CVE-2024-49874: i3c: master: svc: Fix use after free vulnerability in svc_i3c_master Driver Due to Race Condition
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.
Classification
CVE ID: CVE-2024-49874
Affected Products
Vendor: Linux
Product: Linux
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 5.08% (scored less or equal to compared to others)
EPSS Date: 2025-02-04 (when was this score calculated)
References
https://git.kernel.org/stable/c/56bddf543d4d7ddeff3f87b554ddacfdf086bffehttps://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