CVE-2026-34193 Overview
CVE-2026-34193 is a GPU firmware vulnerability affecting Imagination Technologies GPU drivers. Kernel software running inside a Guest or Host virtual machine can post improper commands to the GPU firmware. These commands trigger writes outside the intended GPU memory region.
The flaw stems from a logic error in address translation. A compromised host kernel can perform arbitrary writes to firmware memory through this defect. The vulnerability is classified under [CWE-823] Use of Out-of-range Pointer Offset.
Critical Impact
A compromised host kernel can issue crafted GPU commands that bypass memory bounds, writing arbitrary data into GPU firmware memory and undermining the integrity of the firmware execution environment.
Affected Products
- Imagination Technologies GPU drivers (see vendor advisory for affected versions)
- Systems running Guest/Host VMs with Imagination GPU passthrough or virtualization
- Kernel-level GPU command submission interfaces exposed to virtual machines
Discovery Timeline
- 2026-06-01 - CVE-2026-34193 published to NVD
- 2026-06-01 - Last updated in NVD database
Technical Details for CVE-2026-34193
Vulnerability Analysis
The vulnerability resides in the GPU firmware command processing path. Kernel software within a Guest or Host VM submits commands to the GPU firmware over the command interface. A defect in how the firmware translates supplied addresses allows commands to reference memory locations outside the intended GPU memory range.
When the firmware executes a write driven by these crafted commands, the write lands in unintended memory regions, including firmware memory itself. This breaks the isolation boundary the firmware is expected to maintain against kernel-mode callers. The result is corruption of firmware state from a privileged kernel context.
The issue is categorized as use of an out-of-range pointer offset [CWE-823]. The attack vector is adjacent network according to the CVSS metrics, reflecting the local privileged kernel context required to reach the GPU command interface.
Root Cause
The root cause is a logic error in the firmware's address translation routine. The translation step does not correctly validate or constrain the resulting address against the bounds of legitimate GPU memory. A compromised host kernel can exploit this gap to direct firmware writes to arbitrary firmware memory locations.
Attack Vector
An attacker must first achieve kernel-level execution inside a Guest or Host VM that has access to the GPU command submission path. From that position, the attacker constructs GPU commands containing address fields engineered to bypass the translation logic. The firmware processes these commands and writes attacker-controlled data into firmware memory, enabling integrity violations within the GPU firmware environment.
No verified public exploit code is available. Refer to the Imagination Technologies GPU Driver Vulnerabilities advisory for technical details from the vendor.
Detection Methods for CVE-2026-34193
Indicators of Compromise
- Unexpected GPU firmware crashes, resets, or watchdog timeouts on systems running Imagination GPUs
- Anomalous GPU command submission patterns originating from Guest or Host VM kernel drivers
- Kernel logs showing irregular GPU memory mapping or address translation faults
Detection Strategies
- Monitor kernel module loads and modifications to GPU driver components in Guest and Host VMs
- Inspect GPU driver telemetry for malformed command buffers or out-of-range address fields
- Correlate GPU firmware errors with privileged process activity inside virtual machines
Monitoring Recommendations
- Enable verbose logging for the GPU driver and firmware command path where supported by the vendor
- Track integrity of the GPU firmware image across reboots and reloads
- Alert on unauthorized kernel privilege escalation events on hosts with GPU passthrough enabled
How to Mitigate CVE-2026-34193
Immediate Actions Required
- Apply the firmware and driver updates published by Imagination Technologies as soon as they are available for your platform
- Restrict GPU passthrough and direct GPU command submission to trusted, hardened VMs only
- Harden the host and guest kernels to reduce the likelihood of an attacker reaching kernel privileges
Patch Information
Imagination Technologies publishes GPU driver and firmware fixes through its security advisory page. Consult the Imagination Technologies GPU Driver Vulnerabilities advisory for the specific driver and firmware versions that remediate CVE-2026-34193. Downstream platform vendors integrating Imagination GPU IP must rebuild and ship updated firmware and driver packages to affected devices.
Workarounds
- Disable GPU passthrough to untrusted virtual machines until patched firmware is deployed
- Limit which kernel components can submit commands to the GPU firmware through driver configuration and access controls
- Apply defense-in-depth controls that reduce the attack surface for kernel compromise, including signed kernel modules and reduced privileged service exposure
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
