Patch tracker / KB5040438

KB5040438: Windows 11 Version 22H2 for x64-based Security Update (September 2024)

KB5040438 is a High security update for Windows 11 Version 22H2 for x64-based , released 2024-09-10. It closes 1 CVE with a maximum CVSS of 7.3. It is the 30th largest of the 45 updates Microsoft shipped that month, by CVEs closed.

Update summary

High
2024-09-10
Released
1
CVEs fixed
7.3
Max CVSS v3
High
Severity
Deploy this cycle
Fixes 1 CVE for Windows 11 Version 22H2 for x64-based . No confirmed in-the-wild exploitation in this set today.

Fixes 1 CVE. Most severe CVSS 7.3 (High). EPSS exploit probability up to <1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.

Senserva found thiswe track every release for this product line, so we can tell you this package is behind

A newer security update for Windows 11 Version 22H2 for ARM64-based Systems has shipped since this one: KB5060525 (2025-06-10). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.

Microsoft Update Catalog: download KB5040438Microsoft support article
Senserva AI Opinion for KB5040438

KB5040438 is a September 2024 companion update for Windows 11 22H2 and 23H2, fixing six of the same batch of CVEs covered by that month's larger release, topped by High severity CVSS 7.8. It applies across both ARM64 and x64 builds, and while none of the six is in CISA KEV or tied to ransomware today, six distinct flaws in one update is enough surface to prioritize over optional patches. Endpoints on 22H2 or 23H2 that skip this stay exposed to all six.

Do this: Include KB5040438 in the current Windows 11 22H2/23H2 rollout alongside other September 2024 updates.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5040438

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

Full tracking and change history for KB5040438

Released
2024-09-10
Last changed
2026-08-07
Changes tracked
4

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 KB5040438 is installed

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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-2024-43495High7.3<1%No

Scope and sources

Affected products
Also released in September 2024

KB5043083

24 CVEs · Critical · exploited

KB5042880

37 CVEs · High · exploited

KB5042881

37 CVEs · High · exploited

KB5043049

2 CVEs · High · exploited

KB5043050

36 CVEs · High · exploited

KB5043051

37 CVEs · High · exploited

KB5043055

37 CVEs · High · exploited

KB5043064

29 CVEs · High · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5040438 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.