CVE-2025-22027 media: streamzap: fix race between device disconnection and urb callback
A race condition in the Linux kernel streamzap driver causes a NULL pointer dereference and system crash during device disconnection.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-22027?
CVE-2025-22027 is a medium-severity vulnerability in Linux kernel, published on 16 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2025-22027?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-22027?
Apply the vendor's patch.
Is CVE-2025-22027 being exploited?
There is no known exploitation of CVE-2025-22027 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-22027, DEBIAN-CVE-2025-22027, GHSA-jv3r-47pw-5225, ROOT-OS-UBUNTU-2204-CVE-2025-22027, ROOT-OS-UBUNTU-2404-CVE-2025-22027, UBUNTU-CVE-2025-22027.