CVE-2025-48525: 
NixOS vulnerability analysis and mitigation

CVE-2025-48525 is a local privilege escalation vulnerability in Android's DisassociationProcessor.java that allows an app to continue reading notifications even after it is no longer associated with a companion device, due to improper input validation in the disassociate method. It affects Android versions 13, 14, 15, and 16. The vulnerability was disclosed on December 8, 2025, with patches included in the Android Security Bulletin dated December 1, 2025. It carries a CVSS v3.1 base score of 7.8 (High) (Android Security Bulletin).

The root cause is improper input validation (CWE-20) in the disassociate method of DisassociationProcessor.java within the Android framework (frameworks/base). When a companion device association is removed, the disassociation logic fails to properly validate or enforce the revocation of notification access, allowing a low-privileged app to retain the ability to read notifications it should no longer have access to. Exploitation requires only local access with low privileges and no user interaction. Patches are available in the Android source repository at two specific commits (Android Source Commit 1, Android Source Commit 2).

Successful exploitation allows a low-privileged local application to escalate its privileges and continue accessing device notifications without a valid companion device association. This affects confidentiality (unauthorized access to potentially sensitive notification content), integrity (ability to manipulate system state), and availability (high impact per CVSS scoring). An attacker could leverage persistent notification access to harvest sensitive data such as authentication codes, messages, or alerts from other applications (Android Security Bulletin).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation at this time. The EPSS score is extremely low at 0.0001, reflecting minimal current exploitation probability. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been reported (Android Security Bulletin).

1. Install a malicious app: Deploy a low-privileged Android application that requests companion device association and notification access on a target device running Android 13, 14, 15, or 16.
2. Establish companion device association: Use the Android Companion Device Manager API to associate the app with a companion device, granting it legitimate notification read access.
3. Trigger disassociation: Initiate the disassociation process (e.g., the companion device is removed or the association is revoked), which invokes the vulnerable disassociate method in DisassociationProcessor.java.
4. Exploit improper validation: Due to the improper input validation flaw, the app's notification listener access is not properly revoked during disassociation, allowing the app to continue reading device notifications.
5. Harvest sensitive data: The app silently reads ongoing notifications — including OTPs, messages, and alerts — without the user's knowledge or a valid companion device association (Android Security Bulletin).

• Logs: Android system logs (logcat) showing notification access events from an app after its companion device association has been removed; entries referencing DisassociationProcessor or CompanionDeviceManager with unexpected app package names.
• Application Behavior: Apps retaining NotificationListenerService binding or receiving onNotificationPosted callbacks after companion device disassociation.
• System: Unexpected entries in the Companion Device Manager association list, or discrepancies between active notification listeners and registered companion device associations via adb shell dumpsys companiondevice.

Apply the patches included in the Android Security Bulletin for December 1, 2025, which address this vulnerability for Android 13, 14, 15, and 16. The specific fixes are available in the Android open-source repository via two commits to frameworks/base. No configuration-based workaround has been published; upgrading to a patched security patch level (2025-12-01 or later) is the recommended remediation. Additionally, reviewing and restricting app permissions — particularly notification access — can reduce exposure on unpatched devices (Android Security Bulletin, Android Source Commit 1).

The vulnerability was covered as part of broader reporting on Google's December 2025 Android Security Bulletin, which addressed over 100 vulnerabilities including zero-days. Security news outlets such as CyberSecurityNews and HealSecurity highlighted the bulletin's scope, though CVE-2025-48525 itself did not receive significant individual attention given the absence of active exploitation (Android Security Bulletin).