CVE-2026-80759 Bluetooth: hci_aml: validate firmware segment lengths
A missing length validation in the Linux kernel Bluetooth driver allows attackers to trigger memory corruption via a malicious firmware image.
- 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-2026-80759?
CVE-2026-80759 is a memory corruption vulnerability in Linux, published on 4 Sep 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_aml: validate firmware segment lengths
aml_download_firmware() reads two lengths from the firmware header and uses them to build pointers before checking that the header and segment data are present. A truncated or inconsistent firmware image can make the driver read past firmware->data while constructing TCI commands.
Reject images shorter than the header and ensure that the ICCM and DCCM ranges fit within the loaded firmware before downloading either segment.
Which versions are affected by CVE-2026-80759?
How do I fix CVE-2026-80759?
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-2026-80759 being exploited?
There is no known exploitation of CVE-2026-80759 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80759, DEBIAN-CVE-2026-80759, GHSA-q3hj-w9xj-vc4p, UBUNTU-CVE-2026-80759.