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Known update issues

KB5122871 – known issues and fixes

KB5122871 is a Microsoft update from Patch Tuesday September 2026, released on 8 Sep 2026. According to the Security Update Guide it fixes 655 vulnerabilities (Windows). Affected according to our entries: Microsoft Windows Server 2025, Windows 11 26H2/25H2/24H2, Windows Server 2019, Microsoft Windows 11, Version 26H2. Known issues with this update: 1 open, 1 with workaround.

1Open
1Workaround
0Fixed
655Vulnerabilities fixed

← All known issues

Known issues with KB5122871

OpenKnown issueCommunity report

Windows 11/Server 2025: USB Audio Class 1.0 devices fail (Code 10) or give no sound

USB Audio Class 1.0 devices reportedly fail with Code 10 or produce no sound on Windows 11 and Windows Server 2025. This is reported by users, not yet confirmed by the vendor. No permanent fix has been found; a third-party page claims the Windows Server 2022 update KB5126655 fixes it, which is unverified.

Microsoft · Windows Server 2025, Windows 11 26H2/25H2/24H2, Windows Server 2019

WorkaroundKnown issue

Windows 11 26H2: USB audio devices might fail to start or produce no sound

Some USB Audio Class 1.0 devices might fail to start or produce no audio after installing Windows 11, version 26H2. Microsoft lists the same issue for other Windows client and server versions, where it originates from the September 8, 2026 security updates. For 26H2 the vendor status is Mitigated and a fix in a future Windows update is still being worked on.

Microsoft · Windows 11, Version 26H2

Where the information comes from

We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:

  • Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
  • other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
  • community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
  • targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
  • early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online

Summary and translation with AI (Claude by Anthropic) – without any data of visitors.

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