Windows 11 · 26H1 · Release · Security update (Patch Tuesday)
Windows 11, version 26H1 (28000.3231)
- Release
- KB5127646 — Microsoft's article, opens in a new tab
- amd64
- arm64
Windows 11 26H1: For specific new hardware; not a feature update for existing PCs
Microsoft release information · Verified Oct 13, 2026
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Microsoft's known issues — KB5127646
- Issue Known issue Symptoms After installing the September 8, 2026, Windows security update (KB5124012), some USB Audio Class 1.0 devices might fail to start or produce audio. Affected devices might experience one or more of the following symptoms: The device displays an error in Device Manager: "This device cannot start (Code 10).” No audio output. Volume controls are unresponsive or remain at zero. Sound settings are unresponsive or unavailable. Some devices might function in standard stereo configurations but fail when using multichannel audio features, including 8-channel or 3D audio modes. Some customers have reported that they're able to restore audio in these cases by switching to 2-c Workaround: This issue is partially resolved in the out-of-band (OOB) update released on September 14, 2026, (KB5129194) . This OOB update resolves the symptoms experienced on devices using 8-channel or 3D audio modes. Microsoft is working to address the other symptoms and will provide more information when it is available. IT administrators who need an immediate workaround for the symptoms not addressed yet by the OOB update should contact Microsoft Support for Business for assistance.
Known issues — reported on the forum
In the news
- Coverage CISA KEV Adds Exploited Windows MOTW Bypass and Ivanti Connect Secure Flaw
- Issue Windows 11 KB5127648 October 2026 Update Fixes VPN, AVD and Storage Issues
- Fix October 2026 Patch Tuesday: Excel paste finally fixed, File History restored, and 24H2 Home/Pro gets its last update
- Coverage Windows 11 October 2026 Update: 24H2 Home/Pro Support Ends, File Explorer and Copilot Key Changes
Discussed on the forum
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