CVE-2026-64335 USB: serial: digi_acceleport: fix broken rx after throttle
A flaw in the Linux kernel's digi_acceleport USB driver causes data reception to stop permanently after a specific port closure sequence, requiring device reconnection.
- 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-2026-64335?
CVE-2026-64335 is a medium-severity denial of service 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 broken rx after throttle
If the port is closed while throttled, the read urb is never resubmitted and the port will not receive any further data until the device is reconnected (or the driver is rebound).
Clear the throttle flags and submit the urb if needed when opening the port.
Which versions are affected by CVE-2026-64335?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64335?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-64335 being exploited?
There is no known exploitation of CVE-2026-64335 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64335, DEBIAN-CVE-2026-64335, GHSA-pfpg-cf3x-8p3v, ROOT-OS-UBUNTU-2204-CVE-2026-64335, UBUNTU-CVE-2026-64335.