EUVD-2026-56610
GHSA-3gjf-837m-wxcw
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack requiring low-privilege credentials and high complexity race condition; no scope change; full CIA impact reflects kernel-level code execution post-exploitation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Virtual Hard Disk (VHD) Miniport Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows Virtual Hard Disk (VHD) Miniport Driver affects Windows 10, 11, and Server 2016 through 2025, enabling a low-privileged local attacker to achieve full kernel-level control via a use-after-free memory corruption in a kernel-mode driver. The CVSS AC:H rating indicates the exploit path likely requires precise timing - consistent with a race condition in driver memory management - which reduces but does not eliminate real-world risk. No public exploit code or CISA KEV listing has been identified at time of analysis; a vendor patch from Microsoft is available.
Technical ContextAI
The Windows VHD (Virtual Hard Disk) Miniport Driver is a kernel-mode storage driver responsible for virtualizing disk I/O, used in Hyper-V, Windows Sandbox, disk imaging, and VHD/VHDX attachment workflows. CWE-416 (Use After Free) describes a class of memory-safety flaw where code continues to reference a memory object after it has been freed, allowing an attacker who can control heap layout to substitute attacker-controlled data into the reclaimed region and redirect kernel code execution. Because the driver operates in kernel space, successful exploitation yields NT AUTHORITY\SYSTEM-level privileges. The CVSS AC:H metric implies exploitation is not deterministic - a race condition or other timing-dependent condition is the most likely trigger, requiring the attacker to win a narrow execution window or retry repeatedly. The EUVD data confirms the flaw spans CPE-equivalent builds across Windows 10 1607 through Windows 11 26H1 and all major Windows Server releases from 2016 through 2025.
RemediationAI
Apply the vendor-released security update from Microsoft via Windows Update, Windows Server Update Services (WSUS), or the Microsoft Update Catalog, targeting the fixed build for each respective OS version - for example, 10.0.26100.9168 for Windows 11 24H2, 10.0.19045.7663 for Windows 10 22H2, 10.0.20348.5499 for Windows Server 2022, and 10.0.26100.33296 for Windows Server 2025. The authoritative patch reference is the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59125. Where immediate patching is operationally blocked, restrict local interactive and remote desktop logon rights on sensitive systems to the minimum required user set, reducing the pool of principals who could supply the required low-privilege foothold. On Hyper-V and VDI hosts, consider limiting which accounts are permitted to create or attach VHD/VHDX files, as elevated VHD driver activity may increase exploitability window; note this is not a confirmed Microsoft-endorsed mitigation and should not substitute for patching. No complete vendor-documented workaround has been identified.
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today