October Preview Update (#49506)

* October Preview Update

* Update docs/framework/release-notes/release-notes.md

Co-authored-by: Copilot <[email protected]>

* Update docs/framework/release-notes/2025/10-28-october-cumulative-update-preview.md

Co-authored-by: Copilot <[email protected]>

* Update docs/framework/release-notes/2025/10-28-october-cumulative-update-preview.md

Co-authored-by: Copilot <[email protected]>

* Update docs/framework/release-notes/2025/10-28-october-cumulative-update-preview.md

Co-authored-by: Genevieve Warren <[email protected]>

* Update 10-28-october-cumulative-update-preview.md

* Revise October 2025 cumulative update to preview

Updated the release notes to reflect the preview status and new release date.

---------

Co-authored-by: Copilot <[email protected]>
Co-authored-by: Genevieve Warren <[email protected]>

Author: 3 people

docs/framework/release-notes/2025/10-28-october-cumulative-update-preview.md

@@ -0,0 +1,38 @@
+---
+title: October 2025 cumulative update preview
+description: Learn about the improvements in the .NET Framework October 2025 cumulative update preview.
+ms.date: 10/28/2025
+---
+# October 2025 cumulative update preview
+
+_Released October 28, 2025_
+
+## Summary of what's new in this release
+
+- [Security improvements](#security-improvements)
+- [Quality and reliability improvements](#quality-and-reliability-improvements)
+
+### Security improvements
+
+There are no new security improvements in this release. This update is cumulative and contains all previously released security improvements.
+
+### Quality and reliability improvements
+
+#### .NET Runtime
+
+Addresses an issue to update operating systeam calls for compliance with current standards. (*Applies to: .NET Framework 4.8.1*)
+
+## Known issues in this release
+
+This release contains no known issues.
+
+## Summary tables
+
+The following table outlines the updates in this release.
+
+| Product version | Cumulative update preview |
+| --- | --- |
+| **Windows 11, version 25H2** | |
+| .NET Framework 3.5, 4.8.1 | [5067931](https://support.microsoft.com/kb/5067931) |
+
+The operating system row lists a KB that's used for update offering purposes. When the operating system KB is offered, the applicability logic determines the specific .NET Framework update(s) installed. Updates for individual .NET Framework versions are installed based on the version of .NET Framework that is already present on the device. Because of this, the operating system KB is not expected to be listed as installed updates on the device. The expected updates installed are the .NET Framework-specific version updates listed in the previous table.

docs/framework/release-notes/release-notes.md

@@ -11,8 +11,9 @@ The .NET Framework updates include cumulative security and reliability improveme
 
 .NET Framework cumulative update releases are discussed in detail in the following individual release notes:
 
-* October 14, 2025 - [cumulative update preview](./2025/10-14-october-cumulative-update.md) **New Release**
-* September 9, 2025 - [cumulative update preview](./2025/09-09-september-cumulative-update.md)
+* October 28, 2025 - [cumulative update preview](./2025/10-28-october-cumulative-update-preview.md) **New Release**
+* October 14, 2025 - [cumulative update](./2025/10-14-october-cumulative-update.md)
+* September 9, 2025 - [cumulative update](./2025/09-09-september-cumulative-update.md)
 * August 26, 2025 - [cumulative update preview](./2025/08-26-august-cumulative-update-preview.md)
 * July 8, 2025 - [cumulative update](./2025/07-08-july-cumulative-update.md)
 * April 22, 2025 - [cumulative update preview](./2025/04-22-april-cumulative-update-preview.md)

docs/framework/toc.yml

@@ -705,6 +705,8 @@ items:
       href: release-notes/2025/09-09-september-cumulative-update.md
     - name: October 2025 cumulative update
       href: release-notes/2025/10-14-october-cumulative-update.md
+    - name: October 2025 cumulative update preview
+      href: release-notes/2025/10-28-october-cumulative-update-preview.md
   - name: What's new
     href: whats-new/index.md
   - name: What's new in accessibility