CVE-2025-33220 Overview
CVE-2025-33220 is a use-after-free vulnerability [CWE-416] in the NVIDIA vGPU software Virtual GPU Manager. A malicious guest virtual machine can trigger heap memory access after the memory has been freed on the host. Successful exploitation may lead to code execution, privilege escalation, data tampering, denial of service, or information disclosure.
The flaw allows a low-privileged attacker inside a guest VM to compromise host-level integrity across the virtualization boundary. This affects multi-tenant environments where NVIDIA vGPU is used to share physical GPU resources between guests.
Critical Impact
A malicious guest VM can achieve code execution or privilege escalation on the vGPU host, breaking guest isolation in shared GPU environments.
Affected Products
- NVIDIA vGPU software - Virtual GPU Manager
- NVIDIA vGPU-enabled hypervisor deployments
- Multi-tenant virtualization environments running affected vGPU versions
Discovery Timeline
- 2026-01-28 - CVE-2025-33220 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-33220
Vulnerability Analysis
The vulnerability is a use-after-free condition [CWE-416] in the NVIDIA Virtual GPU Manager component. Use-after-free defects occur when a program continues to reference heap memory after that memory has been released. Attackers can influence the contents of the freed region and use the dangling pointer to hijack control flow or corrupt kernel-level state.
Because the Virtual GPU Manager runs at the host level and mediates guest access to physical GPU hardware, a successful exploit crosses the guest-host trust boundary. According to NVIDIA, exploitation may result in code execution, escalation of privileges, data tampering, denial of service, or information disclosure.
The vulnerability requires local access with low privileges and no user interaction. Multi-tenant deployments face the highest risk because any guest workload can potentially attack the shared host.
Root Cause
The root cause is improper lifecycle management of heap-allocated objects within the Virtual GPU Manager. A code path frees an allocation but retains or reuses a pointer that references the freed memory. Subsequent access to that pointer permits reading or writing memory that may have been reallocated for a different purpose.
Attack Vector
An attacker must have local, low-privileged access inside a guest virtual machine. The attacker issues crafted requests through the guest driver interface to the Virtual GPU Manager to trigger the vulnerable free-and-reuse sequence. No user interaction is required on the host. Refer to the NVIDIA Support Article for vendor-specific technical details.
Detection Methods for CVE-2025-33220
Indicators of Compromise
- Unexpected crashes, hangs, or restarts of the Virtual GPU Manager service on the hypervisor host
- Kernel panics or GPU driver faults correlated with guest VM activity
- Anomalous guest-to-host communication patterns through the vGPU control interface
Detection Strategies
- Monitor hypervisor host logs for repeated NVIDIA vGPU service faults or driver-level exceptions
- Correlate guest VM GPU workload spikes with host-side memory or crash events
- Baseline expected vGPU driver behavior and alert on deviations that suggest exploitation attempts
Monitoring Recommendations
- Collect hypervisor kernel logs, NVIDIA driver logs, and vGPU Manager service telemetry into a centralized SIEM
- Track NVIDIA security advisories and inventory hosts running affected vGPU versions
- Enable crash-dump collection on hypervisor hosts to support forensic analysis of driver faults
How to Mitigate CVE-2025-33220
Immediate Actions Required
- Identify all hypervisor hosts running NVIDIA vGPU software and confirm installed versions against the vendor advisory
- Apply the patched Virtual GPU Manager release from NVIDIA as soon as it is available for your deployment
- Restrict guest VM tenancy on affected hosts to trusted workloads until patching is complete
Patch Information
NVIDIA has published remediation guidance in the NVIDIA Support Article. Administrators should consult the advisory for the list of fixed vGPU software versions and follow vendor-supplied upgrade procedures for the Virtual GPU Manager on hypervisor hosts. Additional metadata is available at the NIST CVE-2025-33220 Record and the CVE.org CVE-2025-33220 Record.
Workarounds
- Isolate untrusted guests from hosts running vulnerable vGPU Manager versions
- Reduce guest privileges and restrict access to GPU-passthrough features where feasible
- Increase monitoring of vGPU host stability and driver faults until patches are deployed
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
