Executive Summary

This vulnerability exists in the Linux kernel's Bluetooth L2CAP implementation. The issue arises because the code accepts multiple L2CAP_ECRED_CONN_REQ requests without properly checking the command identifier. According to the Bluetooth specification, each successive request on a signaling channel must use a different identifier. However, the vulnerable code may mark multiple requests with the same identifier as pending, leading to more than the allowed maximum number of connections (L2CAP_ECRED_MAX_CID, which is 5) being allocated. This can cause an overflow in the l2cap_ecred_rsp_defer structure.

The fix involves checking if there are any channels pending with the same identifier and rejecting new requests if duplicates are found, thus enforcing the specification requirement.

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Impact Analysis

This vulnerability can lead to an overflow condition in the Bluetooth L2CAP layer of the Linux kernel. Such an overflow might cause unexpected behavior, including potential denial of service or instability in the Bluetooth subsystem. It could allow attackers to exploit the overflow to disrupt Bluetooth communications or possibly escalate to further attacks depending on the system context.

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Mitigation Strategies

The vulnerability has been resolved in the Linux kernel by fixing the Bluetooth L2CAP code to properly check and reject multiple L2CAP_ECRED_CONN_REQ requests with the same identifier. To mitigate this vulnerability, you should update your Linux kernel to a version that includes this fix.

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