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Microsoft Windows 11 KB5074109 and KB5073455 cumulative updates

Security Patch Release
First reported
Last updated
Happening score
H score 26
1 unique sources, 4 articles

Summary

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Microsoft released mandatory Windows 11 KB5074109 and KB5073455 cumulative updates, delivering the January 2026 Patch Tuesday security fixes for 25H2/24H2 and 23H2 systems. The updates close security vulnerabilities across supported Windows 11 releases and are meant to be installed broadly. They matter because the release is mandatory and applies to the current Windows 11 servicing line.

Related Happenings

Microsoft extends Windows Server 2022 Hotpatch support through October 2027 for enrolled Azure Edition servers

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H score11 First: 29.06.2026 20:11 Last: 29.06.2026 20:11 Sources 1

About this happening: Microsoft has extended **Windows Server 2022 Hotpatch** support through **October 2027**, preserving **monthly security updates without restarts** for enrolled servers and reducin...

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Microsoft extends Windows 10 ESU consumer coverage through October 2027

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Microsoft YellowKey patch release (CVE-2026-45585)

Security Patch Release
H score20 First: 11.06.2026 20:43 Last: 11.06.2026 20:43 Sources 1

About this happening: Microsoft's **Patch Tuesday** updates this week patched **YellowKey (CVE-2026-45585)**, closing a **Windows BitLocker** bypass that could expose protected volumes. The vendor rele...

Open Happening

Microsoft Windows Update installation failures on upgraded Windows 11 PCs

Service Disruption
H score1 First: 10.06.2026 14:33 Last: 10.06.2026 14:33 Sources 1

About this happening: **Microsoft Windows Update** is failing on a **small percentage of upgraded Windows 11 PCs**, blocking **June 2026 cumulative updates** and producing **0x80073712** or **0x800f099...

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Microsoft June 2026 Patch Tuesday GreenPlasma and YellowKey fixes

Security Patch Release
H score15 First: 10.06.2026 02:11 Last: 10.06.2026 02:11 Sources 1

About this happening: **Microsoft** released **June 2026 Patch Tuesday** updates that fixed the **GreenPlasma** and **YellowKey** flaws, closing two previously disclosed issues in the Windows ecosystem...

Open Happening

Timeline

  1. 02.02.2026 19:17 1 articles · 5mo ago

    Microsoft confirms Windows 10 VSM shutdown bug after January 2026 updates

    Victim Impact Update

    Microsoft confirmed that Windows 10 22H2, Windows 10 Enterprise LTSC 2021, and Windows 10 Enterprise LTSC 2019 devices with Virtual Secure Mode (VSM) enabled can restart instead of shutting down or entering hibernation after installing KB5078131 and KB5073724, extending the same shutdown issue previously seen on Windows 11 23H2 with KB5073455 and System Guard Secure Launch enabled. A temporary workaround is to run `shutdown /s /t 0`, and Microsoft says a future Windows update will provide a fix.

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  2. 25.01.2026 15:20 1 articles · 5mo ago

    Microsoft investigates Windows 11 boot failures after KB5074109

    Initial Disclosure

    Microsoft is investigating reports that Windows 11 version 25H2 and all editions of version 24H2 can fail to boot with stop code UNMOUNTABLE_BOOT_VOLUME after installing the January 2026 Patch Tuesday update KB5074109. Affected physical devices may show a black Windows crash screen and require manual recovery to boot again, while no virtual machines have been reported so far.

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  3. 13.01.2026 20:53 3 articles · 5mo ago

    Microsoft releases Windows 11 KB5074109 and KB5073455

    Mitigation Patch Update

    Microsoft released mandatory Windows 11 KB5074109 and KB5073455 cumulative updates for 25H2/24H2 and 23H2, delivering the January 2026 Patch Tuesday security fixes, bug remediation, and feature changes. The update changes Windows 11 build numbers, removes legacy modem drivers including agrsm64.sys and smserial.sys, fixes WSL mirrored networking failures and Azure Virtual Desktop RemoteApp connection failures, addresses an NPU idle-power issue, updates WinSqlite3.dll, and changes Windows Deployment Services hands-free deployment behavior by default.

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