CVE-2022-34670 in GPU Display Driver
Summary
by MITRE • 12/31/2022
NVIDIA GPU Display Driver for Linux contains a vulnerability in the kernel mode layer handler, where an unprivileged regular user can cause truncation errors when casting a primitive to a primitive of smaller size causes data to be lost in the conversion, which may lead to denial of service or information disclosure.
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Analysis
by VulDB Data Team • 06/13/2026
The vulnerability identified as CVE-2022-34670 resides within the NVIDIA GPU Display Driver for Linux operating system kernel mode layer handler, representing a critical security flaw that undermines system integrity and stability. This issue manifests through improper handling of data type conversions within the kernel space, specifically affecting how primitive data types are cast to smaller sizes during kernel operations. The vulnerability falls under the category of data truncation errors, which occur when data is converted from a larger data type to a smaller one, resulting in loss of information during the process. Such flaws are particularly dangerous in kernel mode components where system-level operations occur, as they can be exploited to compromise the entire system's security posture.
The technical exploitation of this vulnerability requires an unprivileged regular user to leverage the kernel mode layer handler functionality to trigger truncation errors through primitive casting operations. When a larger primitive data type is cast to a smaller one, the conversion process results in data loss that can be manipulated to cause unexpected behavior within the kernel. This particular flaw enables attackers to potentially cause system instability through denial of service conditions, where legitimate system operations become unavailable due to the kernel mode handler failing to properly manage the data conversion process. The vulnerability's impact extends beyond simple system disruption as it may also facilitate information disclosure, allowing unauthorized access to sensitive kernel memory areas that should remain protected from regular user processes.
From an operational perspective, this vulnerability represents a significant threat to systems running NVIDIA GPU Display Drivers for Linux, particularly in enterprise environments where multiple users may have access to the system. The fact that an unprivileged user can exploit this flaw means that traditional user access controls and privilege separation mechanisms may be insufficient to prevent exploitation. The vulnerability's potential for causing denial of service makes it particularly concerning for mission-critical systems where availability is paramount, while the information disclosure aspect poses risks to data confidentiality and system integrity. This flaw essentially creates a backdoor through which regular users can potentially access kernel-level resources and manipulate system behavior in ways that should be restricted to privileged kernel processes.
The mitigation strategies for CVE-2022-34670 should focus on immediate patching of the NVIDIA GPU Display Driver components, as this represents the most effective solution to eliminate the vulnerability at its source. System administrators should prioritize updating to the latest NVIDIA driver versions that contain fixes for this specific kernel mode layer handler issue. Additionally, implementing monitoring and logging mechanisms around GPU driver kernel operations can help detect potential exploitation attempts before they cause significant damage. Organizations should also consider implementing additional security controls such as kernel module signing, secure boot configurations, and privilege escalation restrictions to limit the potential impact of such vulnerabilities. The vulnerability aligns with CWE-194 in the Common Weakness Enumeration catalog, which specifically addresses the issue of unintended data truncation during data type conversions, and may be mapped to ATT&CK techniques related to privilege escalation and denial of service within the operating system kernel domain.
This vulnerability demonstrates the critical importance of proper kernel mode programming practices and the need for rigorous code review processes when developing system-level components. The flaw highlights the inherent risks associated with data type conversions in kernel space and underscores the necessity of thorough testing and validation of all kernel operations. Organizations should implement comprehensive security testing procedures that include kernel mode analysis, static code analysis, and dynamic testing of driver components to identify similar vulnerabilities before they can be exploited. The security implications of such kernel-level vulnerabilities extend far beyond simple system stability concerns, as they represent potential entry points for more sophisticated attacks that could compromise entire computing environments and lead to significant data breaches or system compromises.