Windows administrators have been grappling with significant operational disruptions after **Microsoft's** September security updates introduced a cascade of critical bugs. The most pressing issue involved **Remote Desktop Services (RDS)** becoming unstable across affected systems, leading to frustrating RDP connection failures, sign-in issues, and, in severe cases, unresponsive servers. This instability impacted related components such as **Microsoft Management Console (MMC)**, **RDS Licensing Diagnoser**, **File Explorer**, and even the Windows Update page itself. ### Emergency Updates Deployed In response to the widespread outcry, **Microsoft** deployed multiple out-of-band updates on September 14 to rectify these critical flaws. The updates are available for a range of operating systems: * **Windows 10 21H2 and 22H2:** **KB5129236** * **Windows 11 24H2 and 25H2:** **KB5129195** * **Windows 11 26H1:** **KB5129194** * **Windows Server 2019:** **KB5129238** * **Windows Server 2022:** **KB5129237** * **Windows Server 2025:** **KB5129235** These server-specific updates directly address the **RDS** failures introduced by September's **KB5122871** update on **Windows Server 2025** and **KB5122882** on **Windows Server 2022**. Prior to these permanent fixes, **Microsoft** had offered **Group Policy** mitigations as a temporary workaround. Administrators also found that uninstalling the problematic September security updates restored **Remote Desktop** functionality, albeit at the cost of removing crucial security patches. ### Broader Fixes for Hyper-V and Audio The out-of-band updates for **Windows 11** also extend to resolving a **Hyper-V** issue. This bug impacted applications utilizing **Host Compute Service (HCS)**-managed virtual machines, specifically causing problems when sharing Windows host folders with **Linux** virtual machines via **Plan9**. This resulted in shared folders either not appearing or being inaccessible within the guest environment. Furthermore, the updates tackle an audio issue affecting some **USB Audio Class 1.0** devices when operating in multichannel audio modes, such as 8-channel and 3D audio. While these devices continued to function in standard stereo mode, they would fail upon switching to multichannel configurations. ### Remaining Audio Challenges It's important to note that these emergency updates do not resolve all the **USB audio** problems introduced by the September patches. **Microsoft** acknowledged a lingering issue in its release notes: "After installing the September 8, 2026, Windows security update, some **USB Audio Class 1.0** devices might fail to start or produce audio. Affected devices might experience one or more of the following symptoms: The device displays an error in Device Manager: "This device cannot start (Code 10)." No audio output. Volume controls are unresponsive or remain at zero. Sound settings are unresponsive or unavailable. This issue is limited to **USB Audio Class 1.0** devices." **Microsoft** has confirmed that it is actively working on a fix for these remaining audio-related issues.