CVE-2026-98695

/// Technical description

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

USB: serial: fix ioctl hangup race

The tty ioctls can race with hangup and end up calling into a tty driver

for a device that is already gone or powered down.

Serialise the callbacks using the tty port mutex and add the missing

checks to make sure the port has not been hung up before accessing port

driver data or hardware.

This specifically avoids dereferencing a NULL-pointer if a device is

disconnected during lengthy break signalling.

Note that TIOCGICOUNT and TIOCMIWAIT do not access port driver data or

hardware and are therefore not affected by the race.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References