Symptoms

You have a computer that is running Windows Vista, Windows 7, Windows Server 2008, or Windows Server 2008 R2. You install an application that uses a Windows Filtering Platform (WFP) callout driver. After the application is running for some time, a memory leak may occur in the nonpaged pool memory. In this situation, you may experience low performance on the computer. Note WFP callout drivers are usually used in third-party antivirus and firewall programs.

Cause

When the WFP callout driver blocks a packet that has multiple Net Buffer List (NBL) chains, the last NBL in the chain is not released by the WFP callout driver correctly. This causes a nonpaged pool memory leak.

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:

http://support.microsoft.com/contactus/?ws=supportNote 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, Windows 7, Windows Server 2008, or Windows Server 2008 R2.

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.

For all supported x86-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Netio.sys

6.0.6001.22659

220,040

22-Mar-2010

16:37

x86

Netio.sys

6.0.6002.22369

221,568

22-Mar-2010

17:40

x86

Bfe.dll

6.0.6001.22659

328,704

22-Mar-2010

16:05

x86

Fwpkclnt.sys

6.0.6001.22659

98,184

22-Mar-2010

16:37

x86

Fwpuclnt.dll

6.0.6001.22659

595,456

22-Mar-2010

16:06

x86

Ikeext.dll

6.0.6001.22659

438,272

22-Mar-2010

16:06

x86

Wfp.mof

Not Applicable

814

04-Mar-2010

05:54

Not Applicable

Wfp.tmf

Not Applicable

208,966

22-Mar-2010

14:37

Not Applicable

Tcpip.sys

6.0.6001.22659

902,024

22-Mar-2010

16:37

x86

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Netio.sys

6.0.6001.22659

342,920

22-Mar-2010

17:06

x64

Netio.sys

6.0.6002.22369

345,984

22-Mar-2010

17:43

x64

Bfe.dll

6.0.6001.22659

458,240

22-Mar-2010

16:32

x64

Fwpkclnt.sys

6.0.6001.22659

165,256

22-Mar-2010

17:06

x64

Fwpuclnt.dll

6.0.6001.22659

779,776

22-Mar-2010

16:33

x64

Ikeext.dll

6.0.6001.22659

454,656

22-Mar-2010

16:33

x64

Wfp.mof

Not Applicable

814

26-Feb-2010

04:14

Not Applicable

Wfp.tmf

Not Applicable

207,475

22-Mar-2010

15:04

Not Applicable

Tcpip.sys

6.0.6001.22659

1,414,024

22-Mar-2010

17:06

x64

Fwpuclnt.dll

6.0.6001.22659

595,456

22-Mar-2010

16:06

x86

Wfp.mof

Not Applicable

814

04-Mar-2010

05:54

Not Applicable

For all supported IA-64-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Netio.sys

6.0.6001.22659

638,344

22-Mar-2010

16:32

IA-64

Netio.sys

6.0.6002.22369

642,432

22-Mar-2010

17:35

IA-64

Bfe.dll

6.0.6001.22659

781,312

22-Mar-2010

15:58

IA-64

Fwpkclnt.sys

6.0.6001.22659

261,000

22-Mar-2010

16:32

IA-64

Fwpuclnt.dll

6.0.6001.22659

1,122,304

22-Mar-2010

15:59

IA-64

Ikeext.dll

6.0.6001.22659

925,696

22-Mar-2010

16:00

IA-64

Wfp.mof

Not Applicable

814

25-Feb-2010

07:43

Not Applicable

Wfp.tmf

Not Applicable

208,053

22-Mar-2010

14:46

Not Applicable

Tcpip.sys

6.0.6001.22659

2,941,320

22-Mar-2010

16:33

IA-64

Fwpuclnt.dll

6.0.6001.22659

595,456

22-Mar-2010

16:06

x86

Wfp.mof

Not Applicable

814

04-Mar-2010

05:54

Not Applicable

Windows 7 and Windows Server 2008 R2 file information notes

Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • 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 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. 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 7

File name

File version

File size

Date

Time

Platform

Netio.sys

6.1.7600.20611

240,000

07-Jan-2010

09:19

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Netio.sys

6.1.7600.20611

374,664

07-Jan-2010

09:50

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Netio.sys

6.1.7600.20611

710,528

07-Jan-2010

10:37

IA-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 NBL, visit the following Microsoft Developer Network (MSDN) Web site:

http://msdn.microsoft.com/en-us/library/bb245891.aspxFor 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, Windows 7, Windows Server 2008 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows Server 2008 and Windows Vista

File name

Package_1_for_kb979223~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

2,230

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_2_for_kb979223~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

2,177

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_3_for_kb979223~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,729

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_4_for_kb979223~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

2,235

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_5_for_kb979223~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

2,235

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_6_for_kb979223~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

2,444

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_7_for_kb979223~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

2,282

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_8_for_kb979223~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

2,282

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_client_1~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,641

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_client_2~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,694

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_client~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,713

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_sc_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,422

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_sc_1~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,690

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_sc~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,701

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_server_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,425

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_server_1~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,694

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_server~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,713

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_winpesrv_0~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,422

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

Package_for_kb979223_winpesrv~31bf3856ad364e35~x86~~6.0.1.0.mum

File version

Not Applicable

File size

1,430

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

X86_1297d07e130a17954710cd8f043d5b72_31bf3856ad364e35_6.0.6002.22369_none_9d9173aa1c96c1a3.manifest

File version

Not Applicable

File size

708

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

X86_166bc07af07b1fdd98dea7f0cc4a3e21_31bf3856ad364e35_6.0.6001.22659_none_2a1247a761e42d5e.manifest

File version

Not Applicable

File size

1,056

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

X86_56eda3a51d2ffa021efdc9d703bc1adf_31bf3856ad364e35_6.0.6001.22659_none_4d1c94225cb838dd.manifest

File version

Not Applicable

File size

1,402

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

X86_e31ce20a86bd1d8ab75145b002799514_31bf3856ad364e35_6.0.6001.22659_none_b4ae2ec6253eef9f.manifest

File version

Not Applicable

File size

702

Date (UTC)

23-Mar-2010

Time (UTC)

07:08

Platform

Not Applicable

File name

X86_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.0.6001.22659_none_56f8061cce8b88b0.manifest

File version

Not Applicable

File size

3,908

Date (UTC)

22-Mar-2010

Time (UTC)

17:46

Platform

Not Applicable

File name

X86_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.0.6002.22369_none_58d3a818cbb9f9c5.manifest

File version

Not Applicable

File size

3,908

Date (UTC)

22-Mar-2010

Time (UTC)

19:03

Platform

Not Applicable

File name

X86_microsoft-windows-network-security_31bf3856ad364e35_6.0.6001.22659_none_cd81093043c8d95a.manifest

File version

Not Applicable

File size

127,634

Date (UTC)

22-Mar-2010

Time (UTC)

17:48

Platform

Not Applicable

File name

X86_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6001.22659_none_b37aab997fa44247.manifest

File version

Not Applicable

File size

6,254

Date (UTC)

22-Mar-2010

Time (UTC)

17:49

Platform

Not Applicable

Additional files for all supported x64-based versions of Windows Server 2008 and Windows Vista

File name

Amd64_0094f1ed5ff99a9edaec7095ad37e407_31bf3856ad364e35_6.0.6001.22659_none_4fd02db1ad7e3902.manifest

File version

Not Applicable

File size

706

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Amd64_110a588feb14f5dfc79b2bdc1bbc88fb_31bf3856ad364e35_6.0.6002.22369_none_7776fd5aa0f4e61c.manifest

File version

Not Applicable

File size

1,066

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Amd64_3c922e3b66bac31146211c34ee4f8046_31bf3856ad364e35_6.0.6001.22659_none_c18a2a20950692c6.manifest

File version

Not Applicable

File size

1,410

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Amd64_d053908ec21dac78481eae1d8b51845d_31bf3856ad364e35_6.0.6001.22659_none_f979fc035be7ae39.manifest

File version

Not Applicable

File size

1,766

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Amd64_f1adcdf3ffb1eb5c3204652b289efa9e_31bf3856ad364e35_6.0.6001.22659_none_391971a0ff5be877.manifest

File version

Not Applicable

File size

2,114

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Amd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.0.6001.22659_none_b316a1a086e8f9e6.manifest

File version

Not Applicable

File size

3,916

Date (UTC)

22-Mar-2010

Time (UTC)

18:13

Platform

Not Applicable

File name

Amd64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.0.6002.22369_none_b4f2439c84176afb.manifest

File version

Not Applicable

File size

3,916

Date (UTC)

22-Mar-2010

Time (UTC)

18:46

Platform

Not Applicable

File name

Amd64_microsoft-windows-network-security_31bf3856ad364e35_6.0.6001.22659_none_299fa4b3fc264a90.manifest

File version

Not Applicable

File size

127,680

Date (UTC)

22-Mar-2010

Time (UTC)

18:15

Platform

Not Applicable

File name

Amd64_microsoft-windows-tcpip-binaries_31bf3856ad364e35_6.0.6001.22659_none_0f99471d3801b37d.manifest

File version

Not Applicable

File size

6,276

Date (UTC)

22-Mar-2010

Time (UTC)

18:16

Platform

Not Applicable

File name

Package_1_for_kb979223~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,244

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_2_for_kb979223~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,643

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_3_for_kb979223~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,739

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_4_for_kb979223~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,701

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_5_for_kb979223~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,701

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_6_for_kb979223~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,690

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_7_for_kb979223~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,526

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_8_for_kb979223~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

2,526

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,651

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_client_2~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,706

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_client~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,723

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_sc_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,430

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_sc_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,702

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_sc~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,711

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,433

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_server_1~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,706

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_server~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,723

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_winpesrv_0~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,430

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Package_for_kb979223_winpesrv~31bf3856ad364e35~amd64~~6.0.1.0.mum

File version

Not Applicable

File size

1,438

Date (UTC)

23-Mar-2010

Time (UTC)

07:10

Platform

Not Applicable

File name

Wow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.0.6001.22659_none_bd6b4bf2bb49bbe1.manifest

File version

Not Applicable

File size

2,730

Date (UTC)

22-Mar-2010

Time (UTC)

17:41

Platform

Not Applicable

File name

Wow64_microsoft-windows-netio-infrastructure_31bf3856ad364e35_6.0.6002.22369_none_bf46edeeb8782cf6.manifest

File version

Not Applicable

File size

2,730

Date (UTC)

22-Mar-2010

Time (UTC)

18:57

Platform

Not Applicable

File name

Wow64_microsoft-windows-network-security_31bf3856ad364e35_6.0.6001.22659_none_33f44f0630870c8b.manifest

File version

Not Applicable

File size

71,155

Date (UTC)

22-Mar-2010

Time (UTC)

17:41

Platform

Not Applicable

Additional files for all supported IA64-based versions of Windows Server 2008

File name

Ia64_66a455c812ac9d6c2954f9943be71018_31bf3856ad364e35_6.0.6001.22659_none_fa81573cd1528ecc.manifest

File version

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Date (UTC)

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