Memory leak in RPCSS and DcomLaunch services in Windows 8.1 or Windows Serer 2012 R2

This article describes an issue in which memory leak occurs in Windows remote procedure call service (RPCSS) and DCOM Server Process Launcher (DcomLaunch) services in Windows 8.1, Windows RT 8.1, or Windows Server 2012 R2. Before you install this update, see the Prerequisites section.
How to get this update
Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is provided as a Recommended update on Windows Update. For more information on how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Download Center

The following files are available for download from the Microsoft Download Center:
Operating systemUpdate
All supported x86-based versions of Windows 8.1DownloadDownload the package now.
All supported x64-based versions of Windows 8.1 DownloadDownload the package now.
All supported x64-based versions of Windows Server 2012 R2DownloadDownload the package now.
Note The update for Windows RT 8.1 can be got only from Windows Update.

For more information about how to download Microsoft support files, select the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
Update detail information

Prerequisites

To install this update, you should first install April 2014, update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) in Windows 8.1 or Windows Server 2012 R2.

Registry information

To apply this update, you don't have to make any changes to the registry.

Restart requirement

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

Update replacement information

This update doesn't replace a previously released update.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
File Information
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables.

Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2

Notes
  • 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:
    VersionProductMilestoneService branch
    6.3.960 0.18 xxxWindows RT 8.1, Windows 8.1, and Windows Server 2012 R2RTMGDR
  • 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 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 are not listed, are signed with a Microsoft digital signature.
x64 Windows 8.1 and Windows Server 2012 R2
File nameFile versionFile sizeDateTimePlatform
Rpcss.dll6.3.9600.18220817,66427-Jan-201615:18x64
Windows RT 8.1
File nameFile versionFile sizeDateTimePlatform
Rpcss.dll6.3.9600.18220526,84827-Jan-201616:29Not applicable
x86 Windows 8.1
File nameFile versionFile sizeDateTimePlatform
Rpcss.dll6.3.9600.18220642,56028-Jan-201601:00x86

Additional file information

x64 Windows 8.1 and Windows Server 2012 R2
File propertyValue
File nameAmd64_fb56c51f71020503d4060fcef2c6667d_31bf3856ad364e35_6.3.9600.18220_none_fa71f9d167e00fd6.manifest
File versionNot applicable
File size710
Date (UTC)28-Jan-2016
Time (UTC)07:02
PlatformNot applicable
File nameAmd64_microsoft-windows-com-base-qfe-rpcss_31bf3856ad364e35_6.3.9600.18220_none_5ac5eaf111aa2dc9.manifest
File versionNot applicable
File size2,044
Date (UTC)27-Jan-2016
Time (UTC)18:34
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,583
Date (UTC)28-Jan-2016
Time (UTC)07:02
PlatformNot applicable
Windows RT 8.1
File propertyValue
File nameArm_9d13d56733be40284724f9d757574f33_31bf3856ad364e35_6.3.9600.18220_none_588dc3d8074463fb.manifest
File versionNot applicable
File size706
Date (UTC)28-Jan-2016
Time (UTC)07:02
PlatformNot applicable
File nameArm_microsoft-windows-com-base-qfe-rpcss_31bf3856ad364e35_6.3.9600.18220_none_fea9c1c55949db59.manifest
File versionNot applicable
File size2,042
Date (UTC)27-Jan-2016
Time (UTC)17:47
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,575
Date (UTC)28-Jan-2016
Time (UTC)07:02
PlatformNot applicable
x86 Windows 8.1
File propertyValue
File nameUpdate.mum
File versionNot applicable
File size1,575
Date (UTC)28-Jan-2016
Time (UTC)07:02
PlatformNot applicable
File nameX86_b85cf13a8383b0fdb97f595957917445_31bf3856ad364e35_6.3.9600.18220_none_420850b1285c7e43.manifest
File versionNot applicable
File size706
Date (UTC)28-Jan-2016
Time (UTC)07:02
PlatformNot applicable
File nameX86_microsoft-windows-com-base-qfe-rpcss_31bf3856ad364e35_6.3.9600.18220_none_fea74f6d594cbc93.manifest
File versionNot applicable
File size2,042
Date (UTC)28-Jan-2016
Time (UTC)02:52
PlatformNot applicable
Properties

Article ID: 3134785 - Last Review: 04/12/2016 20:15:00 - Revision: 2.0

Windows Server 2012 R2 Datacenter, Windows Server 2012 R2 Standard, Windows Server 2012 R2 Essentials, Windows Server 2012 R2 Foundation, Windows 8.1 Enterprise, Windows 8.1 Pro, Windows 8.1, Windows RT 8.1

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