CVE-2026-64338 USB: misc: uss720: unregister parport on probe failure
A use-after-free vulnerability in the uss720 USB printer driver allows local attackers to cause denial of service or potentially escalate privileges via a probe failure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64338?
CVE-2026-64338 is a medium-severity use after free vulnerability in Linux kernel, published on 25 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-64338?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64338?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-64338 being exploited?
There is no known exploitation of CVE-2026-64338 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64338, DEBIAN-CVE-2026-64338, GHSA-pghr-8xhx-xv5x, ROOT-OS-UBUNTU-2204-CVE-2026-64338, UBUNTU-CVE-2026-64338.