CVE-2025-22027

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.

Weakness

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected Software

Extended Description

A race condition occurs within concurrent environments, and it is effectively a property of a code sequence. Depending on the context, a code sequence may be in the form of a function call, a small number of instructions, a series of program invocations, etc. A race condition violates these properties, which are closely related:

A race condition exists when an “interfering code sequence” can still access the shared resource, violating exclusivity. The interfering code sequence could be “trusted” or “untrusted.” A trusted interfering code sequence occurs within the product; it cannot be modified by the attacker, and it can only be invoked indirectly. An untrusted interfering code sequence can be authored directly by the attacker, and typically it is external to the vulnerable product.

Potential Mitigations

• Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring.
• Additionally, this will minimize the amount of synchronization necessary and may even help to reduce the likelihood of a denial of service where an attacker may be able to repeatedly trigger a critical section (CWE-400).

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/26.html
• https://cwe.mitre.org/data/definitions/29.html

References

• 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/e11652a6514ec805440c1bb3739e6c6236fffcc7
• https://git.kernel.org/stable/c/f1d518c0bad01abe83c2df880274cb6a39f4a457
• https://git.kernel.org/stable/c/f656cfbc7a293a039d6a0c7100e1c846845148c1
• https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html