CVE-2022-26385

What it actually does

Use-after-free condition triggered when an individual thread outlives its manager during browser shutdown, resulting in invalid memory access and a potentially exploitable crash.

Why it matters to the business

Browser instability and crashes that interrupt user sessions, reduce productivity, and create risk of data loss or service disruption for organizations relying on the affected browser.

How an attack unfolds

An attacker crafts a web page or extension that forces an unusual shutdown sequence while a background thread remains active, allowing the dangling reference to be abused for memory corruption and potential code execution.

How to fix it

Upgrade Mozilla Firefox to version 98 or later. Enforce automatic updates across the environment and remove any pinned older releases.

How to confirm the fix worked

Confirm all instances report version 98 or newer via enterprise management tools or about:support; retest shutdown sequences under load to verify absence of the prior crash signature.

Typical attack path

1. Deliver malicious content via a web page, advertisement, or extension that interacts with browser shutdown paths
2. Trigger conditions that cause the manager thread to terminate before a dependent worker thread completes
3. Reference the now-freed memory object to induce a crash or corrupt memory state
4. Leverage the resulting corruption for further exploitation or denial of service

How to detect it

Search browser crash reports and telemetry for shutdown-related use-after-free signatures; review system logs for unexpected Firefox process terminations during user logout or application close events.

What your security team should do

• Prioritize immediate deployment of Firefox 98+ to all endpoints
• Monitor update compliance dashboards for any remaining pre-98 installations
• Review browser extension and web application usage that may trigger complex shutdown paths
• Include browser version checks in periodic vulnerability scans