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. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
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. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 10 Version 1607
View allLocal privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-a
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Local code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and s
Elevation of privilege in the Windows NTFS file-system driver lets an already-authenticated local user escalate to SYSTE
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthoriz
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary co
Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
View allShare
External POC / Exploit Code
Leaving vuln.today