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Due to an unchecked buffer length, a specially crafted L2CAP packet can cause a buffer overflow. This buffer overflow triggers an assert, which results in a temporary denial of service. 

If a watchdog timer is not enabled, a hard reset is required to recover the device.

CVE-2024-7139 is a medium-severity vulnerability identified in the Silicon Labs RS9116 Bluetooth SDK, specifically involving an out-of-bounds write condition (CWE-787) triggered by an unchecked buffer length in the processing of L2CAP packets. The vulnerability arises when a specially crafted L2CAP packet is received by the Bluetooth stack, causing a buffer overflow that leads to an assertion failure. This assertion failure results in a temporary denial of service (DoS) condition on the affected device. The impact is primarily on availability, as the device's Bluetooth functionality is disrupted. If the device does not have a watchdog timer enabled to automatically recover from the fault, manual intervention via a hard reset is required to restore normal operation. The vulnerability does not affect confidentiality or integrity directly and does not require authentication or user interaction to be exploited, but the attack vector is remote and requires Bluetooth connectivity (AV:A - adjacent network). The CVSS 3.1 base score is 6.5, reflecting a medium severity level due to the ease of exploitation (low complexity, no privileges required) but limited impact scope (availability only). No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability affects version 0 of the RS9116 Bluetooth SDK, which is used in embedded systems and IoT devices that incorporate Silicon Labs' Bluetooth modules. The root cause is a lack of proper bounds checking on buffer sizes when handling L2CAP packets, a fundamental protocol layer in Bluetooth communication, which could be exploited by an attacker in proximity to the device to disrupt its Bluetooth service temporarily.

Detailed information about CVE-2024-7139: CWE-787 Out-of-bounds Write in silabs.com RS9116 Bluetooth SDK affecting silabs.com RS9116 Bluetooth SDK. Get real-tim

CVE-2024-7139: CWE-787 Out-of-bounds Write in silabs.com RS9116 Bluetooth SDK - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2024-7139: CWE-787 Out-of-bounds Write in silabs.com RS9116 Bluetooth SDK

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