CVE-2026-98752

In the Linux kernel, the following vulnerability has been resolved: tty: port: fix tty_port_tty_vhangup() race Drivers rely on tty_port_tty_vhangup() to synchronously hang up their ports before tearing down resources as part of deregistration (e.g. on physical disconnect). If tty_port_tty_vhangup() races with another hangup it may however return before the port has been shut down. This is in turn can lead to use-after-free and NULL-pointer dereferences in racing ioctls (including a synchronous hangup) and in processing of racing asynchronous hangups (carrier loss). Add the missing serialisation to tty_port_tty_vhangup() and tty_port_hangup() so that the former does not return until the port has been shut down also when there is a racing hangup. Note that serial core does not use tty_port_hangup(), but it already holds the port mutex when clearing port->tty and shutting down the port in uart_hangup().

• https://git.kernel.org/stable/c/017b18addbe8dcace1a569a00d40ed1ba1e03f4c
• https://git.kernel.org/stable/c/6b7be3b9b857947e9c1338d4919d4ebd3b75e907
• https://git.kernel.org/stable/c/6d1a984afc3ca477dab3e51ec806671d443ad524
• https://git.kernel.org/stable/c/b48820de8c1a596c5b99775524dfce73c6576c5d