On September 14, 2026, Microsoft introduced KB5129195, an out-of-band cumulative update aimed at enhancing the performance of Windows 11 versions 24H2 and 25H2. This update specifically addresses several regressions documented in the September update and includes critical security measures against CVE-2026-62721. However, it notably lacks a fix for the ongoing issues reported by users with AMD Radeon graphics cards, leaving problems such as freezes, black screens, driver timeouts, and display signal losses unaddressed.
What KB5129195 actually fixes
KB5129195 is applicable to all editions of Windows 11 24H2 and 25H2. Upon installation, systems will transition to build 26100.9457 for 24H2 or 26200.9457 for 25H2. The update resolves issues related to:
| Windows component | Problem addressed | Scope of the fix |
| Remote Desktop Services | Failed connections and sign-ins, configuration hangs, and unstable administration tools | Documented RDS regression |
| Plan9 file sharing | Host-folder sharing failures in some HCS-managed Linux virtual machines | Specific Hyper-V-related virtual-machine scenario |
| USB Audio Class 1.0 | Failures affecting 8-channel and 3D-audio modes | Other USB Audio Class 1.0 symptoms remain unresolved |
It is important to note that while the audio fix is significant, KB5129195 does not serve as a comprehensive solution for all USB audio issues, as its scope is limited to specific multichannel modes.
Why the Radeon reports are a separate issue
As for the AMD Radeon graphics issues, no confirmed fix is included in KB5129195. The update’s release notes do not mention any repairs for Radeon graphics drivers, leaving users grappling with persistent problems such as freezes, black screens, and driver timeouts after applying previous updates like KB5124008 and KB5126052. Reports indicate that these issues have affected various hardware configurations, including the Radeon RX 7900 XTX and RX 7800 XT paired with Ryzen processors.
Interestingly, attempts to resolve these issues by removing the problematic updates or rolling back to earlier driver versions have not yielded consistent results. Users have observed that even with the removal of updates, stability remains elusive, suggesting that the underlying cause may not be straightforward. While the timing of these issues has led to speculation about a link to the recent updates, this connection has yet to be substantiated.
Which Windows versions receive the update?
KB5129195 is available for Windows 11 24H2 and 25H2, across all editions. The resulting builds are as follows:
- Windows 11 24H2: 26100.9457
- Windows 11 25H2: 26200.9457
For distribution, Microsoft offers several channels: Windows Update, Windows Update for Business, WSUS, and the Microsoft Update Catalog. For administrators, the key takeaway is that while KB5129195 addresses specific regressions in Remote Desktop, Plan9 file sharing, and selected USB audio issues, the ongoing instability associated with AMD Radeon graphics remains a separate and unresolved challenge.
