A critical out of bounds write vulnerability in the Android kernel allows local attackers to achieve unauthorized privilege escalation.

The vulnerability exists in the GetTachyonCommand function within tachyon_server_common.h, where a failure to validate bounds results in an out of bounds write. This flaw allows a local user to escalate privileges without requiring additional permissions or user interaction.

Successful exploitation of this vulnerability permits a local attacker to gain elevated privileges on a compromised Android device. Given the CVSS score of 7.8, this represents a high-severity risk that could lead to complete system compromise, data theft, and the bypass of critical security controls. Protecting mobile assets is essential, as this escalation could provide a foundation for persistent malware or further lateral movement within an enterprise environment.

Immediate Action: Review the Google Android Security Bulletin for December 2025 and apply the relevant kernel security patches to all managed devices.

Proactive Monitoring: Monitor system logs for anomalous kernel activities or unexpected process privilege changes that may indicate exploitation attempts.

Compensating Controls: Ensure all mobile device management policies are strictly enforced and limit the installation of untrusted applications, which serves to minimize the attack surface for local privilege escalation.

Public Exploit Available: No (exploit_available: false)

This vulnerability presents a significant risk to device integrity and user data confidentiality. Security administrators must prioritize the deployment of the December 2025 Android security patches across their device fleets. Until updates are applied, maintain strict control over device access and application deployment to mitigate the risk of local exploitation.