EUVD-2026-44271
GHSA-7gm6-68gc-836h
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Guest-to-host path is adjacent rather than truly remote (AV:A), UAF needs a memory-reuse race (AC:H), and a guest foothold is required (PR:L), with full host impact and scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows VMSwitch allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating from a guest partition corrupt kernel memory via a use-after-free and gain higher privileges, with a scope change (S:C) indicating a guest-to-host escape. Rated CVSS 9.9 and affecting a broad range of Windows client and server releases from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through 2025, this issue was reported by Microsoft and has a vendor patch available. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated foothold able to interact with the Hyper-V VMSwitch driver - in practice, code execution inside a guest VM or another low-privilege context on a host running the Hyper-V virtual switch (CVSS PR:L confirms a low privilege level is needed, not unauthenticated access). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are largely consistent and point to a genuine high priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already compromised or been granted access to a low-privilege guest VM on a Hyper-V host sends crafted virtual network operations that trigger the use-after-free in vmswitch.sys, grooming kernel memory to reclaim the freed object with attacker-controlled data. Successful exploitation corrupts host-partition kernel memory and escalates from guest context to SYSTEM-level control of the host, breaking VM isolation. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security updates for CVE-2026-57092 to every affected client and server SKU via the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57092, prioritizing Hyper-V hosts and any Windows Server systems running the Hyper-V role. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running Windows Hyper-V across your infrastructure, including Windows 10 (1607 through current), Windows 11, and Windows Server (2012 through 2025), and catalog which systems host production workloads or untrusted guest VMs. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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