published September 17, 2026
In the Linux kernel, the following vulnerability has been resolved:
i3c: master: Fix use-after-free of master->this
sysfs attribute callbacks for the master controller device dereference
master->this. However, master->this is freed in
i3c_master_detach_free_devs() before the master device itself is
released.
As a result, sysfs accesses can dereference a freed master->this
pointer, leading to a use-after-free.
Keep master->this alive until i3c_masterdev_release(), which is called
after the master device and its sysfs state are being torn down. Do not
free master->this as part of the normal device detach path.
On the error path in i3c_master_set_info(), reset master->this and
bus.cur_master to NULL before freeing the allocated device.