CVE-2026-22166: WebGPU Use-After-Free Vulnerability

CVE-2026-22166 Overview

CVE-2026-22166 is a use-after-free vulnerability [CWE-416] in the Imagination Technologies GPU GLES user-space shared library. A web page containing crafted WebGPU content loaded into the GPU GLES render process triggers a write use-after-free crash. On platforms where the graphics workload process runs with system privileges, attackers can chain this flaw into broader system compromise.

The issue affects integrity and availability of the rendering pipeline and creates a primitive that supports follow-on exploitation. Imagination Technologies published an advisory describing the driver-level defect.

Critical Impact

Remote attackers can deliver malicious WebGPU shader content via a web page to corrupt memory in the GPU GLES render process, potentially leading to privileged code execution on affected platforms.

Affected Products

• Imagination Technologies GPU GLES user-space shared library
• Devices using PowerVR GPU drivers exposing WebGPU through GLES
• Platforms where the graphics workload process executes with system privileges

Discovery Timeline

• 2026-05-01 - CVE-2026-22166 published to NVD
• 2026-05-06 - Last updated in NVD database

Technical Details for CVE-2026-22166

Vulnerability Analysis

The vulnerability resides in the GPU GLES user-space shared library that processes WebGPU workloads. WebGPU is a browser API that compiles shader code and dispatches compute and rendering commands to the underlying GPU stack. When the renderer receives unusual WebGPU content, the driver mishandles object lifetime tracking and writes to memory that has already been freed.

This use-after-free condition produces a memory corruption primitive inside the GLES render process. Attackers control the freed allocation through crafted draw or compute commands, then trigger the dangling write to overwrite adjacent state. Because rendering occurs after browser sandbox handoff, exploitation primitives reach driver-managed memory regions.

On platforms where the graphics workload process holds system privileges, successful corruption escalates impact beyond the browser sandbox. The advisory from Imagination Technologies confirms the flaw originates in driver code and not in the browser layer.

Root Cause

The root cause is improper object lifetime management within the GPU GLES shared library when handling malformed WebGPU resource bindings. The library writes to a buffer or descriptor after the underlying allocation has been released, satisfying the conditions for [CWE-416].

Attack Vector

Attack delivery is network-based. A victim visits a web page containing malicious WebGPU shader and resource setup code. The browser passes the content to the GLES render process, where the driver processes the unusual sequence and triggers the write use-after-free. Low privileges are required because the user only needs an active browser session with WebGPU enabled.

No public proof-of-concept code is available. Refer to the Imagination Technologies Driver Vulnerabilities advisory for vendor-supplied technical details.

Detection Methods for CVE-2026-22166

Indicators of Compromise

• Repeated crashes or restart events in the GPU GLES render process tied to specific browser tabs or origins
• Unexpected child processes spawned by the GPU process after WebGPU page loads
• Anomalous memory access violations logged by the kernel graphics subsystem

Detection Strategies

• Monitor browser telemetry and crash dumps for repeated faults in the GPU GLES user-space library after WebGPU API calls
• Inspect web traffic for pages that load WebGPU shaders from low-reputation domains and correlate with renderer crashes
• Apply behavioral identification to flag privileged GPU processes performing post-corruption activities such as file writes or network connections

Monitoring Recommendations

• Enable detailed logging on the graphics driver and centralize crash artifacts for review
• Track WebGPU feature flag usage across managed browsers and alert on unexpected enablement
• Correlate GPU process crashes with browsing history to identify candidate exploitation pages

How to Mitigate CVE-2026-22166

Immediate Actions Required

• Apply firmware and driver updates from Imagination Technologies and downstream OEMs as soon as they are available
• Disable WebGPU in managed browsers on affected platforms until patches are deployed
• Restrict the privileges of the GPU graphics workload process where platform configuration permits

Patch Information

Imagination Technologies tracks driver-level fixes through the GPU Driver Vulnerabilities portal. Apply the corresponding GPU GLES user-space library update once the device vendor publishes it. Confirm the installed driver version after patching to validate remediation.

Workarounds

• Disable the WebGPU feature flag in Chromium-based browsers (chrome://flags/#enable-unsafe-webgpu) and equivalent settings in other browsers
• Block access to untrusted sites that request WebGPU contexts using web filtering policies
• Run browsers with reduced GPU process privileges where the operating system supports privilege separation

# Configuration example: disable WebGPU via enterprise policy (Chrome)
# Set the following policy on managed endpoints
HKLM\SOFTWARE\Policies\Google\Chrome\BrowserSwitcherEnabled = 0
# Or via JSON policy on Linux/macOS:
{
  "EnableExperimentalWebPlatformFeatures": false,
  "URLBlocklist": ["webgpu://*"]
}