Find notable cyber news and cases, enriched with sources, timelines, and signals.
Home Browse News Feed Stats Watchlists Beta About Contact

Microsoft Windows 11 KB5074109 and KB5073455 cumulative updates

Security Patch Release
First reported
Last updated
Happening score
H score 29
1 unique sources, 4 articles

Summary

Hide ▲

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 Windows Update restricted-network download failure

Service Disruption
First: 19.05.2026 14:22 Last: 19.05.2026 14:22 Sources 1

About this happening: Microsoft's **Windows Update** is failing in **restricted network environments** after the **January 2026 optional non-security preview updates**, leaving affected systems unable...

Open Happening

Microsoft Windows 11 KB5089549 cumulative update

Security Patch Release
First: 18.05.2026 11:33 Last: 18.05.2026 11:33 Sources 1

About this happening: Microsoft's **KB5089549** **Windows 11** security update is failing to install on some systems, forcing affected devices to roll back during reboot. The problem is tied to a nearl...

Open Happening

Microsoft adds Cloud-Initiated Driver Recovery for Windows Update driver rollbacks

Security Tool/Service
First: 15.05.2026 15:29 Last: 15.05.2026 15:29 Sources 1

About this happening: Microsoft is adding **Cloud-Initiated Driver Recovery** to **Windows Update**, giving it a remote rollback control for **problematic Windows drivers**. The capability reduces how...

Open Happening

Microsoft Windows Autopatch fix for EU restricted driver update deployment bug

Security Tool/Service
First: 13.05.2026 17:36 Last: 13.05.2026 17:36 Sources 1

About this happening: **Microsoft** fixed a **Windows Autopatch** service bug that let **restricted driver updates** reach some managed devices in the **EU**, bypassing admin approval controls and crea...

Open Happening

Microsoft Windows 365 Office installation disruption

Service Disruption
First: 13.05.2026 14:53 Last: 13.05.2026 14:53 Sources 1

About this happening: The **Windows 365** service update has introduced a **configuration change** that is blocking **Office downloads and installs** for some customers, disrupting access on cloud PCs....

Open Happening

Timeline

  1. 02.02.2026 19:17 1 articles · 3mo 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.

    Show sources
    Open in new tab
  2. 25.01.2026 15:20 1 articles · 4mo 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.

    Show sources
    Open in new tab
  3. 13.01.2026 20:53 3 articles · 4mo 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.

    Show sources
    Open in new tab