CVE-2025-48654: Google Android Privilege Escalation Flaw

CVE-2025-48654 Overview

CVE-2025-48654 is a local privilege escalation vulnerability affecting Google Android's CompanionDeviceManagerService.java. The flaw exists in the onStart method where a confused deputy vulnerability allows an attacker to escalate privileges without requiring any additional execution privileges or user interaction. This vulnerability stems from a logic error in the code that enables unauthorized privilege escalation on affected Android devices.

Critical Impact

Local attackers can exploit this confused deputy vulnerability to gain elevated privileges on affected Android 16.0 devices without user interaction, potentially compromising device security and user data.

Affected Products

• Google Android 16.0
• Google Android 16.0 QPR2 Beta 1
• Google Android 16.0 QPR2 Beta 2
• Google Android 16.0 QPR2 Beta 3

Discovery Timeline

• 2026-03-02 - CVE-2025-48654 published to NVD
• 2026-03-03 - Last updated in NVD database

Technical Details for CVE-2025-48654

Vulnerability Analysis

This vulnerability is classified as a confused deputy attack (CWE-610: Externally Controlled Reference to a Resource in Another Sphere), which occurs when a privileged system service is tricked into performing actions on behalf of an unprivileged caller. The CompanionDeviceManagerService is a system-level Android service responsible for managing companion device associations, such as those used by smartwatches and other Bluetooth-connected accessories.

The logic error in the onStart method of CompanionDeviceManagerService.java allows a local attacker to leverage the service's elevated privileges to perform unauthorized operations. Because the service runs with system-level permissions, successful exploitation enables an attacker to escalate from a low-privileged application context to gain high confidentiality, integrity, and availability impact on the affected device.

Root Cause

The root cause is a logic error within the onStart method of CompanionDeviceManagerService.java. The service fails to properly validate or restrict certain operations during initialization, creating a confused deputy scenario where the privileged service can be manipulated to act on behalf of an unauthorized caller. This design flaw allows local processes to abuse the trust relationship between the service and the Android framework.

Attack Vector

The attack vector is local, requiring the attacker to have some level of access to the target Android device. This could be achieved through a malicious application installed on the device. The exploitation requires low privileges and no user interaction, making it particularly dangerous for devices running affected Android 16.0 versions.

The attack works by exploiting the confused deputy condition where the CompanionDeviceManagerService acts as an intermediary. An attacker can craft requests that trick the service into performing privileged operations on behalf of the unprivileged attacker process. The service's failure to properly verify authorization for certain operations during its onStart phase enables this privilege escalation path.

Detection Methods for CVE-2025-48654

Indicators of Compromise

• Unusual activity from applications attempting to interact with CompanionDeviceManagerService outside normal companion device pairing workflows
• Unexpected privilege escalation events or permission grants to third-party applications
• Anomalous system service behavior during device boot or service restart sequences

Detection Strategies

• Monitor for suspicious inter-process communication (IPC) calls targeting the CompanionDeviceManagerService
• Implement runtime application self-protection (RASP) to detect privilege escalation attempts
• Deploy mobile threat defense (MTD) solutions to identify applications exhibiting suspicious behavior patterns
• Review application permissions and revoke unnecessary access to companion device functionality

Monitoring Recommendations

• Enable comprehensive logging for Android system services, particularly focusing on CompanionDeviceManagerService activity
• Implement anomaly detection for privilege escalation patterns on Android endpoints
• Configure SentinelOne Mobile Threat Defense to monitor for suspicious service interactions and privilege changes
• Regularly audit installed applications for potential malicious behavior targeting system services

How to Mitigate CVE-2025-48654

Immediate Actions Required

• Apply the March 2026 Android Security Bulletin patches immediately to all affected devices
• Review installed applications and remove any untrusted or suspicious applications from affected devices
• Enable SentinelOne Mobile Threat Defense for comprehensive protection against local privilege escalation attacks
• Consider restricting companion device functionality on high-security devices until patches are applied

Patch Information

Google has addressed this vulnerability in the Android Security Bulletin March 2026. Organizations should ensure all Android 16.0 devices receive this security update through their normal patch management processes. Enterprise mobility management (EMM) solutions should be configured to enforce minimum security patch levels that include this fix.

Workarounds

• Restrict installation of applications from unknown sources to reduce the risk of malicious application deployment
• Implement strict application vetting policies for enterprise-managed devices
• Consider disabling or restricting companion device associations on high-value target devices until patches can be applied
• Deploy network-level monitoring to detect any suspicious lateral movement from compromised Android devices

Organizations using SentinelOne can leverage the platform's behavioral AI engine to detect and prevent exploitation attempts targeting this vulnerability class. The Singularity Mobile agent provides real-time protection against privilege escalation attacks on Android devices.