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Windows 7: KB4091290 Update for Windows 7 - March 1, 2018

06 Mar 2018   #1

64-bit Windows 10 Pro
KB4091290 Update for Windows 7 - March 1, 2018

March 1, 2018 - KB4091290

Applies to: Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1


This update addresses a known issue previously called out in KB4075211 where the LSM.EXE process and applications that call SCardEstablishContext or SCardReleaseContext may experience a handle leak. Once the leaked handle count reaches a certain threshold, smart card based operations fail with error with SCARD_E_NO_SERVICE

Known issues

Because of an issue that affects some versions of antivirus software, this fix is being applied only to the computers on which the antivirus ISV have updated the ALLOW REGKEY.

Contact your antivirus manufacturer to verify that their software is compatible and that they have set the following REGKEY on the computer:


Value Name="cadca5fe-87d3-4b96-b7fb-a231484277cc"



After installing this update, SMB servers may experience a memory leak.

Microsoft is working on a resolution and will provide an update in an upcoming release.

Update replacement information

This update replaces the previously released update KB4075211.

How to get this update

This is provided as an update on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update. To get the standalone package for this update, go to the Microsoft Update Catalog website.

File information

For a list of the files that are provided in this update, download the file information for update 4091290.


Direct download links for KB4091290 MSU file from Microsoft Update Catalog:

Download KB4091290 MSU for Windows 7 32-bit (x86) - 137.6 MB

Download KB4091290 MSU for Windows 7 64-bit (x64) - 234.6 MB

My System SpecsSystem Spec

 KB4091290 Update for Windows 7 - March 1, 2018

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