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Change History

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: vhci: Prevent use-after-free by removing debugfs files early

Move the creation of debugfs files into a dedicated function, and ensure
they are explicitly removed during vhci_release(), before associated
data structures are freed.

Previously, debugfs files such as "force_suspend", "force_wakeup", and
others were created under hdev->debugfs but not removed in
vhci_release(). Since vhci_release() frees the backing vhci_data
structure, any access to these files after release would result in
use-after-free errors.

Although hdev->debugfs is later freed in hci_release_dev(), user can
access files after vhci_data is freed but before hdev->debugfs is
released.

https://git.kernel.org/stable/c/1503756fffe76d5aea2371a4b8dee20c3577bcfd

https://git.kernel.org/stable/c/28010791193a4503f054e8d69a950ef815deb539

https://git.kernel.org/stable/c/7cc08f2f127b9a66f46ea918e34353811a7cb378

https://git.kernel.org/stable/c/bd75eba88e88d7b896b0c737b02a74a12afc235f