CVE-2024-50023 net: phy: Remove LED entry from LEDs list on unregister
A missing list removal in the Linux kernel PHY LED driver causes a kernel panic when a network port is toggled after module reload.
- 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-2024-50023?
CVE-2024-50023 is a medium-severity vulnerability in Linux kernel, published on 21 Oct 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:
net: phy: Remove LED entry from LEDs list on unregister
Commit c938ab4da0eb ("net: phy: Manual remove LEDs to ensure correct ordering") correctly fixed a problem with using devm_ but missed removing the LED entry from the LEDs list.
This cause kernel panic on specific scenario where the port for the PHY is torn down and up and the kmod for the PHY is removed.
On setting the port down the first time, the assosiacted LEDs are correctly unregistered. The associated kmod for the PHY is now removed. The kmod is now added again and the port is now put up, the associated LED are registered again. On putting the port down again for the second time after these step, the LED list now have 4 elements. With the first 2 already unregistered previously and the 2 new one registered again.
This cause a kernel panic as the first 2 element should have been removed.
Fix this by correctly removing the element when LED is unregistered.
Which versions are affected by CVE-2024-50023?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-50023?
Apply the vendor's patch.
Is CVE-2024-50023 being exploited?
There is no known exploitation of CVE-2024-50023 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-51533, BELL-CVE-2024-50023, DEBIAN-CVE-2024-50023, GHSA-vxq8-9rpj-hgjg, UBUNTU-CVE-2024-50023.