CVE-2021-1122 in vGPU Software
Summary
by MITRE • 10/30/2021
NVIDIA vGPU software contains a vulnerability in the Virtual GPU Manager (vGPU plugin), where it can dereference a NULL pointer, which may lead to denial of service.
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Analysis
by VulDB Data Team • 11/04/2021
The vulnerability identified as CVE-2021-1122 resides within NVIDIA vGPU software's Virtual GPU Manager component, specifically within the vGPU plugin module. This flaw represents a critical NULL pointer dereference issue that fundamentally compromises the stability and reliability of virtualized GPU environments. The vulnerability manifests when the vGPU plugin attempts to access memory through a pointer that has not been properly initialized or validated, creating a scenario where the system encounters a null reference during execution. Such conditions typically arise in scenarios involving improper error handling or insufficient input validation within the plugin's operational lifecycle.
From a technical perspective, the NULL pointer dereference vulnerability operates at the core of memory management within the vGPU software stack. When the Virtual GPU Manager processes certain input parameters or system states, it fails to adequately validate whether pointers contain valid memory addresses before attempting to dereference them. This failure creates a path where execution can proceed to an invalid memory location, resulting in an immediate system crash or termination of the vGPU plugin service. The vulnerability's impact is particularly severe in virtualized environments where multiple virtual machines depend on the stability of the underlying GPU virtualization layer, as a single point of failure can cascade across numerous virtualized workloads.
The operational impact of CVE-2021-1122 extends beyond simple service disruption to encompass broader system availability and reliability concerns within enterprise GPU virtualization deployments. Organizations utilizing NVIDIA vGPU solutions for data center virtualization, cloud computing platforms, or high-performance computing environments face significant risk when this vulnerability remains unaddressed. The denial of service condition can occur during normal operation or under specific workload conditions, making it particularly challenging to predict and mitigate. This vulnerability directly affects the ATT&CK technique T1499.004, which involves network denial of service attacks, as the compromised vGPU plugin can render virtual GPU resources unavailable to dependent applications and services.
Security implications of this vulnerability align with CWE-476, which specifically addresses NULL pointer dereference conditions in software implementations. The vulnerability demonstrates a classic software flaw where proper validation mechanisms have been omitted or bypassed during the development of the vGPU plugin. Organizations deploying NVIDIA vGPU solutions must consider the broader security posture implications, as this vulnerability could potentially serve as an entry point for more sophisticated attacks if combined with other exploitation techniques. The ATT&CK framework categorizes such vulnerabilities under T1562.001, which covers "Impairing Defenses" through the introduction of service disruptions that can mask more serious underlying security issues.
Mitigation strategies for CVE-2021-1122 should prioritize immediate patch deployment from NVIDIA, as the vendor has released updates specifically addressing this NULL pointer dereference vulnerability. System administrators should implement comprehensive monitoring of vGPU plugin processes to detect anomalous behavior that might indicate exploitation attempts. Additionally, organizations should consider implementing network segmentation and access controls around vGPU management interfaces to limit potential attack surfaces. The vulnerability's nature suggests that preventive measures should include robust input validation and error handling routines within the vGPU plugin architecture, aligning with industry best practices for secure software development methodologies. Regular security assessments of virtualization environments and continuous monitoring of NVIDIA security advisories remain essential for maintaining system integrity and preventing exploitation of similar vulnerabilities.