CVE-2024-50059 Information

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.

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://git.kernel.org/stable/c/b650189687822b705711f0567a65a164a314d8df https://git.kernel.org/stable/c/92728fceefdaa2a0a3aae675f86193b006eeaa43 https://git.kernel.org/stable/c/3ae45be8492460a35b5aebf6acac1f1d32708946 https://git.kernel.org/stable/c/fa840ba4bd9f3bad7f104e5b32028ee73af8b3dd https://git.kernel.org/stable/c/177925d9c8715a897bb79eca62628862213ba956 https://git.kernel.org/stable/c/e51aded92d42784313ba16c12f4f88cc4f973bbb

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.0