CVE-2026-90336

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/06b376432974fe5f25f2843a8e8438c6a1cf3d50
• https://git.kernel.org/stable/c/61a2fb25551be0375bc16ef2a70c987dfca26183

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