Today, we are releasing the March 2024 Cumulative Update Preview Updates for .NET Framework.
Quality and Reliability
This release contains the following quality and reliability improvements.
.NET Runtime
Addresses an issue when thread pool recycled lists become unresponsive on multi-CPU-group computers.
Addresses an issue where Interlocked.Read from 32-bit apps are much slower on some computers.
.NET Libraries
Addresses a performance issue in ASP.NET applications after installing the January 2024 .NET Framework update.
.NET Compilers
Addresses an issue when using the native C# compiler (csc.exe) to compile code making calls to COM interop assemblies.
Getting the Update
The Cumulative Update Preview is available via Windows Update and Microsoft Update Catalog.
Customers using Windows 11, version 22H2 and Windows 11, version 23H2, you will now find .NET Framework updates on the Settings > Windows Update > Advanced options > Optional updates page.
Advanced system administrators can also take use of the below direct Microsoft Update Catalog download links to .NET Framework-specific updates. Before applying these updates, please ensure that you carefully review the .NET Framework version applicability, to ensure that you only install updates on systems where they apply.
The following table is for Windows 10+ versions.
Product Version
Cumulative Update
Windows 11, version 23H2
.NET Framework 3.5, 4.8.1
Catalog
5036035
Windows 11, version 22H2
.NET Framework 3.5, 4.8.1
Catalog
5036581
Windows 10, version 22H2
.NET Framework 3.5, 4.8
Catalog
5036036
.NET Framework 3.5, 4.8.1
Catalog
5036034
The operating system row lists a KB which will be used for update offering purposes. When the operating system KB is offered, the applicability logic will determine the specific .NET Framework update(s) will be installed. Updates for individual .NET Framework versions will be 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 update to be installed are the .NET Framework specific version updates listed in the table above.
Previous Monthly Rollups
The last few .NET Framework Monthly updates are listed below for your convenience:
.NET Framework February 2024 Security and Quality Rollup Updates
.NET Framework January 2024 Cumulative Update Preview
.NET Framework January 2024 Security and Quality Rollup
.NET Framework October 2023 Cumulative Update Preview
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