CVE-2026-31576

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

media: hackrf: fix to not free memory after the device is registered in hackrf_probe()

In hackrf driver, the following race condition occurs:

```

CPU0 CPU1

hackrf_probe()

kzalloc(); // alloc hackrf_dev

....

v4l2_device_register();

....

fd = sys_open("/path/to/dev"); // open hackrf fd

....

v4l2_device_unregister();

....

kfree(); // free hackrf_dev

....

sys_ioctl(fd, ...);

v4l2_ioctl();

video_is_registered() // UAF!!

....

sys_close(fd);

v4l2_release() // UAF!!

hackrf_video_release()

kfree(); // DFB!!

```

When a V4L2 or video device is unregistered, the device node is removed so

new open() calls are blocked.

However, file descriptors that are already open-and any in-flight I/O-do

not terminate immediately; they remain valid until the last reference is

dropped and the driver's release() is invoked.

Therefore, freeing d

/// 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