CVE-2025-22027 Information

Description

In the Linux kernel the following vulnerability has been resolved:

media: streamzap: fix race between device disconnection and urb callback

Syzkaller has reported a general protection fault at function ir_raw_event_store_with_filter(). This crash is caused by a NULL pointer dereference of dev->raw pointer even though it is checked for NULL in the same function which means there is a race condition. It occurs due to the incorrect order of actions in the streamzap_disconnect() function: rc_unregister_device() is called before usb_kill_urb(). The dev->raw pointer is freed and set to NULL in rc_unregister_device() and only after that usb_kill_urb() waits for in-progress requests to finish.

If rc_unregister_device() is called while streamzap_callback() handler is not finished this can lead to accessing freed resources. Thus rc_unregister_device() should be called after usb_kill_urb().

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Reference

https://git.kernel.org/stable/c/15483afb930fc2f883702dc96f80efbe4055235e https://git.kernel.org/stable/c/30ef7cfee752ca318d5902cb67b60d9797ccd378 https://git.kernel.org/stable/c/4db62b60af2ccdea6ac5452fd20e29587ed85f57 https://git.kernel.org/stable/c/8760da4b9d44c36b93b6e4cf401ec7fe520015bd https://git.kernel.org/stable/c/adf0ddb914c9e5b3e50da4c97959e82de2df75c3 https://git.kernel.org/stable/c/f656cfbc7a293a039d6a0c7100e1c846845148c1