CVE-2026-72109 net: sparx5: unregister blocking notifier on init failure
A resource leak in the Sparx5 network driver occurs if workqueue allocation fails, potentially leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72109?
CVE-2026-72109 is a high-severity 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:
net: sparx5: unregister blocking notifier on init failure
sparx5_register_notifier_blocks() registers the switchdev blocking notifier before allocating the ordered workqueue. If the workqueue allocation fails, the error path unregisters the switchdev and netdevice notifiers, but leaves the blocking notifier registered.
Add a separate error label for the workqueue allocation failure path and unregister the switchdev blocking notifier there.
Which versions are affected by CVE-2026-72109?
How do I fix CVE-2026-72109?
Apply the vendor's patch.
Is CVE-2026-72109 being exploited?
There is no known exploitation of CVE-2026-72109 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72109, DEBIAN-CVE-2026-72109, GHSA-m3g3-ff8f-v2gj, UBUNTU-CVE-2026-72109.