Summary

This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker logs on to a targeted system and runs a specially crafted application that, by way of a race condition, results in references to memory locations that have already been freed.  

To learn more about the vulnerability, see Microsoft Security Bulletin MS15-133.

More Information

Important

  • All future security and nonsecurity updates for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your Windows RT 8.1-based, Windows 8.1-based, or Windows Server 2012 R2-based computer so that you receive future updates.

  • 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.

More information about this security update

The following articles contain more information about this security update as it relates to individual product versions. The articles may contain known issue information.

  • 3109103 MS15-133: Description of the security update for Windows PGM: December 8, 2015

  • 3116869 Cumulative update for Windows 10: December 8, 2015

  • 3116900 Cumulative update for Windows 10 Version 1511: December 8, 2015

How to obtain and install the update

Method 1: Windows Update

This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see
Get security updates automatically.

Note For Windows RT and Windows RT 8.1, this update is available through Windows Update only.

You can obtain the stand-alone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.

Click the download link in Microsoft Security Bulletin MS15-133 that corresponds to the version of Windows that you are running.

More Information

Windows Vista (all editions)Reference table

The following table contains the security update information for this software.

Security update file names

For all supported 32-bit editions of Windows Vista:
Windows6.0-KB3109103-x86.msu

For all supported x64-based editions of Windows Vista:



Windows6.0-KB3109103-x64.msu

Installation switches

See Microsoft Knowledge Base Article 934307

Restart requirement

A system restart is required after you apply this security update.

Removal information

WUSA.exe does not support uninstall of updates. To uninstall an update that is installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates, and then select from the list of updates.

File information

See Microsoft Knowledge Base Article 3109103

Registry key verification

Note A registry key does not exist to validate the presence of this update.

Windows Server 2008 (all editions)Reference table

The following table contains the security update information for this software.

Security update file names

For all supported 32-bit editions of Windows Server 2008:
Windows6.0-KB3109103-x86.msu

For all supported x64-based editions of Windows Server 2008:
Windows6.0-KB3109103-x64.msu

For all supported Itanium-based editions of Windows Server 2008:
Windows6.0-KB3109103-ia64.msu

Installation switches

See Microsoft Knowledge Base Article 934307

Restart requirement

A system restart is required after you apply this security update.

Removal information

WUSA.exe does not support uninstall of updates. To uninstall an update that is installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates, and then select from the list of updates.

File information

See Microsoft Knowledge Base Article 3109103

Registry key verification

Note A registry key does not exist to validate the presence of this update.

Windows 7 (all editions)Reference table

The following table contains the security update information for this software.

Security update file name

For all supported 32-bit editions of Windows 7:
Windows6.1-KB3109103-x86.msu

For all supported x64-based editions of Windows 7:
Windows6.1-KB3109103-x64.msu

Installation switches

See Microsoft Knowledge Base Article 934307

Restart requirement

A system restart is required after you apply this security update.

Removal information

To uninstall an update that is installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, and then under Windows Update, click View installed updates, and select from the list of updates.

File information

See Microsoft Knowledge Base Article 3109103

Registry key verification

Note A registry key does not exist to validate the presence of this update.

Windows Server 2008 R2 (all editions)Reference table

The following table contains the security update information for this software.

Security update file name

For all supported x64-based editions of Windows Server 2008 R2:
Windows6.1-KB3109103-x64.msu

For all supported Itanium-based editions of Windows Server 2008 R2:
Windows6.1-KB3109103-ia64.msu

Installation switches

See Microsoft Knowledge Base Article 934307

Restart requirement

A system restart is required after you apply this security update.

Removal information

To uninstall an update that is installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, and then under Windows Update, click View installed updates, and select from the list of updates.

File information

See Microsoft Knowledge Base Article 3109103

Registry key verification

Note A registry key does not exist to validate the presence of this update.

Windows 8 and Windows 8.1 (all editions)Reference table

The following table contains the security update information for this software.

Security update file name

For all supported 32-bit editions of Windows 8:
Windows8-RT-KB3109103-x86.msu

For all supported x64-based editions of Windows 8:
Windows8-RT-KB3109103-x64.msu

For all supported 32-bit editions of Windows 8.1:
Windows8.1-KB3109103-x86.msu

For all supported x64-based editions of Windows 8.1:
Windows8.1-KB3109103-x64.msu

Installation switches

See Microsoft Knowledge Base Article 934307

Restart requirement

A system restart is required after you apply this security update.

Removal information

To uninstall an update that is installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, click Windows Update, and then under See also, click Installed updates, and select from the list of updates.

File information

See Microsoft Knowledge Base Article 3109103

Registry key verification

Note A registry key does not exist to validate the presence of this update.

Windows Server 2012 and Windows Server 2012 R2 (all editions)Reference table

The following table contains the security update information for this software.

Security update file name

For all supported editions of Windows Server 2012:
Windows8-RT-KB3109103-x64.msu

For all supported editions of Windows Server 2012 R2:
Windows8.1-KB3109103-x64.msu

Installation switches

See Microsoft Knowledge Base Article 934307

Restart requirement

A system restart is required after you apply this security update.

Removal information

To uninstall an update that is installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, click Windows Update, and then under See also, click Installed updates, and select from the list of updates.

File information

See Microsoft Knowledge Base Article 3109103

Registry key verification

Note A registry key does not exist to validate the presence of this update.

Windows RT and Windows RT 8.1 (all editions)
Reference table

The following table contains the security update information for this software.

Deployment

These updates are available through Windows Update only.

Restart Requirement

A system restart is required after you apply this security update.

Removal Information

Click Control Panel, click System and Security, click Windows Update, and then under See also, click Installed updates, and select from the list of updates.

File Information

See Microsoft Knowledge Base Article 3109103

Windows 10 (all editions)
Reference table

The following table contains the security update information for this software.

Security update file name

For all supported 32-bit editions of Windows 10:
Windows10.0-KB3116869-x86.msu

For all supported x64-based editions of Windows 10:
Windows10.0-KB3116869-x64.msu

For all supported 32-bit editions of Windows 10 Version 1511:
Windows10.0-KB3116900-x86.msu

For all supported x64-based editions of Windows 10 Version 1511:
Windows10.0-KB3116900-x64.msu

Installation switches

See Microsoft Knowledge Base Article 934307

Restart requirement

A system restart is required after you apply this security update.

Removal information

To uninstall an update installed by WUSA, use the /Uninstall setup switch. Or, click Control Panel, click System and Security, click Windows Update, and then under See also, click Installed updates, and select from the list of updates.

File information

See Microsoft Knowledge Base Article 3116869
See Microsoft Knowledge Base Article 3116900

Registry key verification

Note A registry key does not exist to validate the presence of this update.


Help for installing updates: Support for Microsoft Update

Security solutions for IT professionals: TechNet Security Troubleshooting and Support

Help for protecting your Windows-based computer from viruses and malware: Virus Solution and Security Center

Local support according to your country: International Support

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