CVE-2026-64333 USB: serial: digi_acceleport: fix write buffer corruption

High 7.8 Published 25 Jul 2026 Updated 19 Oct 2026

A memory corruption vulnerability in the Linux kernel's digi_acceleport USB driver allows attackers to corrupt write buffers, potentially leading to code execution or system crashes.

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-2026-64333?

CVE-2026-64333 is a high-severity memory corruption 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: serial: digi_acceleport: fix write buffer corruption

The digi_write_inb_command() is supposed to wait for the write urb to become available or return an error, but instead it updates the transfer buffer and tries to resubmit the urb on timeout.

To make things worse, for commands like break control where no timeout is used, the driver would corrupt the urb immediately due to a broken jiffies comparison (on 32-bit machines this takes five minutes of uptime to trigger due to INITIAL_JIFFIES).

Fix this by adding the missing return on timeout and waiting indefinitely when no timeout has been specified as intended.

This issue was (sort of) flagged by Sashiko when reviewing an unrelated change to the driver.

Weakness: CWE-787

Which versions are affected by CVE-2026-64333?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64333?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-64333 being exploited?

There is no known exploitation of CVE-2026-64333 in the wild and no public exploit code.

All Linux kernel vulnerabilities

Sources

Also known as BELL-CVE-2026-64333, DEBIAN-CVE-2026-64333, GHSA-92hp-m55f-9hjw, ROOT-OS-DEBIAN-12-CVE-2026-64333, ROOT-OS-UBUNTU-2204-CVE-2026-64333, UBUNTU-CVE-2026-64333.