MS15-105: Description of the security update for Hyper-V: September 8, 2015

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 R2 Essentials

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 do not have the Hyper-V role enabled are not affected.

To learn more about the vulnerability, see Microsoft Security Bulletin MS15-105.

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Important
  • 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. 
  • 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.

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.

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