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

vt: stabilize tty reference in kbd_keycode with tty_port_tty_get

kbd_keycode() reads vc->port.tty without acquiring a tty reference,
racing against con_shutdown() which clears port.tty under a different
lock. Use tty_port_tty_get()/tty_kref_put() to hold a proper reference
for the duration the tty pointer is needed.

https://git.kernel.org/stable/c/38400673c9bfb39cfc87539e1a072087e98f4e4f

https://git.kernel.org/stable/c/38a0aa593ebc275aea6f79534d07f44e43768ce6

https://git.kernel.org/stable/c/3f6b1d3fcfc26dc3fc85262f753439df93b055b4

https://git.kernel.org/stable/c/b664592e9ba8c47c9e23408db7ba52eb9f946c8a

https://git.kernel.org/stable/c/b84fd400f80adf4d1c88fbce50ae1cf2f8119e65

https://git.kernel.org/stable/c/cab5a342f0589334046741006d8a280514f94235

https://git.kernel.org/stable/c/cc4a1a2ce0c58eafd477effb055863935260ddc1

https://git.kernel.org/stable/c/e25d47a526939ad44b75f778b8a7500562b84fc1

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