Sep 2026

regressions

• [WORKAROUND]
  OtherKB5124008

  USB Audio Class 1.0 devices may fail to start or produce no sound, displaying Code 10 or failing in multichannel audio modes after installing KB5124008 on Windows Server 2022.

  18 reports · 2 admins · last seen 9/14/2026 · sources →

• [WORKAROUND]
  Hyper-VKB5124008

  Plan9 host folder shares might not appear in Hyper-V-based Linux VMs after installing the September 2026 security update (KB5124008) on Windows 11, version 24H2.

  16 reports · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  OtherKB5002914

  Excel 2016 copy and paste functionality broke after installing the September 2026 KB5002914 security update, but Microsoft has since released a fix.

  9 reports · 2 admins · last seen 9/18/2026 · sources →

• [BREAKS-PROD]
  RDPKB5122871

  Remote Desktop Services might stop responding on Windows Server 2025 after installing KB5122871 due to instability.

  8 reports · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  RDPKB5122878

  Remote Desktop Services might stop responding on Windows 10, version 22H2 devices after installing KB5122878.

  8 reports · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  RDPKB5122882

  Remote Desktop Services might stop responding on Windows Server 2022 after installing KB5122882.

  8 reports · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  RDPKB5122880

  Remote Desktop Services might stop responding on Windows 11 23H2 devices after installing KB5122880.

  8 reports · 1 admin · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  Hyper-VKB5122880

  Host folder shares are unavailable in Hyper-V-based Linux VMs after installing the September 2026 security update KB5122880 on Windows 11, version 23H2.

  8 reports · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding on Windows 11 24H2 after September 2026 security update KB5124008, causing instability.

  4 reports · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  RDP

  RDS servers are experiencing issues after installing the September 2026 updates, impacting functionality for RDS farms.

  3 reports · 2 admins · last seen 9/11/2026 · sources →

• [WORKAROUND]
  Active DirectoryKB5124008

  Credential Guard protected machines on Windows 11 24H2 with KB5124008 cannot sign in interactively with domain credentials due to trust relationship loss.

  3 reports · 2 admins · last seen 9/16/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates break RDP connections, logging users out and preventing re-login on all Windows versions.

  1 report · last seen 9/12/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates cause Remote Desktop Services (RDS) failures on Windows Server systems.

  1 report · 1 admin · last seen 9/14/2026 · sources →

• [BREAKS-PROD]
  Hyper-VKB5122878

  Plan9 host folder shares might not appear in Hyper-V Linux guests after the September 2026 security update KB5122878.

  1 report · 1 admin · last seen 9/14/2026 · sources →

• [BREAKS-PROD]
  RDP

  September updates cause Remote Desktop Services (RDS) failures on Windows Server systems.

  1 report · last seen 9/14/2026 · sources →

• [BREAKS-PROD]
  RDP

  RDS servers are experiencing issues after installing the September updates, impacting farms.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding on Windows 11 25H2 after installing KB5124008.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  RDPKB5124008

  Remote Desktop Services might stop responding on Windows 11, version 24H2 after installing KB5124008.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 Windows security updates break RDP connections, logging users out and preventing re-login; Microsoft confirmed the bug and provided a KIR solution.

  1 report · last seen 9/14/2026 · sources →

• [WORKAROUND]
  Outlook

  Copilot and Copilot Chat buttons are missing in Classic Outlook for some Windows users, a known issue Microsoft is investigating.

  1 report · 1 admin · last seen 9/16/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates are causing Remote Desktop Services (RDS) failures on Windows Server 2019, 2022, and 2025, preventing user connections and sometimes requiring hard resets.

  1 report · 1 admin · last seen 9/10/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates cause RDP connections to stop working, logging users out and preventing re-login across all Windows versions.

  1 report · last seen 9/12/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding after a September 2026 security update on Windows 11 25H2, causing instability.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  OtherSeptember updates

  RDS servers are experiencing issues after installing the September updates.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding after the Sept 2026 security update (KB5124008) on Windows 11 24H2, causing RDS instability.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates break RDP connections, logging users out and preventing re-login on all Windows versions.

  1 report · last seen 9/12/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates for Windows Server 2019/2022/2025 break Remote Desktop Services, preventing user connections and sometimes requiring hard resets.

  1 report · 1 admin · last seen 9/10/2026 · sources →

• [BREAKS-PROD]
  Outlook

  Teams and Outlook failed to launch on ARM Windows devices after August 2026 Patch Tuesday updates.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates are causing Remote Desktop Services (RDS) failures on Windows Server 2019, 2022, and 2025 servers, preventing users from connecting.

  1 report · 1 admin · last seen 9/10/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates break RDP connections, logging users out and preventing further logins. Microsoft has confirmed the issue affects all Windows versions.

  1 report · last seen 9/12/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding after Sept. 2026 security update KB5124008 on Windows 11, version 25H2, causing RDS instability.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding after KB5124008 on Windows 11, version 24H2, causing instability. Issue is mitigated.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates are causing Remote Desktop Services (RDS) failures on Windows Server 2019, 2022, and 2025, preventing user connections.

  1 report · 1 admin · last seen 9/10/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding on Windows 11 25H2 devices after installing KB5124008, causing instability for users trying to connect.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding on Windows 11, version 24H2 after installing KB5124008, causing RDS instability.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates for Windows Server 2019, 2022, and 2025 are causing Remote Desktop Services failures, preventing user connections and sometimes requiring hard resets.

  1 report · 1 admin · last seen 9/10/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates cause RDP connections to fail, logging users out and preventing re-login across all Windows versions.

  1 report · last seen 9/12/2026 · sources →

• [BREAKS-PROD]
  RDP

  Emergency out-of-band updates released to fix Remote Desktop Services failures, Hyper-V, and USB audio problems caused by recent security updates.

  1 report · 1 admin · last seen 9/14/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding on Windows 11 (25H2) devices after installing KB5124008.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding after the September 2026 security update KB5124008 on Windows 11, version 24H2, causing RDS instability.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  Outlook

  Teams and Outlook failed to launch on ARM Windows PCs after installing August 2026 Patch Tuesday updates.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [BREAKS-PROD]
  RDP

  September 2026 security updates are causing Remote Desktop Services (RDS) connections to stop working, logging users out and preventing re-login on all Windows versions.

  1 report · last seen 9/12/2026 · sources →

• [BREAKS-PROD]
  RDPKB5124008

  Remote Desktop Services might stop responding on Windows 11 25H2 after the September 2026 security update KB5124008.

  1 report · 1 admin · last seen 9/11/2026 · sources →

• [WORKAROUND]
  RDPKB5124008

  Remote Desktop Services might stop responding after Sept. 2026 security update KB5124008, affecting Windows 11 24H2 devices with RDS enabled.

  1 report · 1 admin · last seen 9/11/2026 · sources →