CVE-2026-98772

/// Technical description

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

USB: serial: fix port tear down use-after-free

Some drivers for multiport devices access port driver data from

completion handlers of shared URBs submitted at attach() or first open()

and stopped at disconnect() or last close(), respectively.

A simple NULL check before accessing the driver data makes sure that a

port state container has at least been allocated, but a completion

handler can still race with port tear down.

Reorder the disconnect handling so that ports are not deregistered (and

their driver data freed) until after all ports have been hung up and the

driver disconnect() callback has run so that all I/O has been stopped.

/// 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