Microsoft has released update KB5006674. This is the first cumulative update of Windows 11 and brings small bug fixes.
Since the launch of Windows 10 in 2015, Microsoft has focused on "Windows as a Service". The same model works for Windows 11. Update KB5006674 includes compatibility fixes (not security fixes), and if you leave Windows Update, this update will be done automatically.
Generally, Windows Updates released yesterday Tuesday include security fixes, but the first Windows 11 update is compatibility fixes. Installing the October 2021 cumulative update will raise the Build number of Windows 11 installed to Build 22000.194 (version 21H2).
So if you have Windows 11 installed and checking for updates today, the following update will appear in Windows Update:
2021-10 Cumulative Update for Windows 11 for x64-based Systems (KB5006674)
If you want the offline installer you can download it from the following link
Download Links for Windows 11 KB5006674
Windows 10 KB5006674 Direct Download Links: 64-bit and 32-bit (x86).
Microsoft said it has fixed compatibility issues between Intel's Killer and SmartByte and the operating system. The error affected the networking software and User Datagram Protocol (UDP) packages, which resulted in poor performance.
The error affected the performance of the sites, and some browsers loaded sites much slower than Windows 10. This cumulative update addresses the issue.
For PCs that do not comply with Microsoft requirements, they receive the update as shown in the image above. Note, however, that this is not a security update.