CVE-2026-45203: GPU DDK - rgxfw_hwperf_ufo() re-reads psCmdHeader->ui32CmdSize after initial check, TOCTOU

Published Jul 10, 2026
·
Updated

Kernel software installed and running inside a Host VM may post improper commands to the GPU Firmware to trigger a memory write outside the permitted range of memory for the host kernel.

A TOCTOU bug existed where a malicious driver could modify values in memory after firmware validation but before use.

Affected Software

5 affected components
GPU DDK rgxfw_hwperf_ufo()
All of the following
Any of the following
Imaginationtech Ddk<26.1
Imaginationtech Ddk=26.1-rtm1
Any of the following
Google Android
Linux Linux kernel

Event History

Jul 10, 2026
CVE Published
via MITRE·08:57 PM
Data Sourced
via MITRE·08:57 PM
DescriptionWeakness
Data Sourced
via NVD·09:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-45203?

CVE-2026-45203 has a high severity score of 7.8 based on the CVSS 3.1 metrics.

2

What risks are associated with CVE-2026-45203?

CVE-2026-45203 poses a risk of improper commands being sent to the GPU Firmware, potentially leading to unauthorized memory writes.

3

How do I fix CVE-2026-45203?

Mitigation for CVE-2026-45203 involves updating the GPU DDK to the latest version that addresses this TOCTOU vulnerability.

4

What component is affected by CVE-2026-45203?

CVE-2026-45203 affects the GPU DDK specifically within the rgxfw_hwperf_ufo() function.

5

Can a malicious driver exploit CVE-2026-45203?

Yes, a malicious driver can exploit CVE-2026-45203 by modifying memory values after firmware validation.

Company

Resources

Contact

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CVE-2026-45203 - GPU DDK - rgxfw_hwperf_ufo() re-reads psCmdHeader->ui32CmdSize after initial check, TOCTOU - SecAlerts