CVE-2026-80763 Bluetooth: hci_event: validate LE Set CIG Parameters response
A missing validation in the Linux kernel Bluetooth driver allows out-of-bounds reads from malformed responses, potentially causing crashes or code execution.
- 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-2026-80763?
CVE-2026-80763 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_event: validate LE Set CIG Parameters response
The Command Complete dispatch validates only the fixed part of the LE Set CIG Parameters response. After that part is pulled from the skb, hci_cc_le_set_cig_params() trusts num_handles and reads each entry in the trailing handle array.
Matching num_handles against the command's num_cis does not guarantee that the response contains the advertised handles. A truncated response from a malfunctioning controller can therefore make the handler read beyond the skb data.
Validate that the remaining skb data contains all advertised handles. Include this in the existing response validation so malformed responses also follow the established CIG failure handling.
Which versions are affected by CVE-2026-80763?
How do I fix CVE-2026-80763?
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-2026-80763 being exploited?
There is no known exploitation of CVE-2026-80763 in the wild and no public exploit code.
Sources
Also known as AZL-99654, BELL-CVE-2026-80763, DEBIAN-CVE-2026-80763, GHSA-cxj6-pxrj-qc44, UBUNTU-CVE-2026-80763.