Summary
This security update resolves vulnerabilities in Windows that could allow remote code execution in a host context if a specially crafted application is run by an authenticated and privileged user on a guest virtual machine that is hosted by Hyper-V. An attacker must have valid logon credentials for a guest virtual machine to exploit this vulnerability. To learn more about the vulnerability, see Microsoft Security Bulletin MS15-068.
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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 additional information about this security update as it relates to individual product versions. The articles may contain known issue information.
- 3046359 MS15-068: Description of the security update for Windows Hyper-V: July 14, 2015
- 3046339 MS15-068: Description of the security update for Windows Hyper-V: July 14, 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 8.1, this update is available through Windows Update only.
Method 2: Microsoft Download Center
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 MS15-068 that corresponds to the version of Windows that you are running.
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Security update deployment information
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 x64-based editions of Windows Server 2008: Windows6.0-KB3046359-x64.msu |
|---|---|
| Installation switches | See Microsoft Knowledge Base Article 934307 |
| Restart requirement | Yes, you must restart your system after you apply this security update. |
| Removal information | WUSA.exe does not support uninstall of updates. To uninstall an update installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates and select from the list of updates. |
| File information | See Microsoft Knowledge Base Article 3046359 |
| 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-KB3046359-x64.msu |
|---|---|
| Installation switches | See Microsoft Knowledge Base Article 934307 |
| Restart requirement | Yes, you must restart your system 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, and then under Windows Update, click View installed updates and select from the list of updates. |
| File information | See Microsoft Knowledge Base Article 3046359 |
| 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 x64-based editions of Windows 8.1: Windows8.1-KB3046339-x64.msu |
|---|---|
| For all supported x64-based editions of Windows 8.1: Windows8.1-KB3046359-x64.msu |
|
| Installation switches | See Microsoft Knowledge Base Article 934307 |
| Restart requirement | Yes, you must restart your system 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 3046359 |
| 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-KB3046339-x64.msu |
|---|---|
| For all supported editions of Windows Server 2012: Windows8-RT-KB3046359-x64.msu |
|
| For all supported editions of Windows Server 2012 R2: Windows8.1-KB3046339-x64.msu |
|
| For all supported editions of Windows Server 2012 R2: Windows8.1-KB3046359-x64.msu |
|
| Installation switches | See Microsoft Knowledge Base Article 934307 |
| Restart requirement | Yes, you must restart your system 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 3046359 |
| Registry key verification | Note A registry key does not exist to validate the presence of this update. |
File hash information
| File name | SHA1 hash | SHA256 hash |
|---|---|---|
| Windows6.0-KB3046339-x64.msu | BE0C3EBAA0E857DD74AD76F10045359221A2780B | 868D8D7D5DA0D8F93CFBCF3DB5F5A26C803085CBC4874FF1DA95D4265074CA7B |
| Windows6.1-KB3046339-x64.msu | 97A48BD2C7E72451B238AF1438D25AE288822012 | 3F1C5F0B83011FA58B9DDCB8EBA0E05A74CA5EA29A2640A0C9D7C9E6CF69249C |
| Windows8.1-KB3046339-x64.msu | B24B39E3D681358A888945686B0F6DBFCBB94E1E | B2491F3C6689B9CC65602A0DF8C235E173D6A6D88088CAC492D45B348BE05DDB |
| Windows8.1-KB3046359-x64.msu | 55171DFE080DBA3F91414135D247AB151F42CB28 | 4AF3AE4D0C826BD633FF906CDCE873114FD48C7DFE8E87593489E35193245FF4 |
| Windows8-RT-KB3046339-x64.msu | 1DB8F366F714295FE0823F8B610623EDDA815A8B | B48934AD90D61480DD6C14ACAD9E0C0329B23DD288AD72E9226E9A83EC6CCB78 |
How to obtain help and support for this security 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