Microsoft Releases October Patch Tuesday Updates For Windows 10

KB4579311 for Windows 10 version 2004 May 2020 Update

For Windows 10 version 2004 May 2020 Update today’s cumulative updates come as KB4579311. It includes the following highlights:

Updates to improve security when using Microsoft Office products.Updates for verifying usernames and passwords.Updates to improve security when Windows performs basic operations.

Here is the list of fixes and improvements:

Addresses an issue with a possible elevation of privilege in win32k.Addresses an issue with the Group Policy service that might recursively delete critical files in alphabetic order from %systemroot%\systm32. This issue occurs when a policy has been configured to delete cached profiles. These file deletions might cause stop error “0x5A (CRITICAL_SERVICE_FAILED)” boot failures.Addresses an issue with creating null ports using the user interface.Security updates to Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Media, Windows Fundamentals, Windows Authentication, Windows Virtualization, and Windows Kernel.

KB4577671 for Windows 10 1903 and 1909

If you’re running Windows 10 version 1909 or 1903 your update comes in the form of KB4577671 and it includes the following highlights:

Updates to improve security when using Microsoft Office products.Updates for verifying usernames and passwords.Updates to improve security when Windows performs basic operations.Updates for storing and managing files.

And it includes the following quality improvements:

Addresses an issue with a possible elevation of privilege in win32k.Addresses an issue with the Group Policy service that might recursively delete critical files in alphabetic order from %systemroot%\systm32. This issue occurs when a policy has been configured to delete cached profiles. These file deletions might cause stop error “0x5A (CRITICAL_SERVICE_FAILED)” boot failures.Addresses an issue with creating null ports using the user interface.Security updates to Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Media, Windows Shell, Windows Cloud Infrastructure, Windows Fundamentals, Windows Authentication, Windows Virtualization, Windows Kernel, and Windows Storage and Filesystems.

If automatic updates enabled on your system, you should see the new updates in the next couple of days. Or, you can stay on top of things by manually heading to Settings > Update & Security > Microsoft Update to check. Older versions of Windows 10 are getting updates today as well. Make sure to read the documentation on the Windows 10 Update History page for your version’s full release notes. If something breaks after you install today’s updates and cannot be resolved with resolved by Microsoft’s documented workarounds you can roll them back. For more on how to do that, makes sure to read our article: How to Uninstall a Windows 10 Cumulative Update.