Schedule normally
No exploitation observed: not in the CISA KEV catalog, EPSS 1%.
Fixed by KB5040427 and 11 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.
Do this now: Deploy with your normal update cycle. This page refreshes daily; the verdict changes the day the data does.

Patch tracker / CVE reference / CVE-2024-38191

CVE-2024-38191

CVE-2024-38191 is a high severity Microsoft vulnerability with a CVSS score of 7.8. Microsoft has shipped the fix: deploy one of the 12 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High
7.8
CVSS v3
1.2%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability 1.2%. CVSS 7.8 (High).

This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2024-38191

This kernel streaming service driver escalation is the low-scored cousin of the Critical kernel streaming bugs from the same period, affecting Windows 10 Version 1809 and Windows Server 2019 at High Severity (CVSS 7.8) with a 1 percent EPSS probability. Different score, same driver, same fix vehicle. Its presence confirms how thoroughly this component was picked over by researchers.

Do this: Verify the month's cumulative update on the 1809 branch, which resolves this along with the rest of the kernel streaming findings.

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

Senserva AI Opinion and rich prompt for CVE-2024-38191

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

Official patch(es) for CVE-2024-38191

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5040427, KB5040430, KB5040431, KB5040434, KB5040437, KB5040448, KB5040456, KB5040485, KB5040490, KB5040497, KB5040498, KB5040499 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.

Apply the Microsoft security updates below to fix CVE-2024-38191. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.

KB5040427KB5040430KB5040431KB5040434KB5040437KB5040448KB5040456KB5040485KB5040490KB5040497KB5040498KB5040499

Scope and sources

Affected products
Fixed by the same updates
CVE-2024-38184CVE-2024-38185CVE-2024-38186CVE-2024-38187CVE-2024-38161
Authoritative references
Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See 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.
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