KB5122880: Overview with user sentiment and feedback
Last Updated October 30, 2026
Probability of successful installation and continued operation of the machine
Overview
KB5122880 is the September 8, 2026 cumulative security update for Windows 11, version 23H2 (OS Build 22631.7582), delivered alongside the September 2026 Patch Tuesday fixes. It also bundles servicing stack update KB5122879 (22621.7578). It applies to Windows 11 23H2 Enterprise, Education, and Home/Pro editions, with 23H2 Enterprise/Education reaching end of servicing on November 10, 2026.
General Purpose
- September 2026 security fixes, plus non-security items from the prior preview release
General Sentiment
Coverage from BleepingComputer describes the update as a routine Patch Tuesday release with no special issues noted at launch. Microsoft's own documentation, however, lists several significant problems introduced after installation, including audio and Remote Desktop failures, so the community signal is mixed.
Known Issues
- USB Audio Class 1.0 devices may fail with Code 10 or produce no audio; partially resolved by the September 14 OOB update, with other symptoms still open
- Hyper-V Linux VMs using Plan9 may lose host folder shares (affects WSL and similar apps)
- Remote Desktop Services may stop responding or fail RDP connections; resolved in updates from September 14, 2026 onward
- File History may fail to create or update backups; resolved in updates from October 13, 2026 onward
Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-10-30 08:08 PM
