Summary
This security update resolves a vulnerability in Windows that could allow security feature bypass if an attacker runs a specially crafted application that could cause Windows Hyper-V to apply access control list (ACL) configuration settings incorrectly. Customers who have not enabled the Hyper-V role are not affected. To learn more about the vulnerability, see Microsoft Security Bulletin MS15-105.
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Important
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All future security and nonsecurity updates for Windows 8.1 and Windows Server 2012 R2 require update 2919355 to be installed. We recommend that you install update 2919355 on your Windows 8.1-based or Windows Server 2012 R2-based computer so that you receive future updates.
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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.
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3087088 MS15-105: Description of the security update for Hyper-V: September 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.
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 MS15-105 that corresponds to the version of Windows that you are running.
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Windows 8.1 (Pro and Enterprise editions)Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported x64-based editions of Windows 8.1:Windows8.1-KB3087088-x64.msu |
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Installation switches |
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Restart requirement |
A system restart is required after you apply this security update. |
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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. |
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File information |
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Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
Windows Server 2012 R2 (all editions)Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported editions of Windows Server 2012 R2:Windows8.1-KB3087088-x64.msu |
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Installation switches |
|
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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. |
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File information |
|
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Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
Windows 10 (all editions)Reference TableThe following table contains the security update information for this software.
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Security update file name |
For all supported x64-based editions of Windows 10:Windows10.0-KB3081455-x64.msu |
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Installation switches |
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Restart requirement |
A system restart is required after you apply this security update. |
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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. |
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File information |
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Registry key verification |
Note A registry key does not exist to validate the presence of this update. |
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File name |
SHA1 hash |
SHA256 hash |
|---|---|---|
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Windows8.1-KB3087088-x64.msu |
68477794F86C2B770DF459674934FFC79F7D91F4 |
3FD0619F7A570454BCB3EB17C8B5428C1C821545DBB435B491F0E88D1BBD9820 |
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Windows8.1-KB3087088-x64.msu |
68477794F86C2B770DF459674934FFC79F7D91F4 |
3FD0619F7A570454BCB3EB17C8B5428C1C821545DBB435B491F0E88D1BBD9820 |
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Windows8.1-KB3087088-x64.msu |
68477794F86C2B770DF459674934FFC79F7D91F4 |
3FD0619F7A570454BCB3EB17C8B5428C1C821545DBB435B491F0E88D1BBD9820 |
Help for installing updates: Support for Microsoft UpdateSecurity solutions for IT professionals: TechNet Security Troubleshooting and SupportHelp for protecting your Windows-based computer from viruses and malware: Virus Solution and Security CenterLocal support according to your country: International Support
