CVE-2023-54012

Technical Description

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

net: fix stack overflow when LRO is disabled for virtual interfaces

When the virtual interface's feature is updated, it synchronizes the

updated feature for its own lower interface.

This propagation logic should be worked as the iteration, not recursively.

But it works recursively due to the netdev notification unexpectedly.

This problem occurs when it disables LRO only for the team and bonding

interface type.

team0

|

+------+------+-----+-----+

| | | | |

team1 team2 team3 ... team200

If team0's LRO feature is updated, it generates the NETDEV_FEAT_CHANGE

event to its own lower interfaces(team1 ~ team200).

It is worked by netdev_sync_lower_features().

So, the NETDEV_FEAT_CHANGE notification logic of each lower interface

work iteratively.

But generated NETDEV_FEAT_CHANGE event is also sent to the upper

interface too.

upper interface(team0) generates the NETDEV_FEAT_CHANGE eve

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