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USB Audio Class 1.0 Code 10 / no sound after KB5124008

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Direct answer

Microsoft tracks a USB Audio Class 1.0 failure affecting startup, sound and controls. The current vendor state is mitigated. On Windows 11 24H2/25H2, KB5129195 fixes the 8-channel/3D audio subset; it does not establish that Code 10 or every no-sound symptom is resolved.

Mitigated Microsoft [1] · Microsoft [2] · Microsoft [3] · Microsoft [4]

Check affected environmentsFind a remedy for your version

Status
Mitigated FACT
Affected
Windows 11 (5 versions); Windows 10 (4 versions); Windows Server (6 versions) · Version table
First observed
Unknown
Last verified
Confidence
Vendor confirmed
Severity
Unknown

TraceCheck interpretation

Does this explain your situation?

Use these checks to interpret the source. This is a reading guide, not a device test or a vendor diagnosis.

  1. Match the class and the symptom

    Confirm that the hardware uses USB Audio Class 1.0. This record cannot diagnose Bluetooth, HDMI or every USB audio failure. Keep startup/Code 10 symptoms separate from failure only in multichannel playback.

    Microsoft [1] · Microsoft [2]

  2. Treat the September 14 fix as partial

    For 24H2/25H2, KB5129195 targets the 8-channel/3D subset. Continued Code 10 or no-sound symptoms do not contradict that narrower fix. This record remains mitigated and has no full-resolution date. The KB5124008 article’s USB section names KB5124012, while the 24H2/25H2 release-health entries associate KB5124008. This record follows the version-specific release-health mapping; confirm the package for your OS.

    Microsoft [1] · Microsoft [2] · Microsoft [3] · Microsoft [4]

  3. Escalate unresolved symptoms with the right scope

    Microsoft directs IT administrators needing an immediate workaround to Microsoft Support for Business. The 26H2 entry has no originating KB; do not carry the 24H2 package into that environment. Record the OS version, device class and failing mode for a support request.

    Source: Microsoft

Symptoms

  • A device may show Code 10, produce no sound, or have volume or sound controls that cannot be used. Source: Microsoft
  • Some devices work in stereo but fail in 8-channel or 3D audio configurations. Source: Microsoft

Affected environments

Evidence-backed affected targets. An omitted dimension has no recorded conclusion.
EntityVersionOriginating updateDevice classEvidence
Windows 1126H2UnknownUSB Audio Class 1.0Source: Microsoft
Windows 1126H1UnknownUSB Audio Class 1.0Source: Microsoft
Windows 1125H2KB5124008USB Audio Class 1.0Microsoft [1] · Microsoft [2]
Windows 1124H2KB5124008USB Audio Class 1.0Microsoft [1] · Microsoft [2]
Windows 1123H2UnknownUSB Audio Class 1.0Source: Microsoft
Windows 1022H2UnknownUSB Audio Class 1.0Source: Microsoft
Windows 1021H2UnknownUSB Audio Class 1.0Source: Microsoft
Windows 10Enterprise LTSC 2019UnknownUSB Audio Class 1.0Source: Microsoft
Windows 10Enterprise LTSC 2016UnknownUSB Audio Class 1.0Source: Microsoft
Windows Server2025UnknownUSB Audio Class 1.0Source: Microsoft
Windows Server2022UnknownUSB Audio Class 1.0Source: Microsoft
Windows Server2019UnknownUSB Audio Class 1.0Source: Microsoft
Windows Server2016UnknownUSB Audio Class 1.0Source: Microsoft
Windows Server2012 R2UnknownUSB Audio Class 1.0Source: Microsoft
Windows Server2012UnknownUSB Audio Class 1.0Source: Microsoft

What caused it?

Root cause has not been confirmed.

Fixes and workarounds

A version match identifies recorded guidance, not a diagnosis or a guarantee. Check the symptom, device and application requirements in each source before proceeding.

Update for the 8-channel / 3D audio subset

FACT Official fix · vendor fix

KB5129195 corrects the multichannel subset on Windows 11 24H2/25H2. Other documented startup, no-sound and control symptoms remain outside this partial resolution. The cited update is historical; select the applicable current update for the device.

Partial fix — remaining symptoms are unresolved

Applies to: Windows 11 24H2, Windows 11 25H2.

Risk: medium (TraceCheck editorial assessment, not a vendor success rate)

Verification:

Partial fixing update: KB5129195 · Source: Microsoft

Read Microsoft's instructions ↗

Current status

Mitigated This is the recorded state as of the last verification, not a live device diagnosis. Microsoft [1] · Microsoft [2] · Microsoft [3] · Microsoft [4]

Vendor acknowledgement / confirmation: .

Updates linked to documented corrections: KB5129195

For the recorded vendor guidance, see USB audio — Windows 11 25H2 release healthUSB multichannel partial fix — KB5129195USB audio — Windows 11 26H2 release healthUSB audio acknowledgement — Windows 11 24H2 release health.

Evidence

  1. USB audio — Windows 11 25H2 release health

    Microsoft · Vendor documentation

    Supports: Mitigated status and partial symptom coverage, with the linked September update.

    Retrieved

  2. USB multichannel partial fix — KB5129195

    Microsoft · Vendor documentation

    Supports: Only the 8-channel/3D subset is corrected; other audio symptoms remain unresolved.

    Retrieved

  3. USB audio — Windows 11 26H2 release health

    Microsoft · Vendor documentation

    Supports: USB Audio Class 1.0 symptom boundary, complete affected-platform list, no originating KB for 26H2 and support escalation.

    Retrieved

  4. USB audio acknowledgement — Windows 11 24H2 release health

    Microsoft · Vendor documentation

    Supports: The 24H2 entry opened September 25 and is mitigated, with a partial September 14 correction.

    Retrieved

  5. USB originating-KB discrepancy — KB5124008 article

    Microsoft · Vendor documentation

    Supports: The USB subsection names KB5124012 whereas the reviewed Windows 11 24H2/25H2 release-health records associate KB5124008. The inconsistency is disclosed without assuming a typo.

    Retrieved

Change history

  1. Mitigated

    The reviewed 24H2 entry is mitigated and describes a partial September 14 fix. Its opened date is later than that update, so no earlier confirmed state is invented.

    Source: Microsoft

Resolved Resolution recorded 2026-09-14

Claude Cowork / WSL host folders missing after KB5124008

Microsoft confirmed a Plan9 host-folder sharing failure in HCS-managed Linux VMs after the September 2026 Windows security update. Claude Cowork and WSL are named examples. For Windows 11 24H2/25H2, KB5129195 and subsequent updates resolve the issue; ordinary Hyper-V VMs without Plan9 are outside this documented scope.

6 documented versions across Windows 11, Windows 10 · Affected environments

Recorded update fix: Documented symptom resolution · Windows 11 24H2, Windows 11 25H2 · Check instructions

FACT Vendor confirmed · Source checked

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