System becomes unresponsive when file system minifilter drivers are installed in Windows 8 or Windows Server 2012

This article describes a memory leak issue that occurs when one or more file system minifilter drivers are installed in Windows 8 or Windows Server 2012. A hotfix is available to fix this issue. Before you apply this hotfix, note that this hotfix has a known issue.
Known issue in this hotfix


If you install hotfix KB2979933 in Windows Server 2012, and then install this hotfix (KB3084426), the fix for hotfix KB2979933 is lost.


To fix this issue, install October 2016 update rollup for Windows Server 2012.

Hotfix information

Important If you install a language pack after you install this hotfix, you must reinstall this hotfix. Therefore, we recommend that you install any language packs that you need before you install this hotfix. For more information, see Add language packs to Windows.

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that's described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there's a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section doesn't appear, submit a request to Microsoft Customer Service and Support to get the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that don't qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you don't see your language, it's because a hotfix isn't available for that language.


There's no prerequisite to apply this hotfix.

Registry information

To use the hotfix in this package, you don't have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix doesn't replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 8 and Windows Server 2012 file information and notes

Important Windows 8 hotfixes and Windows Server 2012 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that's listed under "Windows 8/Windows Server 2012" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
    Version Product Milestone Service branch
    6.2.920 0.21xxxWindows 8 and Windows Server 2012RTMLDR
  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes aren't listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 8
File nameFile versionFile sizeDateTimePlatform
For all supported x64-based versions of Windows 8 and of Windows Server 2012
File nameFile versionFile sizeDateTimePlatform

Additional file information

Additional file information for Windows 8 and for Windows Server 2012
Additional files for all supported x86-based versions of Windows 8
File propertyValue
File nameX86_bbc0e96f1748898dfa45c355931fdf52_31bf3856ad364e35_6.2.9200.21618_none_a633701aae091c88.manifest
File versionNot applicable
File size706
Date (UTC)09-Sep-2015
Time (UTC)23:19
PlatformNot applicable
File nameX86_microsoft-windows-filtermanager-core_31bf3856ad364e35_6.2.9200.21618_none_0e8db93e15142bc4.manifest
File versionNot applicable
File size10,644
Date (UTC)09-Sep-2015
Time (UTC)14:33
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 8 and of Windows Server 2012
File propertyValue
File nameAmd64_a2aa0b235abe7a66053e510ebb1080df_31bf3856ad364e35_6.2.9200.21618_none_60ac860b0d73bd1a.manifest
File versionNot applicable
File size710
Date (UTC)09-Sep-2015
Time (UTC)23:19
PlatformNot applicable
File nameAmd64_microsoft-windows-filtermanager-core_31bf3856ad364e35_6.2.9200.21618_none_6aac54c1cd719cfa.manifest
File versionNot applicable
File size10,648
Date (UTC)09-Sep-2015
Time (UTC)15:42
PlatformNot applicable

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
See the terminology that Microsoft uses to describe software updates.

Article ID: 3084426 - Last Review: 10/20/2016 03:06:00 - Revision: 4.0

Windows Server 2012 Datacenter, Windows Server 2012 Standard, Windows Server 2012 Essentials, Windows Server 2012 Foundation, Windows 8 Enterprise, Windows 8 Pro, Windows 8

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