Windows Kernel-Mode Driver Remote Code Execution Vulnerability

Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to execute code over a network.

Read the vendor bulletin Get alerts for Windows Server 2025 (Server Core installation)

8.0CVSS out of 10High severity

Scope

What the vendor says is affected

Windows Server 2025 (Server Core installation)
Windows Server 2025

Versions the vendor lists as fixed

10.0.26100.32860
10.0.26100.32772

Next step

What the vendor recommends

Install KB5087539. Install KB5087423.

Review the complete instructions on the vendor's site

Timeline

When this advisory changed

May 12, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 27, 2026 at 11:11 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-34332View CVSS, KEV, EPSS, and threat context

Source

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Vendor: Microsoft Security Response Center
Advisory ID: CVE-2026-34332
Last source check: Sep 27, 2026 at 11:11 PM UTC

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Your environment

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Test the update or mitigation through your normal change process.

Watch Windows Server 2025 (Server Core installation)

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What the vendor says is affected

Versions the vendor lists as fixed

What the vendor recommends

When this advisory changed

CVEs named in this advisory

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