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.

Classification

CVE ID: CVE-2025-22027

Affected Products

Vendor: Linux

Product: Linux, Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 5.04% (scored less or equal to compared to others)

EPSS Date: 2025-04-20 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-22027
https://git.kernel.org/stable/c/30ef7cfee752ca318d5902cb67b60d9797ccd378
https://git.kernel.org/stable/c/15483afb930fc2f883702dc96f80efbe4055235e
https://git.kernel.org/stable/c/adf0ddb914c9e5b3e50da4c97959e82de2df75c3
https://git.kernel.org/stable/c/4db62b60af2ccdea6ac5452fd20e29587ed85f57
https://git.kernel.org/stable/c/8760da4b9d44c36b93b6e4cf401ec7fe520015bd
https://git.kernel.org/stable/c/f656cfbc7a293a039d6a0c7100e1c846845148c1

Timeline