CVE-2026-90336
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
serial: core: clear freed pointers on uart_register_driver() failure
uart_register_driver() leaves drv->state pointing to freed memory when
tty_alloc_driver() fails. If tty_register_driver() fails, drv->tty_driver
also retains a pointer after its reference is dropped.
Drivers that use drv->state as an 'already registered' flag can then skip
registration on the next probe and pass the freed state to
uart_add_one_port().
This issue was found with failslab on QEMU's raspi1ap board by
failing registration and binding the PL011 port again.
Clear both pointers on their failure paths, as uart_unregister_driver()
already does.
https://git.kernel.org/stable/c/06b376432974fe5f25f2843a8e8438c6a1cf3d50
https://git.kernel.org/stable/c/61a2fb25551be0375bc16ef2a70c987dfca26183