September's Windows 11 patch needs an emergency patch of its own
- ID
- 24673
- Status
- summarized
- Published
- 15 Sep 2026, 9:33 PM
- Fetched
- 15 Sep 2026, 10:30 PM
- Provider
- The Register
- Category
- technology
- Original URL
- https://www.theregister.com/on-prem/2026/09/15/septembers-windows-11-patch-needs-an-emergency-patch-of-its-own/5296567
- Source URL
- https://www.theregister.com/headlines.atom
Summary
- Score
- 3.5
- Created
- 15 Sep 2026, 10:31 PM
- Tags
- Audience
- developers
What happened
Microsoft released an out-of-band update for Windows 11 24H2 and 25H2 after September's Patch Tuesday fixed nearly 1,000 vulnerabilities but broke RDP, Hyper-V folder sharing with Linux VMs via Plan9, and USB Audio Class 1.0 devices. The emergency patch fixes RDP and Hyper-V issues, but USB audio problems persist—some devices remain silent or show Code 10 errors. A separate September update also broke Excel's Paste function, which remains unfixed.
Why it matters
If your team runs Windows 11 24H2/25H2 VMs or uses RDP for remote development, apply the out-of-band update to restore those services. If you rely on USB Audio Class 1.0 devices or Excel's Paste function, there is no fix yet—plan workarounds rather than waiting for the next patch cycle.
Discussion angle
Whether your team's patch management policy accounts for Microsoft's recent pattern of Patch Tuesday introducing regressions that require out-of-band fixes, and how to triage which patches to deploy immediately vs. delay.