CVE-2021-1086
📋 TL;DR
This vulnerability in NVIDIA vGPU driver allows guest virtual machines to access unauthorized resources on the host system, potentially leading to data theft, integrity compromise, or information disclosure. It affects organizations using NVIDIA vGPU technology for virtualization. The vulnerability impacts vGPU versions 12.x (prior to 12.2), 11.x (prior to 11.4), and 8.x (prior to 8.7).
💻 Affected Systems
- NVIDIA Virtual GPU Manager (vGPU plugin)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Guest VM gains full control over host resources, leading to complete compromise of the virtualization environment, data exfiltration, and lateral movement to other systems.
Likely Case
Guest VM accesses unauthorized host resources, potentially exposing sensitive data or configuration information from other VMs or the host system.
If Mitigated
Limited impact with proper network segmentation, minimal guest privileges, and monitoring in place.
🎯 Exploit Status
Exploitation requires guest VM access and knowledge of vGPU internals. No public exploit code has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: vGPU 12.2, 11.4, 8.7 or later
Vendor Advisory: https://nvidia.custhelp.com/app/answers/detail/a_id/5172
Restart Required: Yes
Instructions:
1. Download updated vGPU driver from NVIDIA portal. 2. Install on all affected hypervisor hosts. 3. Reboot hypervisor hosts. 4. Verify guest VMs are using updated vGPU drivers.
🔧 Temporary Workarounds
Isolate vGPU Environments
allSegment vGPU-enabled VMs from critical infrastructure and implement strict network controls.
Minimize Guest Privileges
allApply principle of least privilege to guest VMs and restrict unnecessary capabilities.
🧯 If You Can't Patch
- Isolate affected vGPU environments from production networks and critical systems
- Implement strict monitoring and alerting for unusual guest VM behavior or resource access patterns
🔍 How to Verify
Check if Vulnerable:
Check vGPU driver version on hypervisor hosts: 'cat /proc/driver/nvidia/version' or 'nvidia-smi' on Linux hostsCheck Version:
nvidia-smi --query-gpu=driver_version --format=csv,noheaderVerify Fix Applied:
Verify vGPU driver version is 12.2+, 11.4+, or 8.7+ and check NVIDIA advisory for specific patch validation steps📡 Detection & Monitoring
Log Indicators:
- Unusual guest VM resource access patterns
- Failed vGPU driver operations
- Unexpected guest VM privilege escalation attempts
Network Indicators:
- Unusual network traffic from vGPU-enabled VMs to sensitive systems
- Guest VM attempting to access hypervisor management interfaces
SIEM Query:
source="vGPU_logs" AND (event_type="unauthorized_access" OR resource="vGPU_control")