CVE-2024-38602

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

ax25: Fix reference count leak issues of ax25_dev

The ax25_addr_ax25dev() and ax25_dev_device_down() exist a reference

count leak issue of the object "ax25_dev".

Memory leak issue in ax25_addr_ax25dev():

The reference count of the object "ax25_dev" can be increased multiple

times in ax25_addr_ax25dev(). This will cause a memory leak.

Memory leak issues in ax25_dev_device_down():

The reference count of ax25_dev is set to 1 in ax25_dev_device_up() and

then increase the reference count when ax25_dev is added to ax25_dev_list.

As a result, the reference count of ax25_dev is 2. But when the device is

shutting down. The ax25_dev_device_down() drops the reference count once

or twice depending on if we goto unlock_put or not, which will cause

memory leak.

As for the issue of ax25_addr_ax25dev(), it is impossible for one pointer

to be on a list twice. So add a break in ax25_addr_ax25dev(). As for the

issue of ax25_dev_de

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

/// References