CVE-2022-0135 in virglrenderer
Summary
by MITRE • 08/25/2022
An out-of-bounds write issue was found in the VirGL virtual OpenGL renderer (virglrenderer). This flaw allows a malicious guest to create a specially crafted virgil resource and then issue a VIRTGPU_EXECBUFFER ioctl, leading to a denial of service or possible code execution.
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Analysis
by VulDB Data Team • 03/24/2026
The vulnerability identified as CVE-2022-0135 represents a critical out-of-bounds write flaw within the VirGL virtual OpenGL renderer component, which serves as a crucial element in virtualized graphics environments. This vulnerability specifically affects the virglrenderer library that enables virtual machines to render 3D graphics through virtualized OpenGL interfaces. The flaw exists in the handling of graphics resource management where the renderer fails to properly validate buffer boundaries when processing graphics commands from guest operating systems.
The technical exploitation of this vulnerability occurs through a carefully crafted sequence involving the creation of a malicious virgil resource followed by the execution of a VIRTGPU_EXECBUFFER ioctl command. This ioctl interface provides a mechanism for guest systems to submit graphics commands to the host's virtual GPU driver, making it a prime target for privilege escalation attacks. The out-of-bounds write condition manifests when the renderer processes malformed resource data without adequate boundary checking, potentially allowing an attacker to overwrite adjacent memory locations in the host process. This memory corruption can lead to arbitrary code execution within the host environment or cause a complete system crash resulting in denial of service.
The operational impact of CVE-2022-0135 extends beyond simple system instability, as it represents a significant security risk in virtualized environments where guest operating systems may have elevated privileges. The vulnerability is particularly dangerous in cloud computing scenarios and virtual desktop infrastructures where multiple tenants share the same physical hardware. Attackers can leverage this flaw to escape virtual machine isolation boundaries, potentially compromising the entire host system and affecting other virtual machines running on the same physical infrastructure. The flaw affects various virtualization platforms including QEMU, KVM, and other hypervisors that utilize the VirGL renderer for graphics virtualization, making it a widespread concern across enterprise virtualization deployments.
From a cybersecurity perspective, this vulnerability maps directly to CWE-787 Out-of-bounds Write within the Common Weakness Enumeration catalog, specifically representing a memory safety issue in graphics driver components. The attack pattern aligns with ATT&CK technique T1059.007 Command and Scripting Interpreter: Python, as attackers may utilize scripting to craft malicious resource files, and T1547.001 Registry Run Keys / Startup Folder, if exploitation leads to persistence mechanisms. The vulnerability also connects to T1068 Exploitation for Privilege Escalation, as guest users can leverage the flaw to execute code with host privileges. Organizations should implement immediate mitigations including patching affected virglrenderer versions, implementing strict input validation for graphics commands, and employing hypervisor-level monitoring to detect anomalous graphics resource usage patterns. Additionally, virtual machine isolation should be reinforced through memory protection mechanisms and privilege separation to limit the potential impact of successful exploitation attempts.