CVE-2022-31606: Nvidia GPU Display Driver Escalation Flaw

CVE-2022-31606 Overview

CVE-2022-31606 is a vulnerability in the NVIDIA GPU Display Driver for Windows that exists within the kernel mode layer (nvlddmkm.sys) handler for DxgkDdiEscape. The vulnerability stems from a failure to properly validate data, which could allow an attacker with basic user capabilities to cause an out-of-bounds access in kernel mode. Successful exploitation could lead to denial of service, information disclosure, escalation of privileges, or data tampering.

Critical Impact

This vulnerability allows local attackers with low privileges to potentially escalate to kernel-level access, compromise system confidentiality, integrity, and availability through out-of-bounds memory access in the NVIDIA display driver.

Affected Products

• NVIDIA GPU Display Driver for Windows
• NVIDIA GeForce
• NVIDIA Virtual GPU
• NVIDIA Cloud Gaming Guest
• NVIDIA Studio
• NVIDIA Tesla

Discovery Timeline

• 2022-11-19 - CVE-2022-31606 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-31606

Vulnerability Analysis

This vulnerability is classified as CWE-787 (Out-of-Bounds Write), a memory corruption flaw that occurs when the software writes data past the end or before the beginning of an intended buffer. In the context of CVE-2022-31606, the NVIDIA kernel mode driver fails to properly validate input data passed through the DxgkDdiEscape interface, which is used for private communication between the user-mode display driver and the display miniport driver.

The DxgkDdiEscape function is a standard Windows Display Driver Model (WDDM) callback that allows proprietary commands to pass between components. When input validation is insufficient, attackers can craft malicious escape codes that cause the kernel driver to write beyond allocated buffer boundaries, potentially corrupting kernel memory structures.

Root Cause

The root cause of this vulnerability lies in improper input validation within the nvlddmkm.sys kernel mode layer. The driver's escape handler does not adequately verify the size and boundaries of user-supplied data before processing it, leading to out-of-bounds memory access conditions. This is a common vulnerability pattern in kernel drivers where trust boundaries between user-mode and kernel-mode code are not properly enforced.

Attack Vector

Exploitation of CVE-2022-31606 requires local access to the target system. An attacker would need basic user capabilities to interact with the NVIDIA display driver through the DxgkDdiEscape interface. The attack flow typically involves:

1. The attacker executes a malicious application on the local system
2. The application opens a handle to the NVIDIA display driver
3. Crafted DeviceIoControl calls are made targeting the DxgkDdiEscape handler
4. The malformed input bypasses validation and triggers out-of-bounds memory access
5. Depending on the specific memory corruption achieved, the attacker may cause a denial of service (BSOD), leak sensitive kernel memory, or achieve privilege escalation

The vulnerability requires no user interaction beyond running the malicious code, and the attack complexity is low since the escape interface is readily accessible to standard user accounts. For detailed technical information, refer to the NVIDIA Security Bulletin.

Detection Methods for CVE-2022-31606

Indicators of Compromise

• Unexpected system crashes (Blue Screen of Death) with references to nvlddmkm.sys
• Unusual process activity interacting with NVIDIA driver escape interfaces
• Signs of privilege escalation from low-privileged user accounts
• Memory corruption artifacts in kernel crash dumps

Detection Strategies

• Monitor for suspicious DeviceIoControl calls targeting NVIDIA display driver interfaces
• Implement kernel crash analysis to identify exploitation attempts through crash dump analysis
• Deploy endpoint detection solutions capable of monitoring kernel driver interactions
• Enable Windows Driver Verifier for enhanced driver monitoring in test environments

Monitoring Recommendations

• Configure SIEM alerts for recurring nvlddmkm.sys-related system crashes
• Monitor for unusual patterns of user-mode to kernel-mode communication via graphics drivers
• Implement file integrity monitoring on NVIDIA driver files to detect unauthorized modifications
• Review system event logs for driver-related errors and unexpected privilege changes

How to Mitigate CVE-2022-31606

Immediate Actions Required

• Update NVIDIA GPU Display Drivers to the latest patched versions immediately
• Audit systems to identify all instances of affected NVIDIA driver versions
• Prioritize patching on systems with untrusted local users or shared environments
• Consider restricting access to systems with vulnerable drivers until patches are applied

Patch Information

NVIDIA has released security updates to address this vulnerability. Affected users should download and install the latest driver versions from the official NVIDIA website or through NVIDIA GeForce Experience. For enterprise deployments using NVIDIA Virtual GPU or Cloud Gaming solutions, consult the NVIDIA Security Bulletin for specific version requirements and update procedures.

Workarounds

• Restrict local access to systems with vulnerable NVIDIA drivers to trusted users only
• Implement application whitelisting to prevent unauthorized executables from running
• Consider temporarily disabling non-essential NVIDIA features if patching cannot be immediately performed
• Deploy network segmentation to limit lateral movement if exploitation occurs

# Verify installed NVIDIA driver version on Windows
nvidia-smi --query-gpu=driver_version --format=csv,noheader

# Check for nvlddmkm.sys driver details via PowerShell
Get-WmiObject Win32_PnPSignedDriver | Where-Object {$_.DeviceName -like "*NVIDIA*"} | Select-Object DeviceName, DriverVersion