CVE-2024-26723 lan966x: Fix crash when adding interface under a lag
A null pointer dereference in the lan966x driver causes a kernel crash when adding an interface to a LAG, 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-2024-26723?
CVE-2024-26723 is a high-severity vulnerability in Linux kernel, published on 3 Apr 2024. 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:
lan966x: Fix crash when adding interface under a lag
There is a crash when adding one of the lan966x interfaces under a lag interface. The issue can be reproduced like this: ip link add name bond0 type bond miimon 100 mode balance-xor ip link set dev eth0 master bond0
The reason is because when adding a interface under the lag it would go through all the ports and try to figure out which other ports are under that lag interface. And the issue is that lan966x can have ports that are NULL pointer as they are not probed. So then iterating over these ports it would just crash as they are NULL pointers. The fix consists in actually checking for NULL pointers before accessing something from the ports. Like we do in other places.
Weakness: CWE-400
Which versions are affected by CVE-2024-26723?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-26723?
Apply the vendor's patch.
Is CVE-2024-26723 being exploited?
There is no known exploitation of CVE-2024-26723 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-26723, DEBIAN-CVE-2024-26723, GHSA-68q2-g7rv-mr2f, UBUNTU-CVE-2024-26723.