CVE-2026-99010 Bluetooth: RFCOMM: free the skb when the DLC has no owner
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99010?
CVE-2026-99010 is a vulnerability in Linux, published on 23 Oct 2026.
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.
Which versions are affected by CVE-2026-99010?
How do I fix CVE-2026-99010?
Upgrade to a fixed version.
Is CVE-2026-99010 being exploited?
There is no known exploitation of CVE-2026-99010 in the wild and no public exploit code.
Sources
Also known as AZL-110858, BELL-CVE-2026-99010, DEBIAN-CVE-2026-99010, GHSA-7365-w977-m58v, UBUNTU-CVE-2026-99010.