CVE-2022-50447 Bluetooth: hci_conn: Fix crash on hci_create_cis_sync
A null pointer dereference in the Linux kernel Bluetooth subsystem allows local attackers to cause a system crash by connecting multiple ISO sockets.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-50447?
CVE-2022-50447 is a medium-severity vulnerability in Linux kernel, published on 1 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_conn: Fix crash on hci_create_cis_sync
When attempting to connect multiple ISO sockets without using DEFER_SETUP may result in the following crash:
BUG: KASAN: null-ptr-deref in hci_create_cis_sync+0x18b/0x2b0 Read of size 2 at addr 0000000000000036 by task kworker/u3:1/50
CPU: 0 PID: 50 Comm: kworker/u3:1 Not tainted 6.0.0-rc7-02243-gb84a13ff4eda #4373 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.0-1.fc36 04/01/2014 Workqueue: hci0 hci_cmd_sync_work Call Trace: <TASK> dump_stack_lvl+0x19/0x27 kasan_report+0xbc/0xf0 ? hci_create_cis_sync+0x18b/0x2b0 hci_create_cis_sync+0x18b/0x2b0 ? get_link_mode+0xd0/0xd0 ? __ww_mutex_lock_slowpath+0x10/0x10 ? mutex_lock+0xe0/0xe0 ? get_link_mode+0xd0/0xd0 hci_cmd_sync_work+0x111/0x190 process_one_work+0x427/0x650 worker_thread+0x87/0x750 ? process_one_work+0x650/0x650 kthread+0x14e/0x180 ? kthread_exit+0x50/0x50 ret_from_fork+0x22/0x30 </TASK>
Weakness: CWE-476
Which versions are affected by CVE-2022-50447?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-50447?
Apply the vendor's patch.
Is CVE-2022-50447 being exploited?
There is no known exploitation of CVE-2022-50447 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-50447, GHSA-x767-vgjw-4wwh, UBUNTU-CVE-2022-50447.