CVE-2026-80667 net/mlx5: LAG, MPESW, Fix missing complete() on devcom error
A missing completion call in the mlx5 MPESW driver causes indefinite blocking, leading to a local denial of service.
- 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-2026-80667?
CVE-2026-80667 is a denial of service 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:
net/mlx5: LAG, MPESW, Fix missing complete() on devcom error
mlx5_mpesw_work() returned without calling complete() when mlx5_lag_get_devcom_comp() returned NULL. A caller that queued the work and waited on mpesww->comp would block indefinitely.
Funnel the early-return path through a new "complete" label so the waiter is always woken.
Which versions are affected by CVE-2026-80667?
How do I fix CVE-2026-80667?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-80667 being exploited?
There is no known exploitation of CVE-2026-80667 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80667, DEBIAN-CVE-2026-80667, GHSA-22gp-wwxc-hrmc, UBUNTU-CVE-2026-80667.