CVE-2026-74303 Bluetooth: hci_qca: fix NULL pointer dereference in qca_dmp_hdr() for non-serdev device
A NULL pointer dereference in the Linux kernel Bluetooth driver allows local attackers to cause a system crash.
- 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-2026-74303?
CVE-2026-74303 is a 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: hci_qca: fix NULL pointer dereference in qca_dmp_hdr() for non-serdev device
hu->serdev is NULL for hci_uart attached via non-serdev paths, but qca_dmp_hdr() unconditionally dereferences hu->serdev->dev.driver->name, causing a NULL pointer dereference.
Fix by guarding the dereference with a NULL check and falling back to "hci_ldisc_qca" for the non-serdev case.
Which versions are affected by CVE-2026-74303?
How do I fix CVE-2026-74303?
Apply the vendor's patch.
Is CVE-2026-74303 being exploited?
There is no known exploitation of CVE-2026-74303 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74303, DEBIAN-CVE-2026-74303, GHSA-c62v-fhpj-c23c, UBUNTU-CVE-2026-74303.