CVE-2026-72334 Bluetooth: ISO: fix malformed ISO_END/CONT handling
A malformed Bluetooth ISO packet sequence can cause a kernel panic or memory leak, allowing local attackers to crash the system or potentially read memory.
- 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-2026-72334?
CVE-2026-72334 is a high-severity memory corruption 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: fix malformed ISO_END/CONT handling
Core specification (Part C vol 4 sec 5.4.5) does not exclude empty ISO_CONT, ISO_END packets. We currently reject them if they are last.
If controller sends malformed sequence
ISO_START -> rx_len = 4, ISO_CONT skb->len 4, ISO_START
that ends payload in ISO_CONT, we leak conn->rx_skb. If controller sends too long ISO_END, we panic on skb_put. If controller sends too short ISO_END we accept it.
Fix by marking unfinished ISO_START via conn->rx_skb != NULL. Check skb->len properly before skb_put. Combine the ISO_CONT/END code paths as they require the same initial checks. Reject too short ISO_END packets.
Which versions are affected by CVE-2026-72334?
How do I fix CVE-2026-72334?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-72334 being exploited?
There is no known exploitation of CVE-2026-72334 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72334, DEBIAN-CVE-2026-72334, GHSA-xw94-8v7c-8xwr, UBUNTU-CVE-2026-72334.