CVE-2023-54240 net: ethernet: mtk_eth_soc: fix possible NULL pointer dereference in mtk_hwlro_get_fdir_all()
A local attacker can cause a denial of service in the Linux kernel via a NULL pointer dereference in the MediaTek Ethernet driver.
- 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-2023-54240?
CVE-2023-54240 is a vulnerability in Linux, published on 30 Dec 2025. 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: ethernet: mtk_eth_soc: fix possible NULL pointer dereference in mtk_hwlro_get_fdir_all()
rule_locs is allocated in ethtool_get_rxnfc and the size is determined by rule_cnt from user space. So rule_cnt needs to be check before using rule_locs to avoid NULL pointer dereference.
Which versions are affected by CVE-2023-54240?
How do I fix CVE-2023-54240?
Apply the vendor's patch.
Is CVE-2023-54240 being exploited?
There is no known exploitation of CVE-2023-54240 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-54240, DEBIAN-CVE-2023-54240, GHSA-74c5-8qvv-vrf8, UBUNTU-CVE-2023-54240.