Patch tracker / CVE reference / CVE-2026-42915

CVE-2026-42915

CVE-2026-42915 is a critical severity Microsoft vulnerability with a CVSS score of 9.8. Its EPSS score puts the probability of exploitation in the next 30 days at 54%. Microsoft has shipped the fix: deploy one of the 6 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

Critical

9.8

CVSS

54%

EPSS, 30 days

Critical

Severity

Not in the CISA KEV catalog. EPSS exploit probability 54%. CVSS 9.8 (Critical).

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

Senserva AI Opinion for CVE-2026-42915

CVE-2026-42915 is a Denial of Service flaw in the Windows VMSwitch component, the virtual switch that carries network traffic for Hy-V virtual machines on Windows Server 2022 and Windows 10 Version 21H2. A CVSS score of 9.8 is unusual for a Denial of Service issue and suggests network-reachable, unauthenticated triggering that could take down the switch and every VM depending on it. With a 48 percent EPSS probability and no CISA KEV listing yet, this is a high-likelihood target that has not been confirmed exploited in the wild.

Do this: Apply Microsoft's patch for CVE-2026-42915 to your Hyper-V hosts running Windows Server 2022 and Windows 10 21H2 first, prioritizing hosts carrying production VM workloads.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-42915

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

I am an IT admin assessing a vulnerability. Facts for CVE-2026-42915 (source: https://senserva.com/cve/CVE-2026-42915.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2026-42915: Critical severity Microsoft vulnerability, CVSS 9.8
- EPSS 30-day exploitation probability: 54%
- Actively exploited (CISA KEV): no
- Fixed by: KB5093998, KB5094125, KB5094126, KB5094127, KB5094128, KB5095051
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) What to patch or mitigate first. 4) How to check whether my devices are exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch this cycle

Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 54%).

Fixed by KB5093998 and 5 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Patch in this maintenance window; do not let it slip to the next one.

Official patch(es) for CVE-2026-42915

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5093998, KB5094125, KB5094126, KB5094127, KB5094128, KB5095051 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-2026-42915. 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.

KB5093998 KB5094125 KB5094126 KB5094127 KB5094128 KB5095051

Scope and sources

Affected products

Fixed by the same updates

CVE-2026-40378 CVE-2026-42982 CVE-2026-42990 CVE-2026-44800 CVE-2026-48571 CVE-2026-48572 CVE-2024-43582 CVE-2024-49075

Authoritative references

Official CVE record (cve.org)NVD detail Microsoft MSRC FIRST.org EPSS

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