CVE-2026-90336

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/5e260edd28eddc3b92c9f578df3026fd11c710cf
• https://git.kernel.org/stable/c/61a2fb25551be0375bc16ef2a70c987dfca26183
• https://git.kernel.org/stable/c/802e2192a9d38027730c2869c67c9131b8c8fe9f
• https://git.kernel.org/stable/c/a9c0ffe5930c97b352f32febfc59a6e6ae6772ee
• https://git.kernel.org/stable/c/ddf51d74ee9f9857c99477329d80408cedebda61