CVE-2026-9898

Description

Insufficient validation of untrusted input in GPU in Google Chrome on Android prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

8.3

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

Google Chrome for Android < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- Proof of Concept for CVE-2026-9898 -->
<!-- This PoC demonstrates the trigger condition for the GPU validation issue -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-9898 PoC</title>
</head>
<body>
    <h3>Chrome GPU Sandbox Escape PoC</h3>
    <canvas id="glcanvas" width="640" height="480"></canvas>
    <script>
        // Attempt to trigger the GPU vulnerability via WebGL
        const canvas = document.getElementById('glcanvas');
        const gl = canvas.getContext('webgl');

        if (gl) {
            console.log("[+] WebGL context initialized.");
            
            // Crafted shader or buffer data to exploit insufficient validation
            const vertexShaderSource = `
                attribute vec4 aVertexPosition;
                void main() {
                    gl_Position = aVertexPosition;
                }
            `;
            
            const fragmentShaderSource = `
                void main() {
                    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
                }
            `;

            function loadShader(gl, type, source) {
                const shader = gl.createShader(type);
                gl.shaderSource(shader, source);
                gl.compileShader(shader);
                if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
                    console.error('An error occurred compiling the shaders: ' + gl.getShaderInfoLog(shader));
                    gl.deleteShader(shader);
                    return null;
                }
                return shader;
            }

            const shaderProgram = gl.createProgram();
            const vertexShader = loadShader(gl, gl.VERTEX_SHADER, vertexShaderSource);
            const fragmentShader = loadShader(gl, gl.FRAGMENT_SHADER, fragmentShaderSource);

            gl.attachShader(shaderProgram, vertexShader);
            gl.attachShader(shaderProgram, fragmentShader);
            gl.linkProgram(shaderProgram);

            if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
                console.error('Unable to initialize the shader program: ' + gl.getProgramInfoLog(shaderProgram));
                return;
            }

            gl.useProgram(shaderProgram);
            
            // Sending untrusted input to GPU to trigger the vulnerability
            const positionBuffer = gl.createBuffer();
            gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
            // Malicious buffer data
            const positions = [ 
                 1.0,  1.0, 
                -1.0,  1.0, 
                 1.0, -1.0, 
                -1.0, -1.0, 
            ];
            
            // In a real exploit, this data would be specifically crafted to corrupt memory
            gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW);
            
            const vertexPosition = gl.getAttribLocation(shaderProgram, 'aVertexPosition');
            gl.vertexAttribPointer(vertexPosition, 2, gl.FLOAT, false, 0, 0);
            gl.enableVertexAttribArray(vertexPosition);

            gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
            console.log("[+] Draw command executed. Check GPU process for crash or escape.");
        } else {
            console.log("[-] WebGL is not supported.");
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9898
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9898
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9898/
[4] VulDB https://vuldb.com/cve/CVE-2026-9898
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/496282591

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9898", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:47.803", "lastModified": "2026-05-29T16:16:36.220", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient validation of untrusted input in GPU in Google Chrome on Android prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/496282591", "source": "[email protected]"}]}}