CVE-2026-68390 Bluetooth: hci_sync: hold hdev->lock for hci_conn_params lookups
A race condition in the Linux kernel Bluetooth subsystem can lead to unsafe list iteration, potentially causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68390?
CVE-2026-68390 is a high-severity vulnerability in Linux, published on 10 Aug 2026. 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_sync: hold hdev->lock for hci_conn_params lookups
hci_conn_params_lookup requires hdev->lock be held, otherwise the list iteration or param access is not safe.
Hold hdev->lock for params lookups in hci_sync.
Which versions are affected by CVE-2026-68390?
How do I fix CVE-2026-68390?
Apply the vendor's patch.
Is CVE-2026-68390 being exploited?
There is no known exploitation of CVE-2026-68390 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-68390, GHSA-rqw2-7c22-q555, UBUNTU-CVE-2026-68390.