CVE-2026-74539 Bluetooth: ISO: lock sk in iso_sock_getname
A race condition in the Linux kernel Bluetooth ISO subsystem allows attackers to cause a denial of service by accessing connection data without proper locking.
- 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-2026-74539?
CVE-2026-74539 is a high-severity vulnerability in Linux, published on 15 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: ISO: lock sk in iso_sock_getname
Accessing iso_pi(sk)->conn requires lock_sock, which is not held here.
Fix by adding the lock/release.
Which versions are affected by CVE-2026-74539?
How do I fix CVE-2026-74539?
Apply the vendor's patch.
Is CVE-2026-74539 being exploited?
There is no known exploitation of CVE-2026-74539 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74539, DEBIAN-CVE-2026-74539, GHSA-c98p-qcxp-3m7h, UBUNTU-CVE-2026-74539.