June 11, 2024—KB5039227 (OS Build 20348.2527)

Improvements

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

• New! This update affects Server Message Block (SMB) over Quick UDP Internet Connections (QUIC). It turns on the SMB over QUIC client certificate authentication feature. Admins can use it to restrict which clients can access SMB over QUIC servers. To learn more, see Configure SMB over QUIC client access control in Windows Server.

• New! The LCU will no longer have the reverse differentials. The client will generate the playback delta. This change will help to reduce the LCU package size by about 20%. This change also offers a few advantages. It:

  • Reduces bandwidth usage

  • Provides faster downloads

  • Minimizes network traffic

  • Improves performance on slow connections.

• This update affects the version of curl.exe that isin Windows. The version number is now 8.7.1.

• This update addresses an issue that affects Outlook and OneNote. Their search function stops working. This occurs when you use Azure Virtual Desktop (AVD).

• This update addresses an issue that affects lsass.exe. It stops responding. This occurs after you install the April 2024 security updates on Windows servers.

• This update addresses an issue that affects Windows Hello for Business. You cannot use it to authenticate to Entra ID on certain apps. This occurs when you use Web Access Management (WAM).

• This update addresses an issue that affects a Microsoft Entra ID account. Devices cannot authenticate a second one. This occurs after you install the Windows update, dated November 13, 2023.

• This update addresses an issue that affects Microsoft Edge. The UI is wrong for the Internet Options Data Settings.

• This update addresses an issue that affects Storage Spaces Direct (S2D) and Remote Direct Memory Access (RDMA). When you use them with SMBdirect in your networks, the networks fail. You also lose the ability to manage clusters.

• This update addresses an issue that affects Containers. They do not move past the “ContainerCreating” status.

• This update addresses an issue that affects Windows Defender Application Control (WDAC). It prevents a stop error that occurs when you apply more than 32 policies.

• This update addresses an issue that might stop your system from resuming from hibernate. This occurs after you turn on BitLocker.

• This update addresses an issue that affects Windows Defender Application Control (WDAC). The issue copies unsigned WDAC policies to the Extensible Firmware Interface (EFI) disk partition. It is reserved for signed policies. 

• This update addresses an issue that affects Enhanced Fast Reconnect. It fails. This occurs when you use it with third-party remote desktop protocol (RDP) providers. 

• This update addresses an issue that affects the Remote Desktop Session Host (RD Session Host). A deadlock occurs when a large number of users sign in.

• This update addresses an issue that affects dsamain.exe. It stops responding. This occurs when the Knowledge Consistency Checker (KCC) runs evaluations.

• This update addresses an issue that affects lsass.exe. It leaks memory. This occurs during a Local Security Authority (Domain Policy) Remote Protocol (LSARPC) call.

• This update addresses an issue that affects the kernel stack. It might overflow. Because of this, VMs might shut down prematurely.

• Starting in this update, File Explorer adds the Mark of the Web (MoTW) tag to files and folders that come from untrusted locations. When MapUrlToZone classifies a file as “Internet,” that file also gets this tag. Because of this change, the “LastWriteTime” time stamp is updated. This might affect some scenarios that rely on file copy operations.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

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

Known issues in this update

How to get this update

Before you install 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.

Prerequisite for offline OS image servicing:

​​​​​​​Make sure that your image includes KB5030216 (09/12/2023) or a later LCU. If not, install it on your offline media before you install the latest update. This LCU updates the SSU version to 20348.1960. That is the minimum SSU version you must have to prevent error 0x800f0823 (CBS_E_NEW_SERVICING_STACK_REQUIRED).

Install this update

To install this update, use one of the following Windows and Microsoft release channels.

File Information

For a list of the files that are provided in this update, download the file information for cumulative update 5039227. 

For a list of the files that are provided in the servicing stack update, download the file information for the SSU (KB5039343) - version 20348.2522.