CVE-2026-98750: tty: fix saved termios reset race
In the Linux kernel, the following vulnerability has been resolved:
tty: fix saved termios reset race
Resetting saved termios state on device registration is needed where a minor number can be reused for an entirely different device and where the old settings may prevent the port from even being opened (e.g. when CLOCAL is not set).
Not all TTY drivers guarantee that the minor number is no longer in use when registering devices however, something which can lead to a use-after-free when closing a TTY (and saving its termios) races with re-registration.
Add a new TTYDRIVERRESETSAVEDTERMIOS flag to request that any saved termios state is reset on registration and only set it for drivers that make sure that the minor number is no longer in use.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Set the TTY_DRIVER_RESET_SAVED_TERMIOS flag for drivers where a minor number can be reused for an entirely different device, so saved termios state is reset on device registration.
Linux TTY driver TTY_DRIVER_RESET_SAVED_TERMIOS = enabled