CVE-2026-43219 net: cpsw_new: Fix potential unregister of netdev that has not been registered yet
A logic error in the Linux kernel CPSW driver could cause a null pointer dereference and system crash if network device registration fails.
- 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-2026-43219?
CVE-2026-43219 is a medium-severity vulnerability in Linux kernel, published on 6 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:
net: cpsw_new: Fix potential unregister of netdev that has not been registered yet
If an error occurs during register_netdev() for the first MAC in cpsw_register_ports(), even though cpsw->slaves[0].ndev is set to NULL, cpsw->slaves[1].ndev would remain unchanged. This could later cause cpsw_unregister_ports() to attempt unregistering the second MAC. To address this, add a check for ndev->reg_state before calling unregister_netdev(). With this change, setting cpsw->slaves[i].ndev to NULL becomes unnecessary and can be removed accordingly.
Which versions are affected by CVE-2026-43219?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43219?
Apply the vendor's patch.
Is CVE-2026-43219 being exploited?
There is no known exploitation of CVE-2026-43219 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43219, DEBIAN-CVE-2026-43219, GHSA-86c9-4w26-qf4c, ROOT-OS-DEBIAN-11-CVE-2026-43219, ROOT-OS-DEBIAN-12-CVE-2026-43219, ROOT-OS-DEBIAN-13-CVE-2026-43219 and 3 more.