CVE-2026-74541 Bluetooth: ISO: clear iso_data always when detaching conn from hcon
A use-after-free vulnerability in the Linux kernel Bluetooth ISO subsystem allows attackers to cause denial of service or potentially execute code.
- 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-2026-74541?
CVE-2026-74541 is a high-severity use after free 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: clear iso_data always when detaching conn from hcon
When setting conn->hcon = NULL, also conn->hcon->iso_data = NULL is necessary, otherwise later iso_conn_free() will UAF.
Fix clearing of iso_data in iso_sock_disconn()
Fixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on iso_sock_release() followed by hci_abort_conn_sync().
Which versions are affected by CVE-2026-74541?
How do I fix CVE-2026-74541?
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-2026-74541 being exploited?
There is no known exploitation of CVE-2026-74541 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74541, DEBIAN-CVE-2026-74541, GHSA-jwr7-m8vx-rqm4, UBUNTU-CVE-2026-74541.