KB5079483

Microsoft has released cumulative update KB5079483 for Windows 11 version 25H2 for insiders on the Dev Channel – Windows 11 Insider Preview Quality Update (26300.8085).

The Dev Channel is transitioning to builds from the 26300 series, which means: after installing Windows 11 Insider Preview Build 26300.7674 and above, the window for switching from the Dev Channel to the Beta Channel will be closed. However, if a Windows Insider participant is currently on the Dev Channel and still wants to switch to the Beta Channel at the last moment, when the Build 26300.xxxx update appears in Windows Update, you can temporarily pause updates, change the channel to Beta, and then resume receiving updates.

Builds from the 26300 series will include many of the same features and improvements as builds from the 26220 series, which will continue to be released on the Beta Channel. However, over time, these builds will receive internal platform changes that may cause the list of known issues to differ between Dev and Beta.

• Pointer indicator. An accessibility feature for users with low vision, helping to locate the cursor on the screen more easily. Microsoft is resuming its rollout. You can enable it in Settings > Accessibility > Mouse pointer and touch, by activating the Pointer indicator option, or by searching in Settings. After enabling, you can quickly toggle the feature on and off using the keyboard shortcut Win + Ctrl + Shift + X. Microsoft is collecting feedback on cursor and crosshair behavior.
• Windows Magnifier. The feature can now magnify protected content.
• Network and Sharing. Fixed an issue where the Network and Sharing Center could incorrectly display two active Wi-Fi connections after switching between networks. Now, when connecting to a new network, only one active Wi-Fi connection is displayed.
• Input. Improved reliability of the explorer.exe process when closing the input flyout, and improved reliability of the fluid dictation setting in voice input settings (Windows + H).
• Feedback Hub. Microsoft has introduced an updated version of the app with a modern interface and improved user experience: simplified feedback submission through a unified template with category search; simplified navigation (My Feedback section is now in the navigation pane, and Community Feedback replaces All Feedback; the Announcements section has been removed); a new feedback type — kudos for highlighting features that work well; the ability to choose between public or private feedback; a new compact mode for quick feedback submission with the option to switch to the full version; improved screenshot tools (highlight, hide, crop). Microsoft encourages testing the updated Feedback Hub and sharing your opinion via Feedback Hub (Win + F) under Apps > Feedback Hub.

Known issues in this build are not listed in the provided text. Microsoft invites you to send feedback about the pointer indicator and the updated Feedback Hub through Feedback Hub (Win + F) in the appropriate sections.

To install via Windows Update, go to Settings > Windows Update and click Check for updates. A computer restart is required to complete the installation.

Pointer indicator: The function works by intercepting system calls for cursor rendering (DrawPointer in the win32k.sys kernel). When activated, the display driver overlays an additional visual layer with highlighting and animation on top of the frame buffer, without modifying the cursor itself. The hotkey Win + Ctrl + Shift + X triggers a service in UIAccess, instantly toggling the layer state without restarting processes.

Windows Magnifier: The mechanism uses the Magnification API to capture the screen buffer via D3D11Texture2D. Previously, protected content (e.g., PlayReady) blocked pixel reading. In this update, Microsoft implemented rendering through a virtual IDXGIOutputDuplication surface, allowing Magnifier to obtain frames from the DirectX swap chain, bypassing direct access to protected areas.

Network and Sharing: The error occurred due to a race condition in the wlansvc service when processing WLAN_NOTIFICATION_SOURCE_ACM events. When switching networks, the adapter registered two logical interfaces simultaneously. The fix adds a mutex lock in netsh_wlan.dll when calling WlanEnumInterfaces — the old interface is now deactivated before the new one appears.

Input: The issue involved a handle leak (HANDLE) in TextInputHost.exe when closing the flyout panel (TSF_E_FLYOUT_CLOSE). The fix introduces a reference count check in ctfmon.exe before calling DestroyWindow. For dictation, the Windows.Globalization.Speech stream is improved — the audio capture buffer now resets correctly on timeout.

Feedback Hub: The new architecture is built on WinUI 3 and WebView2 for rendering feedback forms. Kudos is a separate telemetry type with tag FeedbackType=Positive. Compact mode uses LightDismiss and a single-page model. Privacy selection calls different endpoints: public goes to api.onedrive.com, private to feedback.microsoft.com with TLS 1.3 encryption.

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