CVE-2021-1098
📋 TL;DR
NVIDIA vGPU software has a resource management vulnerability where the Virtual GPU Manager fails to properly release resources during guest driver unload. This allows malicious guests to reuse those resources, potentially leading to information disclosure, data tampering, or denial of service. Affects organizations using NVIDIA vGPU virtualization technology with vulnerable versions.
💻 Affected Systems
- NVIDIA Virtual GPU Manager (vGPU plugin)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Malicious guest could gain unauthorized access to host system resources, potentially leading to full host compromise, data exfiltration, or persistent denial of service across multiple virtual machines.
Likely Case
Guest-to-host privilege escalation allowing information disclosure about other VMs or host resources, or denial of service affecting vGPU availability.
If Mitigated
Limited impact with proper network segmentation, guest isolation, and monitoring; potential for resource exhaustion but contained within virtual environment.
🎯 Exploit Status
Exploitation requires guest VM access and knowledge of vGPU driver operations. No public exploits known as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: vGPU version 12.3, 11.5, or 8.8
Vendor Advisory: https://nvidia.custhelp.com/app/answers/detail/a_id/5211
Restart Required: Yes
Instructions:
1. Download appropriate vGPU update from NVIDIA portal. 2. Apply update to virtualization host. 3. Restart host system. 4. Update guest VM drivers if required.
🔧 Temporary Workarounds
Isolate Guest VMs
allImplement strict network segmentation and resource isolation between guest VMs to limit lateral movement.
Monitor vGPU Resource Usage
linuxImplement monitoring for abnormal vGPU resource allocation patterns and driver unload events.
🧯 If You Can't Patch
- Implement strict access controls to guest VMs and monitor for suspicious activity
- Consider migrating critical workloads to non-vulnerable systems or alternative virtualization solutions
🔍 How to Verify
Check if Vulnerable:
Check vGPU version on host: nvidia-smi -q | grep 'Driver Version' and compare to vulnerable rangesCheck Version:
nvidia-smi -q | grep 'Driver Version'Verify Fix Applied:
Verify vGPU version is 12.3, 11.5, 8.8 or later: nvidia-smi -q | grep 'Driver Version'📡 Detection & Monitoring
Log Indicators:
- Multiple vGPU driver unload events from same guest
- Abnormal vGPU resource allocation patterns
- Guest VM attempting privileged vGPU operations
Network Indicators:
- Unusual guest-to-host communication patterns
- Guest VMs accessing vGPU management interfaces
SIEM Query:
source="nvidia-vgpu" AND (event="driver_unload" OR event="resource_allocation") | stats count by guest_vm