CVE-2025-22408: Google Android RCE Vulnerability

CVE-2025-22408 Overview

CVE-2025-22408 is a critical use-after-free vulnerability in the Android Bluetooth stack, specifically in the rfc_check_send_cmd function within rfc_utils.cc. This memory corruption flaw enables remote code execution without requiring any user interaction or additional execution privileges, making it a severe threat to Android devices with Bluetooth functionality enabled.

Critical Impact

Remote attackers can execute arbitrary code on vulnerable Android devices via the Bluetooth RFCOMM protocol without any user interaction required.

Affected Products

• Google Android 15.0

Discovery Timeline

• 2025-08-26 - CVE-2025-22408 published to NVD
• 2025-09-02 - Last updated in NVD database

Technical Details for CVE-2025-22408

Vulnerability Analysis

This vulnerability exists in the RFCOMM (Radio Frequency Communication) protocol implementation within Android's Bluetooth module. The rfc_check_send_cmd function in rfc_utils.cc contains a use-after-free condition where memory is accessed after being deallocated.

The flaw occurs when the RFCOMM layer processes command messages, where a memory object is freed but a reference to that memory location is retained and subsequently used. When this dangling pointer is dereferenced, an attacker can manipulate the freed memory region to achieve arbitrary code execution.

What makes this vulnerability particularly dangerous is that it can be triggered remotely over Bluetooth without requiring user interaction, and successful exploitation grants code execution without needing additional privileges on the target device.

Root Cause

The root cause is improper memory management in the RFCOMM utility functions. When processing certain Bluetooth protocol commands, the code frees a memory buffer but fails to nullify the pointer or properly validate that the memory region is still valid before subsequent access. This creates a classic use-after-free (CWE-416) condition where the application operates on memory that has been returned to the heap.

Attack Vector

The vulnerability is exploitable over the network via Bluetooth connectivity. An attacker within Bluetooth range can send specially crafted RFCOMM protocol messages to a target device. The attack requires:

1. Bluetooth to be enabled on the target device
2. The attacker to be within Bluetooth range
3. Crafted malicious RFCOMM commands that trigger the use-after-free condition

No user interaction is required, meaning the attack can succeed silently without the device owner's knowledge. The attacker does not need any existing privileges on the target system.

The vulnerability mechanism involves sending malicious RFCOMM commands that cause the rfc_check_send_cmd function to access previously freed memory. By carefully controlling the heap state and the contents of the freed memory region, an attacker can redirect program execution to achieve arbitrary code execution. For detailed technical information, see the Android Bluetooth Module Update.

Detection Methods for CVE-2025-22408

Indicators of Compromise

• Unusual Bluetooth activity or connection attempts from unknown devices
• Unexpected system crashes or restarts related to Bluetooth services
• Anomalous memory allocation patterns in Bluetooth-related processes
• Suspicious log entries in Android system logs referencing RFCOMM or Bluetooth stack errors

Detection Strategies

• Monitor Android device logs for crashes in the com.android.bluetooth process
• Implement network-level Bluetooth traffic analysis to detect malformed RFCOMM packets
• Deploy endpoint detection solutions capable of monitoring Android Bluetooth stack behavior
• Use memory forensics tools to identify signs of heap manipulation or use-after-free exploitation

Monitoring Recommendations

• Enable verbose logging for Bluetooth services on managed devices where feasible
• Implement centralized log collection from Android devices in enterprise environments
• Monitor for unexpected Bluetooth pairing requests or connections
• Track security patch levels across the Android device fleet to identify vulnerable systems

How to Mitigate CVE-2025-22408

Immediate Actions Required

• Apply the March 2025 Android security patch immediately on all affected devices
• Disable Bluetooth on devices that cannot be immediately patched when not actively in use
• Implement network segmentation to limit Bluetooth-enabled device exposure
• Configure Android devices to non-discoverable mode when Bluetooth must remain enabled

Patch Information

Google has addressed this vulnerability in the Android Security Bulletin March 2025. The fix is available through the Android Bluetooth module update at commit 806774b1cf641e0c0e7df8024e327febf23d7d7c. Organizations should ensure all Android 15.0 devices receive the security update containing this patch.

Workarounds

• Disable Bluetooth functionality entirely on devices that cannot receive the security update
• Enable Bluetooth only when actively needed and disable immediately after use
• Configure devices to reject incoming Bluetooth connections from unknown or unpaired devices
• Implement Mobile Device Management (MDM) policies to enforce Bluetooth restrictions on enterprise devices

# Android ADB commands to disable Bluetooth (requires root or ADB access)
adb shell settings put global bluetooth_on 0
adb shell am broadcast -a android.bluetooth.adapter.action.REQUEST_DISABLE