Over the weekend Microsoft released a Unscheduled emergency fix on Windows 10, to fix a bug that caused applications to crash and freeze. The problem was in turn caused by the release of cumulative updates KB5005565 and KB5005101 preview occurred during Patch Tuesday in September, the same for which some problems with network printing were reported.
The problems have only occurred to users using the feature Microsoft Exploit Protection Export Address Filtering (EAF), useful for detecting malicious operations launched by malicious code or exploit modules. Microsoft explained that users can recognize the problem with “applications not running correctly, files that cannot be opened or with a blank screen when trying to log in”.
The fix was released using the feature Known Issue Rollback (KIR), designed to serve updates not related to security, but designed to specifically resolve individual bugs introduced with previous updates. The company warned that automatic distribution of the fix could take up to 24 hours, on both consumer systems and unmanaged enterprise systems. A reboot is recommended to force the patch to be applied.
Windows 10, Microsoft solves crashes and freezes introduced with the latest updates
Microsoft has also released updated Group Policies that users can install to apply fixes in the various versions involved. It is absolutely necessary to install the correct .msi file for the version of Windows running on the system in order to avoid potentially serious problems:
These fixes are also distributed via Windows Update automatically, however it should be noted that they are not released as traditional patches. Microsoft distributes them by creating new entries in the Windows Registry that disable changes made with previous updates.