CVE-2025-54098: Windows 10 1507 Privilege Escalation Flaw

CVE-2025-54098 Overview

CVE-2025-54098 is an improper access control vulnerability in Windows Hyper-V that allows an authenticated local attacker to elevate privileges. The flaw is classified under [CWE-284] (Improper Access Control) and affects a broad range of Windows client and server versions that ship the Hyper-V role or hypervisor components. Successful exploitation lets a low-privileged user gain higher privileges on the host, breaking the isolation model that Hyper-V is designed to enforce. Microsoft published the advisory on September 9, 2025, and addressed the issue through its security update channel.

Critical Impact
An authorized local attacker can escalate privileges on a Hyper-V host, compromising confidentiality, integrity, and availability of the system and hosted workloads.

Affected Products

Microsoft Windows 10 (1507, 1607, 1809, 21H2, 22H2)
Microsoft Windows 11 (22H2, 23H2, 24H2)
Microsoft Windows Server 2008 R2 SP1, 2012, 2012 R2, 2016, 2019, 2022, 2022 23H2, and 2025

Discovery Timeline

2025-09-09 - CVE-2025-54098 published to NVD
2025-09-09 - Microsoft releases security advisory and patch
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-54098

Vulnerability Analysis

Hyper-V is Microsoft's Type-1 hypervisor, providing hardware-assisted virtualization for Windows client and server systems. The vulnerability resides in access control logic that governs how a local, authenticated user interacts with Hyper-V components on the host. An attacker holding low privileges can invoke functionality that should be restricted to higher-privileged principals, gaining the ability to execute code or perform operations in a more privileged context.

The attack is local and requires low complexity and low privileges, with no user interaction needed. Because Hyper-V ships as a Windows platform feature, the vulnerable code is present across more than a decade of supported Windows Server and client releases, giving the issue a wide footprint in enterprise environments.

Root Cause

The root cause is improper access control [CWE-284] within Hyper-V. A privileged code path does not adequately validate that the caller holds the required authorization before performing sensitive operations. Because Hyper-V mediates access to virtualization primitives and host resources, an authorization gap directly translates into a privilege boundary violation between a standard local user and higher-privileged host contexts.

Attack Vector

Exploitation requires a local, authenticated foothold on a Windows system with Hyper-V components present. From that foothold, the attacker interacts with the affected Hyper-V interface or object using standard local APIs to trigger the improperly guarded operation. Successful exploitation yields elevated privileges on the host, which can be used to disable defenses, access other tenants' virtual machines, or establish persistence. Microsoft does not indicate public exploitation, and CISA has not added the CVE to the Known Exploited Vulnerabilities catalog. See the Microsoft Vulnerability Advisory CVE-2025-54098 for vendor technical details.

Detection Methods for CVE-2025-54098

Indicators of Compromise

Unexpected creation of privileged processes or services by non-administrative user sessions on Hyper-V hosts.
Anomalous access to Hyper-V management interfaces such as vmms.exe, vmcompute.exe, or \\.\VidSup device objects from standard user contexts.
Local privilege escalation artifacts: token duplication, new local admin accounts, or modifications to the BUILTIN\Hyper-V Administrators group.

Detection Strategies

Monitor Windows Security event logs for privilege changes (Event IDs 4672, 4673, 4674) originating from low-privileged accounts on Hyper-V hosts.
Alert on abnormal child processes spawned by Hyper-V service binaries, particularly cmd.exe, powershell.exe, or rundll32.exe under SYSTEM following a standard-user trigger.
Correlate Hyper-V-Worker and Hyper-V-Hypervisor operational logs with user session data to identify unauthorized interactions.

Monitoring Recommendations

Inventory all hosts with the Hyper-V role or Windows Sandbox/WSL2 platform enabled, since these enable the vulnerable components.
Track patch state for the September 2025 Microsoft security update across all affected Windows client and server SKUs.
Baseline normal Hyper-V administrative activity and alert on deviations from known operators and maintenance windows.

How to Mitigate CVE-2025-54098

Immediate Actions Required

Apply the Microsoft security update referenced in the MSRC advisory for CVE-2025-54098 to all affected Windows versions.
Prioritize patching on Hyper-V hosts running production virtual machines and on multi-tenant infrastructure.
Audit local account membership and remove unnecessary interactive logon rights on hypervisor hosts.

Patch Information

Microsoft addressed CVE-2025-54098 through cumulative security updates released via Windows Update, WSUS, and the Microsoft Update Catalog. Refer to the Microsoft Vulnerability Advisory CVE-2025-54098 for the specific KB article and build numbers for each Windows version. Server 2008 R2 and 2012/2012 R2 updates are delivered under the Extended Security Updates program.

Workarounds

Restrict interactive and remote logon on Hyper-V hosts to trusted administrators only, reducing the population of accounts that can attempt local exploitation.
Where Hyper-V is not required, disable the role using Disable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V and remove dependent features such as Windows Sandbox and WSL2.
Enforce application control (WDAC or AppLocker) to block untrusted binaries from executing on hypervisor hosts until patches are deployed.

bash

# Check Hyper-V feature state and Windows patch level on affected hosts
Get-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V-All
Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 10