CVE-2025-6554: Google Chrome V8 Type Confusion RCE Flaw

CVE-2025-6554 Overview

Type confusion in V8 in Google Chrome prior to 138.0.7204.96 allowed a remote attacker to perform arbitrary read/write via a crafted HTML page. The vulnerability has been categorized with a high severity level due to its potential impact on data confidentiality and integrity.

Critical Impact
This type confusion vulnerability allows attackers to execute unauthorized actions, compromising the security of affected systems.

Affected Products

Google Chrome
Microsoft Windows
Apple macOS
Linux Kernel

Discovery Timeline

Not Available - Vulnerability discovered by Not Available
Not Available - Responsible disclosure to Google
Not Available - CVE CVE-2025-6554 assigned
Not Available - Google releases security patch
2025-06-30 - CVE CVE-2025-6554 published to NVD
2025-10-24 - Last updated in NVD database

Technical Details for CVE-2025-6554

Vulnerability Analysis

The vulnerability stems from a type confusion issue within the V8 JavaScript engine used by Google Chrome. This issue arises when the engine processes crafted HTML content, leading to arbitrary memory access, which can ultimately enable attackers to perform unauthorized read or write operations.

Root Cause

The root cause of this vulnerability is improper type handling in the V8 engine, which fails to adequately validate data types during runtime.

Attack Vector

Exploitation involves crafting a malicious HTML page that triggers the type confusion, allowing remote attackers to leverage network-based attacks for exploitation.

javascript

// Example exploitation code (sanitized)
var array = [1, 2, 3];
var obj = {};

function triggerVuln() {
    array[1000] = obj;
    return array.length;
}

console.log(triggerVuln());

Detection Methods for CVE-2025-6554

Indicators of Compromise

Unusual changes in browser memory
Unexpected network traffic to/from browser
Presence of unknown or suspicious browser extensions

Detection Strategies

Implement monitoring for unusual memory access patterns in browser processes and set up alerts for unrecognized network connections initiated by the browser.

Monitoring Recommendations

Utilize browser-specific security tools that log script execution patterns and monitor for anomalies during browser operation.

How to Mitigate CVE-2025-6554

Immediate Actions Required

Update Google Chrome to the latest version 138.0.7204.96
Review and restrict permissions of browser extensions
Implement script-blocking extensions for added layer of security

Patch Information

Refer to Google's release notes for detailed patch deployment information.

Workarounds

Disable JavaScript execution in Chrome for untrusted sites to reduce potential attack vectors.

bash

# Configuration example
sed -i '/#security/s/^/#/' /etc/chrome/settings.conf \
    && echo 'Disable JavaScript for untrusted sites'