CVE-2026-43454 netfilter: nf_tables: Fix for duplicate device in netdev hooks
A logic error in Linux kernel netfilter allows duplicate device registration in netdev hooks, potentially causing state inconsistencies.
- 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-2026-43454?
CVE-2026-43454 is a high-severity vulnerability in Linux kernel, published on 8 May 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:
netfilter: nf_tables: Fix for duplicate device in netdev hooks
When handling NETDEV_REGISTER notification, duplicate device registration must be avoided since the device may have been added by nft_netdev_hook_alloc() already when creating the hook.
Which versions are affected by CVE-2026-43454?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43454?
Apply the vendor's patch.
Is CVE-2026-43454 being exploited?
There is no known exploitation of CVE-2026-43454 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43454, DEBIAN-CVE-2026-43454, GHSA-f5mr-9pc2-5mcw, UBUNTU-CVE-2026-43454.