CVE-2022-50542

Technical Description

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

media: si470x: Fix use-after-free in si470x_int_in_callback()

syzbot reported use-after-free in si470x_int_in_callback() [1]. This

indicates that urb->context, which contains struct si470x_device

object, is freed when si470x_int_in_callback() is called.

The cause of this issue is that si470x_int_in_callback() is called for

freed urb.

si470x_usb_driver_probe() calls si470x_start_usb(), which then calls

usb_submit_urb() and si470x_start(). If si470x_start_usb() fails,

si470x_usb_driver_probe() doesn't kill urb, but it just frees struct

si470x_device object, as depicted below:

si470x_usb_driver_probe()

...

si470x_start_usb()

...

usb_submit_urb()

retval = si470x_start()

return retval

if (retval < 0)

free struct si470x_device object, but don't kill urb

This patch fixes this issue by killing urb when si470x_start_usb()

fails and urb is submitted. If si470x_start_usb() fails and urb is

not s

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References