CVE-2026-99010Bluetooth: RFCOMM: free the skb when the DLC has no owner

Official description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: free the skb when the DLC has no owner rfcomm_recv_data() hands the skb to d->data_ready() and returns 0 without freeing it, so the callback owns the skb from that point on. The tty implementation frees it when the DLC has been detached from its device: static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb) { struct rfcomm_dev *dev = dlc->owner; if (!dev) { kfree_skb(skb); return; } The socket implementation returns without freeing it, and the skb is leaked. A connected DLC can have no owner: rfcomm_sock_destruct() clears d->owner, while the DLC itself stays on the session until it is closed. Data frames that arrive in that window still find d->state == BT_CONNECTED in rfcomm_recv_data() and are handed to the callback, one leaked skb each. The leak does not stop on its own either. The remote runs out of credits only once RFCOMM_RX_THROTTLED is set, and for a socket the only place that sets it is rfcomm_sk_data_ready() itself, below the return. rfcomm_process_dlcs() keeps granting credits, so the remote keeps sending and the leak keeps growing. Free the skb, as the tty side does.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/05145638e0db770267c39615c8ce51ab058e34cf
• https://git.kernel.org/stable/c/91492e9194f3b10bc1eb50683ac440b74a487e39
• https://git.kernel.org/stable/c/a835b7f445427c7bdfc7169a97e0a1bec375e408
• https://git.kernel.org/stable/c/a54ce160e3ef7e50ec94e0ac4131c3d0f9f739b9
• https://git.kernel.org/stable/c/c3f76b025cbbb0ab47310dbe7de18092d89f2a99
• https://git.kernel.org/stable/c/4f46de658ce61968aef5ea7ae809d1c180330544
• https://git.kernel.org/stable/c/b8814161b14c610b7a09527433301d8ad8180aef
• https://git.kernel.org/stable/c/9d1afbf60ed53c5b051cd124153e0ae3078c8b93