CVE-2026-64338: USB: misc: uss720: unregister parport on probe failure

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-25 · updated 2026-09-03

Description

In the Linux kernel, the following vulnerability has been resolved: USB: misc: uss720: unregister parport on probe failure uss720_probe() registers a parport before reading the 1284 register used to detect unsupported Belkin F5U002 adapters. If get_1284_register() fails, the error path drops the driver private data and the USB device reference, but leaves the parport device registered. Leaving the port registered is more than a private allocation leak: parport_register_port() has already reserved a parport number and registered the parport bus device, while pp->private_data still points at the private data that the common error path is about to release. Undo the pre-announce registration in the get_1284_register() failure branch before jumping to the common private-data cleanup path. Clear priv->pp first, matching the disconnect path and avoiding a stale pointer in the private data. This issue was identified during our ongoing static-analysis research while reviewing kernel code.

Affected products

Linux kernel: from 4.19.317 before 4.20; from 5.4.279 before 5.5; from 5.10.221 before 5.10.261; from 5.15.162 before 5.15.212; from 6.1.96 before 6.1.178; from 6.6.36 before 6.6.145 — fixed in 4.20, 5.10.261, 5.15.212, 5.5, 6.1.178, 6.12.96

How to fix

Upgrade to a fixed version: Linux kernel 4.20, 5.10.261, 5.15.212, 5.5. Check the vendor advisory for mitigations.

References

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