CVE-2023-54270

A use-after-free vulnerability was found in the Linux kernel's Siano USB driver for digital TV receivers. In do_submit_urb(), memory allocated during smsusb_probe() can be freed by smsusb_term_device() while URB work items are still referencing it. This leads to a use-after-free condition when worker threads access the freed memory.

Exploiting this flaw requires physical access to connect a malicious or malfunctioning Siano USB device. The UAF occurs during device probing, which is controlled by physical device insertion. While UAF bugs can be severe, the physical access requirement substantially reduces the attack surface.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the smsusb module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.