---
id: CVE-2026-31620
title: 'ALSA: usx2y: us144mkii: fix NULL deref on missing interface 0'
summary: |-
  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 bInterfac…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= dee1bcf28a3dd13ddb2e9200407864f73e9c4d63 <
    09b145c1f1331c40dc955c0024d636f25417cddb
  - >-
    Linux >= dee1bcf28a3dd13ddb2e9200407864f73e9c4d63 <
    fbaf29ce00e7bce683f3faf4f2b326bd0a9e6602
  - >-
    Linux >= dee1bcf28a3dd13ddb2e9200407864f73e9c4d63 <
    d04dd67ab10dc978c6c843c6bd6a2a66a9444f51
  - >-
    Linux >= dee1bcf28a3dd13ddb2e9200407864f73e9c4d63 <
    48bd344e1040b9f2eb512be73c13f5db83efc191
  - Linux 6.18
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:22:50.866253Z'
published: '2026-04-24'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:32:19.973Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-31620'
references:
  - url: 'https://git.kernel.org/stable/c/09b145c1f1331c40dc955c0024d636f25417cddb'
  - url: 'https://git.kernel.org/stable/c/fbaf29ce00e7bce683f3faf4f2b326bd0a9e6602'
  - url: 'https://git.kernel.org/stable/c/d04dd67ab10dc978c6c843c6bd6a2a66a9444f51'
  - url: 'https://git.kernel.org/stable/c/48bd344e1040b9f2eb512be73c13f5db83efc191'
tags:
  - cve.org
epss: 0.00196
epssPercentile: 0.09396
ingestedAt: '2026-11-06T15:54:04.054Z'
---

## Overview

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.

## Affected

- `Linux >= dee1bcf28a3dd13ddb2e9200407864f73e9c4d63 < 09b145c1f1331c40dc955c0024d636f25417cddb`
- `Linux >= dee1bcf28a3dd13ddb2e9200407864f73e9c4d63 < fbaf29ce00e7bce683f3faf4f2b326bd0a9e6602`
- `Linux >= dee1bcf28a3dd13ddb2e9200407864f73e9c4d63 < d04dd67ab10dc978c6c843c6bd6a2a66a9444f51`
- `Linux >= dee1bcf28a3dd13ddb2e9200407864f73e9c4d63 < 48bd344e1040b9f2eb512be73c13f5db83efc191`
- `Linux 6.18`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.