KB5124008: 2026-09 B update of 2026-09-08
Microsoft released KB5124008 (2026-09 B) on 8 September 2026 for Windows 11, version 24H2, Windows 11, version 25H2.
1 version
Facts
- Microsoft id
KB5124008- Products
- Windows 11
- Update type
- 2026-09 B
- Released
- 8 September 2026
- Out-of-band
- No
- Versions
- Windows 11, version 24H2, Windows 11, version 25H2
- Builds
- 26100.9445 (Windows 11, version 24H2), 26200.9445 (Windows 11, version 25H2)
- First captured by us
- (from our first import of this list)
- Microsoft last modified
- –
- Source
- Windows updates · open the original at Microsoft
Known issues
Started with this update
- Remote Desktop Services might stop responding after Sept. 2026 security update · Resolved
- Host folder shares might be unavailable in Hyper-V-based Linux VMs · Resolved
- USB audio devices might fail to start or produce no sound · Resolved
- Domain-joined devices might lose their secure trust relationship with the domain · Resolved
Resolved by this update
Microsoft says
Microsoft published no description with this item.
What Microsoft changed
One version so far. If Microsoft edits it, each change shows here with what was removed and added.
First version we captured ·
The text as we first saw it
Seen by us · Microsoft's page
Related changes
Mentioning the same Microsoft ids
- The October 2026 Windows security update is now available
- Mouse customization is reset on non-English Windows devices · Resolved KB5124008
- Desktop background settings are lost or reset on some devices · Resolved KB5124008
- Microsoft Teams and Outlook might fail to launch on ARM-based devices · Resolved
- Remote Desktop Services might stop responding after Sept. 2026 security update · Resolved
- Host folder shares might be unavailable in Hyper-V-based Linux VMs · Resolved
- USB audio devices might fail to start or produce no sound · Resolved
- Domain-joined devices might lose their secure trust relationship with the domain · Resolved
Last updated