CVE-2025-48558: 
NixOS vulnerability analysis and mitigation

CVE-2025-48558 is an implicit intent hijacking vulnerability in Android's BatteryService.java that enables local privilege escalation. Affecting Android versions 13, 14, 15, and 16, the flaw allows a low-privileged attacker to intercept implicit intents intended for system apps without requiring additional execution privileges or user interaction. It was disclosed as part of the Android Security Bulletin dated September 1, 2025, and carries a CVSS v3.1 base score of 7.8 (High) (Android Bulletin).

The vulnerability is classified under CWE-927 (Use of Implicit Intent for Sensitive Communication). Multiple functions within BatteryService.java send implicit intents — broadcast messages not addressed to a specific component — that are intended for privileged system applications. A malicious app with low-privilege local access can register to receive these intents, effectively hijacking the communication channel and gaining access to sensitive system-level operations. The patch commit is available at the Android open-source repository (Android Source Patch, Android Bulletin).

Successful exploitation allows a local attacker to escalate privileges by intercepting system-level intents from BatteryService, potentially gaining unauthorized access to sensitive system components and the ability to execute privileged actions. The impact spans high confidentiality, integrity, and availability consequences on the affected device. While the attack is constrained to local access, it requires no user interaction, making it a meaningful threat on shared or compromised devices (Android Bulletin).

1. Reconnaissance: Identify a target Android device running version 13, 14, 15, or 16 that has not yet applied the September 2025 security patch.
2. Develop malicious app: Create an Android application that registers a broad BroadcastReceiver with intent filters matching the implicit intents sent by BatteryService.java (e.g., battery state change actions).
3. Install on device: Install the malicious app on the target device, requiring only standard user-level (low-privilege) access — no root or special permissions needed.
4. Intercept implicit intent: When BatteryService broadcasts an implicit intent intended for a system app, the malicious receiver intercepts it, gaining access to the intent's data and potentially the ability to respond in place of the legitimate system component.
5. Achieve privilege escalation: Leverage the hijacked intent to perform privileged actions, access sensitive system data, or manipulate system behavior beyond the attacker's normal permission scope (Android Bulletin, Android Source Patch).

• Logs: Android system logs (logcat) showing unexpected apps receiving battery-related broadcast intents (e.g., ACTION_BATTERY_CHANGED, ACTION_BATTERY_LOW) from BatteryService.
• Application Behavior: Presence of a third-party app with a BroadcastReceiver registered for battery or power-related implicit intents without a clear functional need.
• Process: Unusual process activity from non-system apps following battery state change events, particularly apps accessing system-level resources shortly after receiving such broadcasts.

Google has released a patch as part of the Android Security Bulletin for September 1, 2025 (patch level 2025-09-01). Users and administrators should update affected Android devices (versions 13, 14, 15, and 16) to the patched security patch level immediately. OEM-specific updates (e.g., Samsung's September 2025 security update) also incorporate this fix. No configuration-based workaround is available; applying the security update is the only recommended remediation (Android Bulletin, CIS Advisory).

The CIS (Center for Internet Security) issued an advisory noting multiple vulnerabilities in the September 2025 Android OS update, including CVE-2025-48558, warning of potential privilege escalation risks (CIS Advisory). Samsung acknowledged the vulnerability in its September 2025 security update communications, with coverage from device-focused outlets noting affected Galaxy models (SammyFans). No significant independent researcher commentary or social media discussion has been identified for this specific CVE.