This vulnerability is a use-after-free flaw in the ReadingMode feature of Google Chrome before version 148.0.7778.96. It enables a remote attacker, who has already compromised the renderer process, to execute arbitrary code inside the sandbox by delivering a specially crafted HTML page. The issue is recognized by Chromium security as medium severity. The fixed version is 148.0.7778.96, indicating that updating to this or a later version mitigates the vulnerability. No detailed exploitation techniques or impact beyond code execution in sandbox are described.

Successful exploitation allows arbitrary code execution within the sandboxed renderer process of Chrome, which could lead to further compromise of the browser environment. However, exploitation requires prior compromise of the renderer process. No known active exploits have been reported. The vulnerability is rated medium severity by Chromium security.

Update Google Chrome to version 148.0.7778.96 or later, as this version includes the fix for this use-after-free vulnerability. Since the vendor advisory points to the stable channel update announcement, applying the latest stable update is the recommended remediation. There is no indication that additional mitigation steps are required beyond updating.