CVE-2026-80594 Input: ims-pcu - fix potential infinite loop in CDC union descriptor parsing
A malicious USB device can cause an infinite loop in the Linux kernel ims-pcu driver, leading to a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-80594?
CVE-2026-80594 is a denial of service vulnerability in Linux, published on 28 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In the Linux kernel, the following vulnerability has been resolved:
Input: ims-pcu - fix potential infinite loop in CDC union descriptor parsing
The driver parses CDC union descriptors in ims_pcu_get_cdc_union_desc() by iterating through the extra descriptor data. However, it does not verify that the bLength of each descriptor is at least 2. A malicious device could provide a descriptor with bLength = 0, leading to an infinite loop in the driver.
Add a check to ensure bLength is at least 2 before proceeding with parsing.
Which versions are affected by CVE-2026-80594?
How do I fix CVE-2026-80594?
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-2026-80594 being exploited?
There is no known exploitation of CVE-2026-80594 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80594, DEBIAN-CVE-2026-80594, GHSA-3j49-838f-hr4g, UBUNTU-CVE-2026-80594.