Description of the security update for the vulnerability in Windows Server 2008, Windows Embedded POSReady 2009, and Windows Embedded Standard 2009: May 08, 2018


An elevation of privilege vulnerability and an information disclosure vulnerability exist in Windows when the Win32k component fails to properly handle objects in memory.

To learn more about the vulnerabilities, see the following Common Vulnerabilities and Exposures (CVE).

More Information

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.

Additional non-security issues that are resolved by this update

In addition to the elevation of privilege vulnerability and information disclosure vulnerabilities that are addressed by this security update, the following non-security issue is also resolved:

  • After you install security update KB 4089344, Monthly Rollup KB 4088875, Security-only update KB 4088878, Monthly Rollup KB 4088877, or Security-only update KB 4088880, you receive a Stop error 0xAB error message that resembles the following when you log off the computer:

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 Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

Deployment information

For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:

File information

File information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight-saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

Windows Server 2008 file information

Windows Embedded POSReady 2009 and Windows Embedded Standard 2009 file information