CVE-2026-72058

Technical Description

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

net: ixp4xx_hss: fix duplicate HDLC netdev allocation

ixp4xx_hss_probe() allocates two HDLC netdevs. The first one is stored

in ndev, initialized, and registered with register_hdlc_device(). The

second one is stored in port->netdev and later used by the remove path

for unregister_hdlc_device() and free_netdev().

This means that the registered netdev is not the same object that is

unregistered and freed on remove. It also leaks the first allocation if

the second alloc_hdlcdev() call fails, and the first allocation is not

checked before ndev is used.

Older code allocated the HDLC netdev only once and stored the same object

in both the local variable and port->netdev. The buggy conversion split

this into two alloc_hdlcdev() calls. A later rename changed the local

variable name to ndev, but the underlying mismatch remained.

Fix this by allocating the HDLC netdev only once and assigning the same

object to port->netdev.

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