Microsoft confirmed that its September security updates (KB5124008 and KB5124012) for Windows 11 are causing domain authentication failures on enterprise systems that use the Machine Identity Isolation feature. Affected devices show domain trust and credential errors even when login details are correct, because the updates cause Windows to enforce existing Machine Identity Isolation settings that are only meant for environments running Windows Server 2025 domain controllers. The company has released a temporary workaround while it develops a permanent fix.
bleepingcomputer.com
· 2026-09-17
Microsoft confirmed it is investigating reports that the Windows 11 KB5124008 security update is severing secure channel connections between domain-joined PCs and Active Directory after a reboot, locking out users with valid credentials. Administrators on Reddit and Microsoft's Q&A forums say the problem appears tied to the Windows Machine Identity Isolation feature when running in audit or enforcement mode, and that uninstalling the patch and repairing the domain trust restores access.
bleepingcomputer.com
· 2026-09-16
Microsoft confirmed that its September 8 security update, KB5124008, is causing audio failures on legacy USB Audio Class 1.0 hardware such as older speakers, headsets, and microphones. Affected users may see no sound, unresponsive volume controls, or a 'Code 10' error in Device Manager. The company noted a temporary workaround: switching the audio mode to Stereo restores sound until an official fix arrives.
zdnet.com
· 2026-09-14
Microsoft has acknowledged that the KB5124008 and KB5124012 security updates released on September 8, 2026 can cause USB Audio Class 1.0 devices to stop working on Windows 11 24H2 and later systems. Affected users report Code 10 errors in Device Manager, silent audio output, and frozen volume controls, with some speakers only failing when multichannel modes like 3D or 8-channel audio are used. No official fix exists yet, though switching to 2-channel mode has helped some users regain sound.
bleepingcomputer.com
· 2026-09-14
Microsoft has fixed a bug introduced by the optional KB5120998 preview update that caused mouse cursor personalization settings to revert to defaults on some Windows 11 24H2 and 25H2 devices, particularly non-English installations. The company says the September 8 KB5124008 cumulative update resolves the issue and is urging affected users to install it, noting that uninstalling the buggy update did not restore settings.
bleepingcomputer.com
· 2026-09-10
Microsoft has shipped the September 2026 Patch Tuesday cumulative updates KB5124008 and KB5122880 for Windows 11 versions 25H2/24H2 and 23H2. The update patches roughly 1,000 vulnerabilities catalogued in recent months and is mandatory, installable via Windows Update or the Microsoft Update Catalog. Since 25H2 shares its codebase with 24H2, both versions receive identical fixes and features.
bleepingcomputer.com
· 2026-09-08
GoKawiil