CVE-2024-38264: Microsoft Virtual Hard Disk (VHDX) Denial of Service Vulnerability

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-12 · updated 2026-06-17
Weakness: CWE-591

Description

Microsoft Virtual Hard Disk (VHDX) Denial of Service Vulnerability

Affected products

Microsoft Windows 11: before 10.0.22621.4460 — fixed in 10.0.22621.4460
Microsoft Windows 11: before 10.0.22631.4460 — fixed in 10.0.22631.4460
Microsoft Windows 11: before 10.0.26100.2314 — fixed in 10.0.26100.2314
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1251 — fixed in 10.0.25398.1251
Microsoft Windows Server 2025: before 10.0.26100.2314 — fixed in 10.0.26100.2314
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.4460 — fixed in 10.0.22621.4460
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.4460 — fixed in 10.0.22631.4460
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.4460 — fixed in 10.0.22631.4460
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.2314 — fixed in 10.0.26100.2314
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1251 — fixed in 10.0.25398.1251
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.2314 — fixed in 10.0.26100.2314

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.22621.4460; Microsoft Windows 11 10.0.22631.4460; Microsoft Windows 11 10.0.26100.2314; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1251; Microsoft Windows Server 2025 10.0.26100.2314; Microsoft Windows 11 10.0.22621.4460; Microsoft Windows 11 version 22H3 10.0.22631.4460; Microsoft Windows 11 10.0.22631.4460; Microsoft Windows 11 10.0.26100.2314; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1251; Microsoft Windows Server 2025 10.0.26100.2314. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38264

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