CVE-2026-21733: Imagination Technologies Graphics Vulnerability

CVE-2026-21733 Overview

CVE-2026-21733 is a high-severity vulnerability affecting the Imagination Technologies Graphics DDK (Driver Development Kit) on Linux and Android platforms. This driver vulnerability requires local access and low privileges to exploit, potentially allowing attackers to compromise the confidentiality and integrity of affected systems while also impacting availability.

Critical Impact

Local attackers with low privileges can exploit this vulnerability in Imagination Technologies GPU drivers to achieve high impact on system confidentiality and integrity, potentially leading to unauthorized data access or system manipulation on affected Linux and Android devices.

Affected Products

• Imagination Technologies Graphics DDK on Linux
• Imagination Technologies Graphics DDK on Android
• Devices utilizing Imagination Technologies PowerVR GPU drivers

Discovery Timeline

• April 17, 2026 - CVE-2026-21733 published to NVD
• April 23, 2026 - Last updated in NVD database

Technical Details for CVE-2026-21733

Vulnerability Analysis

This driver vulnerability affects the Imagination Technologies Graphics DDK, which provides GPU driver functionality for PowerVR graphics processors commonly found in mobile devices, embedded systems, and automotive platforms. The vulnerability can be exploited locally by an attacker with low-level privileges without requiring user interaction.

The attack leverages the local attack vector, meaning an attacker would need some form of access to the target system—either physical access, remote shell access, or execution through another vulnerability or malicious application. Once exploited, the vulnerability enables high-impact compromise of both confidentiality and integrity, with additional low-impact effects on system availability.

Given that this vulnerability targets GPU drivers on Android devices, mobile users with affected Imagination Technologies graphics hardware are particularly at risk. Malicious applications could potentially leverage this vulnerability for privilege escalation or sensitive data extraction.

Root Cause

The specific root cause of this vulnerability has not been fully disclosed as the CVE is currently in a reserved state. Based on the vulnerability characteristics affecting GPU drivers, potential root causes may include improper input validation in driver IOCTL handlers, memory management issues within the graphics kernel module, or insufficient privilege checks in driver operations. For complete technical details, refer to the Imagination Technologies Driver Vulnerabilities advisory.

Attack Vector

The vulnerability requires local access to the target system. An attacker would need to execute malicious code on a device running affected Imagination Technologies GPU drivers. On Android platforms, this could be achieved through a malicious application installed on the device. On Linux systems, an attacker would need shell access or the ability to execute arbitrary code.

The exploitation complexity is low, requiring only basic privileges and no user interaction, making this vulnerability particularly concerning for devices that may have untrusted applications or multi-user environments.

Detection Methods for CVE-2026-21733

Indicators of Compromise

• Unusual GPU driver crashes or kernel panics related to Imagination Technologies PowerVR modules
• Unexpected privilege escalation events from low-privileged processes interacting with GPU subsystems
• Anomalous memory access patterns in processes communicating with graphics drivers

Detection Strategies

• Monitor for suspicious IOCTL calls to PowerVR GPU driver device nodes
• Implement kernel integrity monitoring to detect unauthorized modifications to graphics driver modules
• Use application sandboxing and behavioral analysis to identify apps attempting unusual GPU driver interactions

Monitoring Recommendations

• Enable detailed kernel logging for graphics subsystem events on affected Linux systems
• Deploy mobile threat defense solutions to monitor for malicious application behavior on Android devices
• Implement file integrity monitoring on critical GPU driver binaries and kernel modules

How to Mitigate CVE-2026-21733

Immediate Actions Required

• Review and update Imagination Technologies GPU drivers to the latest available version
• On Android devices, ensure system updates from device manufacturers are applied promptly
• Limit installation of applications to trusted sources to reduce attack surface on Android platforms
• Consider restricting access to GPU driver interfaces for non-essential users on Linux systems

Patch Information

Specific patch information for CVE-2026-21733 is available through the official Imagination Technologies security advisory. Consult the Imagination Technologies Driver Vulnerabilities page for the latest driver versions and patch availability. Device manufacturers and OEMs should coordinate with Imagination Technologies for updated driver packages.

Workarounds

• Restrict access to GPU device nodes (/dev/pvr*) to trusted users and processes only on Linux systems
• Implement SELinux or AppArmor policies to limit which processes can interact with GPU drivers
• On Android devices, use mobile security solutions to detect and block potentially malicious applications
• Consider disabling GPU hardware acceleration temporarily in high-security environments until patches are applied

# Linux: Restrict GPU device node access to specific groups
sudo chmod 660 /dev/pvr*
sudo chown root:video /dev/pvr*

# Linux: View current Imagination Technologies driver module status
lsmod | grep pvr

# Android: Check for available system security updates
# Navigate to Settings > Security > Security Update