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KB5122880: Overview with user sentiment and feedback

Last Updated October 15, 2026

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Known Issues

Overview

KB5122880 is the September 8, 2026 cumulative update (OS Build 22621.7582) for Windows 11, version 23H2 (all editions), released alongside a servicing stack update (KB5122879). It is a Patch Tuesday security release that also carries non-security fixes from the August preview. Enterprise and Education editions of 23H2 reach end of servicing on November 10, 2026.

General Purpose

  • Includes the September 2026 Patch Tuesday security fixes (see MSRC for CVE details)
  • Adds updated Secure Boot certificate targeting data for eligible devices
  • Updates Morocco Standard Time for its permanent UTC+00:00 switch on September 20, 2026
  • Fixes a Remote Desktop audio redirection issue where remote session audio may not play locally
  • Updates Cellular COSA profiles (Telavox, Swisscom) and Omadmclient logging

General Sentiment

Community reception is mostly negative, but much of it centers on the 24H2/25H2 companion updates (KB5124008, KB5124008-related threads) rather than KB5122880 itself. BleepingComputer describes the September release as routine, and Reddit posts mainly concern the feature-heavy 24H2/25H2 builds. Some users report audio, Explorer, and domain trust problems on related builds, so caution is warranted before broad rollout.

Known Issues

  • USB Audio Class 1.0 devices may show Code 10 or produce no audio; partially resolved by the September 14, 2026 OOB update, with a workaround for remaining cases via Microsoft Support for Business
  • Hyper-V Linux VMs using Plan9 host folder shares may be unavailable (affects WSL and some sandboxed apps)
  • Remote Desktop Services may stop responding after the September 2026 security update; resolved in updates released on or after September 14, 2026
  • File History may fail to create or update backups after the September 2026 update; resolved in updates released on or after October 13, 2026

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 2026-10-15 02:01 PM

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