CVE-2025-22027

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References