CVE-2026-2321: Google Chrome Ozone Use After Free Flaw

CVE-2026-2321 Overview

CVE-2026-2321 is a Use After Free vulnerability in the Ozone component of Google Chrome prior to version 145.0.7632.45. This memory corruption flaw allows a remote attacker who convinces a user to engage in specific UI gestures to potentially exploit heap corruption via a crafted HTML page. Chromium has classified this vulnerability as Medium severity.

Critical Impact

Successful exploitation could allow attackers to achieve arbitrary code execution or cause application crashes through heap corruption, potentially compromising user systems when visiting malicious websites.

Affected Products

• Google Chrome versions prior to 145.0.7632.45
• Chromium-based browsers using affected Ozone component versions
• Linux distributions using Ozone display backend for Chrome

Discovery Timeline

• 2026-02-11 - CVE-2026-2321 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2026-2321

Vulnerability Analysis

This Use After Free (CWE-416) vulnerability resides in the Ozone component of Google Chrome. Ozone is Chrome's abstraction layer for windowing systems, primarily used on Linux-based platforms to interface with display servers such as Wayland and X11. The vulnerability occurs when a memory region is freed but subsequently referenced, creating a dangling pointer condition that can be exploited through carefully crafted UI interactions.

The exploitation requires user interaction through specific UI gestures, which an attacker could trigger by luring victims to a malicious webpage containing specially crafted HTML content. When the vulnerable code path is reached, the freed memory may be reallocated for different purposes, allowing an attacker to manipulate the contents and potentially achieve arbitrary code execution or cause the browser to crash.

Root Cause

The root cause stems from improper memory lifecycle management within the Ozone display abstraction layer. When certain UI gesture events are processed, the code fails to properly track object lifetimes, resulting in a situation where memory is freed while references to that memory still exist. Subsequent access to these dangling pointers leads to heap corruption, as the memory may have been reallocated for other purposes or contain attacker-controlled data.

Attack Vector

An attacker exploiting this vulnerability would need to:

1. Craft a malicious HTML page designed to trigger the specific UI gesture sequence
2. Convince a victim to visit the malicious page (via phishing, social engineering, or compromised websites)
3. Have the victim perform the required UI interactions while on the page
4. Exploit the resulting heap corruption to execute arbitrary code or crash the browser

The attack is remote in nature but requires user interaction, which somewhat limits the ease of exploitation. However, the UI gestures required may be common actions that users perform naturally while browsing.

The vulnerability manifests in the Ozone component's memory handling during UI gesture processing. For detailed technical information about the specific code paths involved, refer to the Chromium Issue Tracker Entry.

Detection Methods for CVE-2026-2321

Indicators of Compromise

• Unexpected Chrome/Chromium browser crashes when interacting with web pages
• Memory access violations or heap corruption error messages in browser crash logs
• Unusual process behavior or child process spawning from Chrome instances
• Browser renderer process crashes with UAF-related signatures

Detection Strategies

• Monitor for Chrome crash reports containing Ozone-related stack traces
• Deploy browser version auditing to identify instances running versions prior to 145.0.7632.45
• Implement endpoint detection for heap spray patterns characteristic of UAF exploitation
• Enable Chrome crash reporting and analyze patterns for Ozone component failures

Monitoring Recommendations

• Configure SIEM rules to alert on multiple Chrome process crashes within short time windows
• Monitor network traffic for connections to known malicious domains serving exploit content
• Enable browser telemetry and crash reporting at the enterprise level
• Audit Chrome extension installations that could be used to deliver exploit triggers

How to Mitigate CVE-2026-2321

Immediate Actions Required

• Update Google Chrome to version 145.0.7632.45 or later immediately
• Enable automatic Chrome updates across all endpoints to ensure timely patching
• Audit enterprise environments for instances running vulnerable Chrome versions
• Consider implementing web filtering to block access to known malicious sites

Patch Information

Google has addressed this vulnerability in Chrome version 145.0.7632.45. Organizations and users should update to this version or later to receive the security fix. Detailed release information is available in the Google Chrome Update Announcement.

For enterprises managing Chrome deployments, use your preferred software distribution mechanism to push the updated version to all managed endpoints.

Workarounds

• If immediate patching is not possible, consider using alternative browsers temporarily
• Implement strict web browsing policies limiting access to untrusted sites
• Deploy browser isolation solutions to contain potential exploitation attempts
• Educate users about avoiding suspicious links and unknown websites

# Verify Chrome version and update status
google-chrome --version
# Expected output should show 145.0.7632.45 or later

# Force Chrome update check (Linux)
sudo apt update && sudo apt upgrade google-chrome-stable

# Enterprise deployment verification
# Check Chrome policies for automatic updates
cat /etc/opt/chrome/policies/managed/update_policy.json