CVE-2026-93200

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/4f3145db05fede36b35f8249b8acde5bd5d54864
• https://git.kernel.org/stable/c/50034d8d0f797c3a7a599f750a7d3e792e80dea5
• https://git.kernel.org/stable/c/feb0ed76601f3c2f91f08688c5a7d8b9d382f720

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