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How CVE-2026-18015 Works
CVE-2026-18015 is a vulnerability in Google Chrome’s Tint component, which is a shader language compiler used by the browser’s graphics pipeline. Tint is responsible for translating high-level shading languages (like WGSL) into platform-specific GPU code, enabling WebGPU and other graphics-intensive web applications to run efficiently inside the browser.
The flaw is classified as an inappropriate implementation — a logical error in how Tint handles certain shader constructs or memory operations. On macOS, due to platform-specific differences in how GPU memory and process isolation are managed, this implementation bug becomes exploitable. When a remote attacker crafts a malicious HTML page containing specially designed shader code, Tint processes this code in an unexpected way, leading to memory corruption or the bypass of critical security checks.
The vulnerability is triggered during the compilation or execution of the shader within the renderer process — the sandboxed process that handles web content. Under normal circumstances, the renderer process is heavily restricted by Chrome’s sandbox, which limits its ability to interact with the operating system or other processes. However, CVE-2026-18015 allows the attacker to break out of this sandbox. By leveraging the inappropriate implementation in Tint, the attacker can escalate privileges from the renderer process to the parent process or the underlying system, effectively achieving sandbox escape.
Once the sandbox is bypassed, the attacker gains the ability to execute arbitrary code on the host system with the privileges of the Chrome browser process. This could lead to full system compromise, data theft, or further lateral movement within the network. The attack requires user interaction — the victim must visit a malicious website or click a crafted link — but no additional privileges are needed, making it a potent vector for drive-by attacks.
Although Chromium assigned a Low severity rating to this vulnerability, the CVSS score provided by CISA-ADP is 9.6 (Critical), reflecting the severe impact of a sandbox escape: high confidentiality, integrity, and availability impacts with a changed scope. The discrepancy arises because Chromium’s internal severity often considers exploit complexity and mitigations, while CVSS focuses on the theoretical worst-case impact.
The vulnerability affects Google Chrome on Mac versions prior to 151.0.7922.72. Microsoft Edge (Chromium-based) is also affected until it ingests the fix. No public exploits have been confirmed at the time of writing, but the technical nature of the bug makes it a prime target for advanced threat actors.
DailyCVE Form:
Platform: Google Chrome Mac
Version: < 151.0.7922.72
Vulnerability: Tint inappropriate implementation
Severity: Low (Chromium) / Critical
date: 2026-07-29
Prediction: Patch available 2026-07-29
What Undercode Say: Analytics
Check installed Chrome version on Mac /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version Expected output if vulnerable: Google Chrome 151.0.7922.71 (or lower) Check for available updates via CLI (macOS) defaults read /Applications/Google\ Chrome.app/Contents/Info.plist CFBundleShortVersionString Query NVD for CVE details using cve-search (if installed) cve-search -c CVE-2026-18015 Monitor for exploitation attempts in web logs (grep for suspicious shader payloads) grep -E "wgsl|webgpu|gpu" /var/log/apache2/access.log Sniff for sandbox escape indicators via sysdig (example) sysdig -p "%proc.name %fd.name" "evt.type=execve and proc.name=chrome" Pull Chromium security release notes for the fixed version curl -s https://chromereleases.googleblog.com/ | grep -A 5 "151.0.7922.72"
Exploit Scenario (Conceptual):
- Attacker hosts a malicious HTML page containing a WebGPU shader that exploits the Tint implementation bug.
- Victim visits the page using a vulnerable Chrome version on macOS.
- The renderer process compiles the shader, triggering memory corruption.
- Attacker leverages the corruption to overwrite a function pointer or bypass sandbox restrictions.
- A payload is executed in the context of the browser process, achieving code execution outside the sandbox.
// Simplified PoC-style snippet (not functional, for illustration) const code = <code>@group(0) @binding(0) var<storage, read_write> data: array<u32>; @compute @workgroup_size(1) fn main(@builtin(global_invocation_id) id: vec3<u32>) { // Exploit trigger: out-of-bounds or type confusion data[id.x] = data[id.x + 0x1000]; // causes Tint miscompilation }</code>; const shader = device.createShaderModule({ code }); // ... rest of WebGPU setup
Protection from CVE-2026-18015:
- Immediate Update: Upgrade Google Chrome to version 151.0.7922.72 or later. This is the only complete mitigation.
- Enterprise Policies: Use Chrome’s `UpdatePolicyOverride` to force automatic updates on managed devices.
- Network Defense: Deploy web filtering to block known malicious domains hosting exploit pages.
- Sandbox Hardening: On macOS, ensure System Integrity Protection (SIP) is enabled and consider additional endpoint detection rules for abnormal Chrome child process creation.
- User Awareness: Educate users to avoid clicking untrusted links or visiting suspicious websites.
- Temporary Workaround: Disable WebGPU support via Chrome flags (
--disable-webgpu) if patching is delayed, though this may break legitimate web applications.
Impact:
- Confidentiality: Full read access to user files, browser data, cookies, and passwords.
- Integrity: Ability to modify system files, install malware, or alter browser behavior.
- Availability: System crashes, denial of service, or persistent backdoor installation.
- Scope: The sandbox escape breaks Chrome’s security boundary, affecting the entire operating system.
- Exploitability: Remotely exploitable with low complexity; requires only user interaction (visiting a webpage).
- Patch Gap: Systems not updated within the first 72 hours post-disclosure are at elevated risk, especially in targeted attacks.
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Sources:
Reported By: nvd.nist.gov
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