CVE-2024-50023

Technical 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 unregistere

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References