CVE-2026-22163: Imaginationtech DDK Privilege Escalation

CVE-2026-22163 Overview

CVE-2026-22163 affects the Imagination Technologies DDK (Driver Development Kit) GPU kernel module. The vulnerability resides in the IOCTL interface exposed by the DDK kernel module. Malicious code with local access can misuse this interface in an unsupported way. The misuse allows subversion of the GPU to perform writes to arbitrary physical memory pages. The root cause is a missing synchronization control on a shared resource accessed concurrently, classified as [CWE-820] Missing Synchronization. Successful exploitation provides write access to kernel memory and enables local privilege escalation on affected systems.

Critical Impact

Local attackers with low privileges can leverage the GPU to write to arbitrary physical memory pages, leading to kernel compromise and full system takeover.

Affected Products

• Imagination Technologies DDK 1.17
• Imagination Technologies DDK 1.18, 23.2
• Imagination Technologies DDK 24.1, 24.2

Discovery Timeline

• 2026-03-20 - CVE-2026-22163 published to NVD
• 2026-04-21 - Last updated in NVD database

Technical Details for CVE-2026-22163

Vulnerability Analysis

The DDK kernel module exposes an IOCTL interface used by userspace components to communicate with the GPU driver. The interface accepts requests that configure GPU operations, including memory management primitives. The vulnerability arises when malware-controlled code submits IOCTL requests that exercise the interface outside its supported usage contract. Through these crafted requests, an attacker programs the GPU to issue writes against arbitrary physical memory pages. Because the GPU operates as a Direct Memory Access (DMA) capable peripheral, those writes bypass standard CPU memory protections enforced by the kernel.

Root Cause

The defect is a missing synchronization control on a shared resource accessed concurrently by multiple execution contexts [CWE-820]. The driver utilises the shared resource without serializing access, leaving a window where an attacker can manipulate state used to validate or constrain GPU memory operations. The lack of locking allows the unsupported IOCTL usage pattern to bypass intended boundary checks. As a result, the GPU executes memory operations against physical addresses that the calling process is not authorized to touch.

Attack Vector

Exploitation requires local access and low privileges, but does not require user interaction. The attacker must execute code on the target system, typically through a malicious application or compromised process that can open the DDK device node. The attack complexity is high because triggering the race condition requires precise timing of concurrent IOCTL operations. Successful exploitation results in arbitrary physical memory writes, which an attacker uses to overwrite kernel structures, escalate privileges, or disable security controls. The scope change reflects impact extending beyond the driver to the entire kernel and system integrity.

Detection Methods for CVE-2026-22163

Indicators of Compromise

• Unexpected processes opening the DDK GPU device node with high-frequency IOCTL calls.
• Kernel logs showing GPU page fault anomalies or unusual DMA activity tied to userspace processes.
• Userspace applications issuing IOCTL command codes outside the documented driver API.

Detection Strategies

• Monitor IOCTL call patterns against the DDK device node and flag bursts consistent with race-condition exploitation attempts.
• Correlate GPU driver crashes or kernel oops events with the originating process and parent lineage.
• Apply behavioral analytics to identify unprivileged processes attempting privileged kernel operations following GPU interaction.

Monitoring Recommendations

• Audit access to /dev/dri/* and DDK-specific device nodes, alerting on access by non-graphics processes.
• Collect kernel ring buffer logs and ship them to centralized analytics for anomaly detection.
• Track loaded kernel module versions across the fleet to identify systems running vulnerable DDK builds.

How to Mitigate CVE-2026-22163

Immediate Actions Required

• Inventory systems running Imagination Technologies DDK versions 1.17, 1.18, 23.2, 24.1, and 24.2.
• Apply vendor-supplied driver updates from the Imagination Tech GPU Driver Vulnerabilities advisory as soon as available.
• Restrict access to GPU device nodes so only trusted graphics processes can issue IOCTL requests.

Patch Information

Imagination Technologies publishes fixed driver versions and remediation details in its GPU driver vulnerabilities advisory. Refer to the Imagination Tech GPU Driver Vulnerabilities page for the patched DDK release that addresses the missing synchronization defect in the kernel IOCTL handler. Deploy the patch through the platform vendor or System-on-Chip (SoC) supplier responsible for the integrated GPU stack.

Workarounds

• Limit installation of untrusted third-party applications on systems with vulnerable DDK drivers.
• Tighten device-node permissions so the GPU IOCTL interface is reachable only by privileged graphics services.
• Enforce application allowlisting to prevent execution of unsigned binaries that could invoke the vulnerable interface.

# Restrict access to GPU device nodes to the video group only
sudo chown root:video /dev/dri/renderD*
sudo chmod 0660 /dev/dri/renderD*

# Verify loaded DDK driver version
lsmod | grep -i pvr
dmesg | grep -i "PowerVR\|DDK"