Windows DirectX Graphics Kernel (DXGKRNL) Elevation of Privilege Vulnerability (CVE-2018-8406)
Executive & SecOps Summary
SECOPS ASSESSMENTWindows 10, Windows Server 2016, and Windows 10-based Servers.
A local attacker can execute arbitrary code in kernel mode, leading to complete system takeover (SYSTEM privileges).
Apply the official Microsoft security patches immediately and restrict local access on unpatched systems.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the latest cumulative security updates via Windows Update or Microsoft Update Catalog. Use the following PowerShell commands to automate the update process.
# Install and force Windows Update using PSWindowsUpdate module
Install-Module PSWindowsUpdate -Force -Verbose
Get-WindowsUpdate -AcceptAll -Install -AutoReboot2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, restrict local interactive logon sessions and disable unnecessary local accounts to minimize the attack surface.
# Disable local Guest account and restrict Remote Desktop (RDP) access
Disable-LocalUser -Name 'Guest'
Set-ItemProperty -Path 'HKLM:\System\CurrentControlSet\Control\Terminal Server' -Name 'fDenyTSConnections' -Value 13. Log Audit & IoC Verification Commands
Verify the operating system build and the version of the DXGKRNL driver to determine vulnerability status.
# Retrieve OS build details and dxgkrnl.sys driver version
Get-ComputerInfo | Select-Object OsName, OsHardwareAbstractionLayer
Get-ItemProperty -Path 'C:\Windows\System32\drivers\dxgkrnl.sys' | Select-Object -ExpandProperty VersionInfoBlock Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
An elevation of privilege vulnerability exists in the DirectX Graphics Kernel (DXGKRNL) driver due to improper handling of objects in memory (CWE-404). The root cause lies in the driver's failure to properly validate and manage the lifecycle of specific graphics objects, leading to memory corruption or use-after-free conditions in kernel space.
2. Exploitation Mechanics & Attack Scenario
To exploit this vulnerability, an attacker must first gain local access to the target system with low-privileged user credentials. The attacker then executes a specially crafted application designed to interact with the DXGKRNL API, triggering the memory handling flaw to execute arbitrary code with elevated kernel-mode privileges.
3. Infrastructure & Business Impact
As a CISA KEV-listed vulnerability, this flaw has been actively exploited in the wild. Successful exploitation allows an attacker to bypass all user-mode security boundaries, compromise the entire operating system, disable endpoint security controls, and establish persistent access within the infrastructure.
Official Vendor Advisories & References
An elevation of privilege vulnerability exists when the DirectX Graphics Kernel (DXGKRNL) driver improperly handles objects in memory, aka "DirectX Graphics Kernel Elevation of Privilege Vulnerability." This affects Windows Server 2016, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8400, CVE-2018-8401, CVE-2018-8405.
Frequently Asked SecOps Questions (CVE-2018-8406)
FAQQ1. How critical is CVE-2018-8406 and is it actively exploited in the wild?
CVE-2018-8406 is rated CVSS 7.8 (HIGH) with a 30-day EPSS exploitation probability of 3.4%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2018-8406?
Primary impacted vendors include microsoft across windows, windows_server. Scope summary: Windows 10 (Versions 1607, 1703, 1709, 1803, etc.), Windows Server 2016, and Windows 10 Servers
Q3. What temporary mitigations or workarounds exist for CVE-2018-8406 before patching?
[Mitigation] Apply the official Microsoft security patches immediately and restrict local access on unpatched systems. Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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