CVE-2026-80645 rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()
A null pointer dereference in the tsi721 RapidIO driver can cause a kernel crash, requiring a patch to fix the loop logic.
- 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-2026-80645?
CVE-2026-80645 is a high-severity vulnerability in Linux, published on 28 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:
rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()
With a list_for_each() loop, if we don't find the item we are looking for in the list, then the loop exits with the iterator, which is "dbell" in this loop, pointing to invalid memory.
This code uses the "found" variable to determine if we have found the doorbell we are looking for or not. However, the problem that the "found" variable needs to be set to false at the start of each iteration, otherwise after the first correct doorbell, then everything is marked as found.
Reset the "found" to false at the start of the iteration and move the variable inside the loop.
Which versions are affected by CVE-2026-80645?
How do I fix CVE-2026-80645?
Apply the vendor's patch.
Is CVE-2026-80645 being exploited?
There is no known exploitation of CVE-2026-80645 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80645, DEBIAN-CVE-2026-80645, GHSA-fmq3-pjfg-pm48, UBUNTU-CVE-2026-80645.