Patch tracker / KB5129194

KB5129194: Windows 10 Version 1809 for 32-bit Sys Security Update (September 2026)

KB5129194 is a High security update for Windows 10 Version 1809 for 32-bit Sys, released 2026-09-08. It closes 2 CVEs with a maximum CVSS of 8.2. The most likely of them to be attacked is CVE-2026-62721, which FIRST.org rates at 6% probability of exploitation in the next 30 days.

Update summary

High
2026-09-08
Released
2
CVEs fixed
8.2
Max CVSS v3
High
Severity
Deploy this cycle
Fixes 2 CVEs for Windows 10 Version 1809 for 32-bit Sys. No confirmed in-the-wild exploitation in this set today.

Fixes 2 CVEs. Most severe CVSS 8.2 (High). EPSS exploit probability up to <1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.

Senserva found thisread these before you deploy broadly

Microsoft documents 1 known issue with this update.

  • USB Audio Class 1.0 devices with error Code 10 or no output

The full text, quoted from Microsoft

Microsoft Update Catalog: download KB5129194Microsoft support article
Senserva AI Opinion and rich prompt for KB5129194

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for KB5129194

Released
2026-09-08
Last changed
2026-09-08
Changes tracked
1

Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.

Check if KB5129194 is installed

Elevated PowerShell. No output means it is not installed.

Known issues, from Microsoft

Quoted from Microsoft's support article for KB5129194 (checked 2026-09-15). Verify against the article before acting.

USB Audio Class 1.0 devices with error Code 10 or no output

Symptoms

After installing the September 8, 2026, Windows security update, 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.

This issue is limited to USB Audio Class 1.0 devices.

Resolution

Microsoft is working on a resolution and will update this documentation when more information is available.

CVEs fixed by this update

Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.

CVESeverityCVSSEPSSExploited
CVE-2026-85921High8.2<1%No
CVE-2026-62721High7.86.2%No

Scope and sources

Affected products
Also released in September 2026

KB5122871

679 CVEs · Critical · exploited

KB5122876

616 CVEs · Critical · exploited

KB5122878

568 CVEs · Critical · exploited

KB5122880

602 CVEs · Critical · exploited

KB5122882

641 CVEs · Critical · exploited

KB5123065

393 CVEs · Critical · exploited

KB5123066

418 CVEs · Critical · exploited

KB5123099

555 CVEs · Critical · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5129194 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.