Patchday: Windows 11 Updates (January 11, 2022)

Windows[German]On January 11, 2022 (second Tuesday of the month, Patchday at Microsoft), Microsoft has also released a cumulative update for Windows 11, which was released on October 5, 2021. The update is supposed to fix various issues. Here are some details about this update.


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A list of updates can be found on this Microsoft website. I have pulled out the details below.

Update KB5009566 for Windows 11

Cumulative Update KB5009566 raises the OS build on Windows 11 to 22000.434 and includes quality improvements and security patches, but no new OS features. Among the major changes this update makes are:

Addresses a known issue that affects Japanese Input Method Editors (IME). When you use a Japanese IME to enter text, the text might appear out of order or the text cursor might move unexpectedly in apps that use the multibyte character set (MBCS). This issue affects the Microsoft Japanese IME and third-party Japanese IMEs.

Microsoft notes that this update makes quality improvements to the servicing stack (responsible for Microsoft updates). This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog  and via WSUS and WUfB. Microsoft states a known issue is that some image editing programs on Windows 11 do not correctly reproduce colors on certain HDR (High Dynamic Range) displays. This is often observed with white colors that may be displayed in bright yellow or other colors. I had addressed this in the blog post Windows 11: Microsoft confirms issues with false colors displayed. Microsoft is working on the problem. More details can be found in the KB article here.

Windows Server 2022

According to this Microsoft page, cumulative update  KB5009555 has been released for Windows Server 2022, , raising the OS build to 20348.469. The main changes that this update makes include:

  • Addresses an issue that prevents Active Directory (AD) attributes from being written properly during a Lightweight Directory Access Protocol (LDAP) modify operation when you make multiple attribute changes.

  • Addresses a known issue that affects Japanese Input Method Editors (IME). When you use a Japanese IME to enter text, the text might appear out of order or the text cursor might move unexpectedly in apps that use the multibyte character set (MBCS). This issue affects the Microsoft Japanese IME and third-party Japanese IMEs.

Microsoft notes that this update makes quality improvements to the servicing stack (is responsible for Microsoft updates). This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog and via WSUS and WUfB. However, the update causes massive collateral damage like boot loops on DCs, remote desktop and VPN connections disrupted. In the meantime the problems are confirmed in the support article KB5009555.


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Similar articles:
Microsoft Office Updates (January 4, 2022)
Microsoft Security Update Summary (January 11, 2022)
Patchday: Windows 8.1/Server 2012 R2 Updates (January 11, 2022), boot loop reported
Patchday: Windows 10 Updates (January 11, 2022)
Patchday: Windows 11 Updates (January 11, 2022)
Patchday: Updates for Windows 7/Server 2008 R2 (January 11, 2022)

Windows Server: January 2022 security updates are causing DC boot loop
Windows VPN connections (L2TP over IPSEC) broken after January 2022 update
Windows Server 2012/R2: January 2022 Update KB5009586 bricks Hyper-V Host


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