February 13, 2024—KB5034769 (OS Build 25398.709)

Improvements 

This security update includes quality improvements. When you install this KB: 

• New! This update affects software defined networking (SDN). You can now deploy SDN on Windows failover clustering. Service Fabric SDN deployment remains in support.

• This update addresses a handle leak in Windows Management Instrumentation (WMI) provider traces. Because of this, WMI commands fail at a random stage when you deploy a cluster.

• This update addresses an issue that affects remote direct memory access (RDMA) performance counters. They do not return networking data on VMs in the right way.

• This update addresses an issue that affects fontdrvhost.exe. It stops responding when you use Compact Font Format version 2 (CFF2) fonts.

• This update addresses an issue that affects clusters. It stops you from registering a cluster using Network ATC. This occurs after you set the proxy to use Network ATC. The issue also stops a preset proxy configuration from clearing.

• This update addresses a memory leak in TextInputHost.exe. The leak might cause text input to stop working on devices that have not restarted for many days.

• This update addresses an issue that affects touchscreens. They do not work properly when you use more than one monitor.

• This update includes quarterly changes to the Windows Kernel Vulnerable Driver Blocklist file, DriverSiPolicy.p7b. It adds to the list of drivers that are at risk for Bring Your Own Vulnerable Driver (BYOVD) attacks.

• This update affects Unified Extensible Firmware Interface (UEFI) Secure Boot systems. It adds a renewed signing certificate to the Secure Boot DB variable. You can now opt for this change. For more details, see KB5036210.

• This update addresses an issue that occurs after you run a Push-button reset. You cannot set up Windows Hello facial recognition. This affects devices that have Windows Enhanced Sign-in Security (ESS) turned on.

• This update addresses an issue that affects the download of device metadata. Downloads from the Windows Metadata and Internet Services (WMIS) over HTTPS are now more secure.

• This update addresses an issue that affects the Local Security Authority Subsystem Service (LSASS). It might stop working. This occurs when you access the Active Directory database.

• This update addresses an issue that affects the Certificate Authority snap-in. You cannot select the "Delta CRL" option. This stops you from using the GUI to publish Delta CRLs.

For more information about security vulnerabilities, please refer to the Security Update Guide and the February 2024 Security Updates. 

Known issues in this update

Microsoft is not currently aware of any issues with this update.

How to get this update

Before installing this update

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

Install this update

File Information 

For a list of the files that are provided in this update, download the file information for cumulative update 5034769.

For a list of the files that are provided in the servicing stack update, download the file information for the SSU - version 25398.700.