CVE-2026-97508 thunderbolt: Set tb->root_switch to NULL when domain is stopped
A null pointer dereference in the Linux kernel Thunderbolt driver can cause a system crash when a domain is stopped.
- 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-2026-97508?
CVE-2026-97508 is a high-severity vulnerability in Linux, published on 24 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:
thunderbolt: Set tb->root_switch to NULL when domain is stopped
Similarly what we do with the firmware connection manager. This makes tb_xdp_handle_request() return error to the remote host. However, we need to make sure we keep the uuid alive so that we can reply until the whole domain is released.
Which versions are affected by CVE-2026-97508?
How do I fix CVE-2026-97508?
Apply the vendor's patch.
Is CVE-2026-97508 being exploited?
There is no known exploitation of CVE-2026-97508 in the wild and no public exploit code.
Sources
Also known as AZL-103910, BELL-CVE-2026-97508, DEBIAN-CVE-2026-97508, GHSA-93h6-v44h-45xx, UBUNTU-CVE-2026-97508.