Comprehensive Technical Analysis of CVE-2025-13834 A Bluetooth RFCOMM Out-of-Bounds Read Vulnerability in Modern Wireless Devices

CVE-2025-13834 Technical Summary

Vulnerability Type: Memory Disclosure / Out-of-Bounds (OOB) Read (CWE-125). CVSS Score: 7.5–8.1 (High/Critical).

Vector: Adjacent Network (Bluetooth range) via single-packet exploit without authentication.

Root Cause: A critical flaw exists in the RFCOMM protocol’s TEST command (Frame Type 0x10). The implementation fails to validate the length field in the command header against the actual payload received. An attacker can declare a maximum length (127 bytes) while sending minimal data. This causes memcpy() to read beyond the buffer, extracting uninitialized kernel or heap memory