CVE-2024-49874 Information

Description

In the Linux kernel the following vulnerability has been resolved:

i3c: master: svc: Fix use after free vulnerability in svc_i3c_master Driver Due to Race Condition

In the svc_i3c_master_probe function &master->hj_work is bound with svc_i3c_master_hj_work &master->ibi_work is bound with svc_i3c_master_ibi_work. And svc_i3c_master_ibi_work can start the hj_work svc_i3c_master_irq_handler can start the ibi_work.

If we remove the module which will call svc_i3c_master_remove to make cleanup it will free master->base through i3c_master_unregister while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows:

CPU0 CPU1

                                | svc_i3c_master_hj_work

svc_i3c_master_remove | i3c_master_unregister(&master->base)| device_unregister(&master->dev) | device_release | //free master->base | | i3c_master_do_daa(&master->base) | //use master->base

Fix it by ensuring that the work is canceled before proceeding with the cleanup in svc_i3c_master_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/4ac637122930cc4ab7e2c22e364cf3aaf96b05b1 https://git.kernel.org/stable/c/4318998892bf8fe99f97bea18c37ae7b685af75a https://git.kernel.org/stable/c/27b55724d3f781dd6e635e89dc6e2fd78fa81a00 https://git.kernel.org/stable/c/61850725779709369c7e907ae8c7c75dc7cec4f3

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