# CVE-2026-31620

> Vulnerability · severity: **MEDIUM** (CVSS 4.6).

## Description

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usx2y: us144mkii: fix NULL deref on missing interface 0

A malicious USB device with the TASCAM US-144MKII device id can have a
configuration containing bInterfaceNumber=1 but no interface 0.  USB
configuration descriptors are not required to assign interface numbers
sequentially, so usb_ifnum_to_if(dev, 0) returns will NULL, which will
then be dereferenced directly.

Fix this up by checking the return value properly.

## Key facts

- **CVE ID:** CVE-2026-31620
- **Published:** 2026-04-24
- **CVSS severity:** MEDIUM
- **CVSS base score:** 4.6
- **CWE codes:** CWE-476

## Affected products

- `linux:linux_kernel`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31620

## Citation

> AI Analytics. CVE-2026-31620. Retrieved 2026-08-08 from https://api.ai-analytics.org/cve/CVE-2026-31620. Derived from NIST NVD. Licensed CC0.

---

*[Dataset catalog](https://api.ai-analytics.org/datasets/) · [AI Analytics](https://api.ai-analytics.org/) · CC0 1.0*