CVE-2026-93109 RDMA/mlx5: Drain RCU callbacks during module teardown
A race condition in the Linux kernel RDMA mlx5 driver during module teardown can cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93109?
CVE-2026-93109 is a vulnerability in Linux, published on 17 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:
RDMA/mlx5: Drain RCU callbacks during module teardown
devx_free_subscription() can remain queued after the last DevX event file drops its module reference or an auxiliary driver detaches its devices. mlx5_ib can then unload before the callback runs.
Registration error unwind has the same risk because driver registration can attach existing devices before failing. Wait after all drivers have stopped.
Which versions are affected by CVE-2026-93109?
How do I fix CVE-2026-93109?
Apply the vendor's patch.
Is CVE-2026-93109 being exploited?
There is no known exploitation of CVE-2026-93109 in the wild and no public exploit code.
Sources
Also known as AZL-101882, BELL-CVE-2026-93109, DEBIAN-CVE-2026-93109, GHSA-583f-vmr6-5jpr, UBUNTU-CVE-2026-93109.