CVE-2026-53384

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

serial: 8250dw: unregister 8250 port if clknotifier_register() fails

dw8250probe() registers the 8250 port via serial8250register8250port()

and then, if the device has a clock, registers a clock notifier. If

clknotifierregister() fails, probe returns the error but leaves the

8250 port registered. The matching serial8250unregisterport() lives

in dw8250_remove(), which is not called when probe fails, so the port

slot stays occupied until the device is rebound or the system is

rebooted. The devm-allocated driver data is freed while the port still

references it (via the saved privatedata and serialin/serial_out

callbacks), so any access to that port slot before a rebind is a

use-after-free hazard.

Unregister the port on the clknotifierregister() error path.