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

tty: tty port: restore TTY IO ERROR on activation failure

Make sure to restore the TTY IO ERROR flag if activation fails to prevent I/O attempts on a port that is gone or powered down.

This specifically avoids issues like kernel panic due to unclocked accesses or NULL-pointer dereferences when accessing powered down or deregistered ports when a TTY ioctl races with hangup and open.

Note that the flag is set again in tty port close() but not restoring it on activation failure leaves a window where drivers fail to handle the ioctl-hangup race.