CVE-2024-50059

/// Technical description

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

ntb: ntb_hw_switchtec: Fix use after free vulnerability in switchtec_ntb_remove due to race condition

In the switchtec_ntb_add function, it can call switchtec_ntb_init_sndev

function, then &sndev->check_link_status_work is bound with

check_link_status_work. switchtec_ntb_link_notification may be called

to start the work.

If we remove the module which will call switchtec_ntb_remove to make

cleanup, it will free sndev through kfree(sndev), while the work

mentioned above will be used. The sequence of operations that may lead

to a UAF bug is as follows:

CPU0 CPU1

| check_link_status_work

switchtec_ntb_remove |

kfree(sndev); |

| if (sndev->link_force_down)

| // use sndev

Fix it by ensuring that the work is canceled before proceeding with

the cleanup in switchtec_ntb_remove.

/// 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