Data corruption occurs when a user updates a shared file on a computer that is running Windows Vista or Windows Server 2008

Se aplica a: Windows Vista BusinessWindows Vista Business 64-bit EditionWindows Vista Enterprise

Symptoms


Consider the following scenario:
  • You share a file on a computer that is running Windows Vista or Windows Server 2008.
  • Multiple users that are using multiple remote computers open the file by using the Server Message Block (SMB) Version 2 protocol.
  • One of the users updates the file.
In this scenario, data corruption may occur in the file.

Note By default, the following operating systems use the SMB Version 2 protocol:
  • Windows 7
  • Windows Server 2008 R2
  • Windows Vista
  • Windows Server 2008

Cause


This issue occurs because the SMB redirector (Mrxsmb20.sys) incorrectly reports the position of the end of the file. Therefore, an application may unknowingly request to write to an incorrect location. This behavior causes data corruption.

Resolution


Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running Windows Vista Service Pack 2 (SP2) or Windows Server 2008 Service Pack 2 (SP2).

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the 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 the times may change when you perform certain operations on the files.
Windows Vista and Windows Server 2008 file information notes
Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    VersionProductSR_LevelService branch
    6.0.600
    2.
    22xxx
    Windows Vista and Windows Server 2008SP2LDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 and for Windows Vista" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Mrxsmb20.sys6.0.6002.2273980,89605-Nov-201122:37x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
File nameFile versionFile sizeDateTimePlatform
Mrxsmb20.sys6.0.6002.22739108,03207-Nov-201107:14x64
For all supported IA-64-based versions of Windows Server 2008
File nameFile versionFile sizeDateTimePlatform
Mrxsmb20.sys6.0.6002.22739267,26406-Nov-201115:56IA-64

Status


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information


For more information about a similar issue that occurs in Windows 7 or in Windows Server 2008 R2, click the following article number to view the article in the Microsoft Knowledge Base:

2618096 Data corruption when one user on a computer that is running Windows 7 or Windows Server 2008 R2 updates a shared file that is open on multiple computers by using SMB Version 2

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008
File nameX86_d94b98d5aa84e7cc262281f049fad172_31bf3856ad364e35_6.0.6002.22739_none_921aee700c48ce6c.manifest
File versionNot Applicable
File size701
Date (UTC)07-Nov-2011
Time (UTC)15:53
File nameX86_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.0.6002.22739_none_8d33a83aa019f425.manifest
File versionNot Applicable
File size6,960
Date (UTC)06-Nov-2011
Time (UTC)00:31
Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008
File nameAmd64_73a68176ea761d1d64df217de177207b_31bf3856ad364e35_6.0.6002.22739_none_60e7d671b0245a83.manifest
File versionNot Applicable
File size705
Date (UTC)07-Nov-2011
Time (UTC)15:53
File nameAmd64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.0.6002.22739_none_e95243be5877655b.manifest
File versionNot Applicable
File size6,972
Date (UTC)07-Nov-2011
Time (UTC)09:44
Additional files for all supported IA-64-based versions of Windows Server 2008
File nameIa64_20484db5c0ed2672009f3c3bb8ec1a4e_31bf3856ad364e35_6.0.6002.22739_none_3a2621003b530f89.manifest
File versionNot Applicable
File size703
Date (UTC)07-Nov-2011
Time (UTC)15:53
File nameIa64_microsoft-windows-smb20-minirdr_31bf3856ad364e35_6.0.6002.22739_none_8d354c30a017fd21.manifest
File versionNot Applicable
File size6,966
Date (UTC)06-Nov-2011
Time (UTC)18:06