CVE-2026-64408 Bluetooth: bnep: pin L2CAP connection during netdev registration
A race condition in the Linux kernel Bluetooth BNEP module allows attackers to trigger a use-after-free, potentially leading to code execution or system crashes.
- 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-2026-64408?
CVE-2026-64408 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jul 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: bnep: pin L2CAP connection during netdev registration
bnep_add_connection() reads the L2CAP connection without holding the channel lock, then passes its HCI device to register_netdev(). Controller teardown can clear and release that connection concurrently, leaving the network device registration path to dereference a freed parent device.
Take a reference to the L2CAP connection while holding the channel lock. Retain it until register_netdev() has taken the parent device reference.
Weakness: CWE-416
Which versions are affected by CVE-2026-64408?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64408?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-64408 being exploited?
There is no known exploitation of CVE-2026-64408 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-93788, BELL-CVE-2026-64408, DEBIAN-CVE-2026-64408, GHSA-mgrm-7xvj-2jr3, ROOT-OS-DEBIAN-12-CVE-2026-64408, ROOT-OS-UBUNTU-2204-CVE-2026-64408 and 1 more.