<https://support.microsoft.com/windows/windows-update-troubleshooter-19bc41ca-ad72-ae67-af3c-89ce169755dd>). If you are part of an organization that manages devices or prepared OS images for deployment, you can also address this issue by applying a compatibility update for installing and recovering Windows. Doing that makes improvements to the "safe operating system" (SafeOS) that is used to update the Windows recovery environment (WinRE). You can deploy these updates using the instructions in [Add an update package to Windows RE](<https://docs.microsoft.com/windows-hardware/manufacture/desktop/add-update-to-winre?view=windows-11>) using [KB5012414](<https://support.microsoft.com/help/5012414>) for Windows 11 (original release).**Important **If devices have already been reset and OneDrive files have persisted, you must use a workaround above or perform another reset after applying one of the workarounds above. ## How to get this update **Before installing this update**Microsoft combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see [Servicing stack updates](<https://docs.microsoft.com/windows/deployment/update/servicing-stack-updates>) and [Servicing Stack Updates (SSU): Frequently Asked Questions](<https://support.microsoft.com/topic/servicing-stack-updates-ssu-frequently-asked-questions-06b62771-1cb0-368c-09cf-87c4efc4f2fe>).**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. Windows Update for Business| Yes| None. This update will be downloaded and installed automatically from Windows Update in accordance with configured policies. Microsoft Update Catalog| Yes| To get the standalone package for this update, go to the [Microsoft Update Catalog](<https://www.catalog.update.microsoft.com/Search.aspx?q=KB5006674>) website. Windows Server Update Services (WSUS)| Yes| This update will automatically sync with WSUS if you configure **Products and Classifications** as follows:**Product**: Windows 11**Classification**: Security Updates **If you want to remove the LCU**To remove the LCU after installing the combined SSU and LCU package, use the [DISM/Remove-Package](<https://docs.microsoft.com/windows-hardware/manufacture/desktop/dism-operating-system-package-servicing-command-line-options>) command line option with the LCU package name as the argument. You can find the package name by using this command: **DISM /online /get-packages**.Running [Windows Update Standalone Installer](<https://support.microsoft.com/topic/description-of-the-windows-update-standalone-installer-in-windows-799ba3df-ec7e-b05e-ee13-1cdae8f23b19>) (**wusa.exe**) with the **/uninstall **switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation. **File information**For a list of the files that are provided in this update, download the [file information for cumulative update 5006674](<https://download.microsoft.com/download/8/a/e/8ae7faee-ef96-49a3-8bf0-b435d6ee161c/5006674.csv>). For a list of the files that are provided in the servicing stack update, download the [file information for the SSU - version 22000.190](<https://download.microsoft.com/download/3/b/8/3b8392a7-e470-40b3-b19c-2b34eaca1c8c/SSU_version_22000_190.csv>).
Microsoft Windows storport Integer Overflow Privilege Escalation Vulnerability
KB5006675: WWindows 10 version 1507 LTS Security Update (October 2021)
KB5006669: Windows 10 Version 1607 and Windows Server 2016 Security Update (October 2021)
KB5006667: Windows 10 version 1909 Security Update (October 2021)
KB5006672: Windows 10 Version 1809 and Windows Server 2019 Security Update (October 2021)
KB5006670: Windows 10 Version 2004 / Windows 10 Version 20H2 / Windows 10 Version 21H1 October 2021 Security Update
Patch Tuesday - October 2021