CVE-2026-31620 ALSA: usx2y: us144mkii: fix NULL deref on missing interface 0

What is CVE-2026-31620?

CVE-2026-31620 is a medium-severity vulnerability in Linux kernel, published on 24 Apr 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:

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.

Weakness: CWE-476

Which versions are affected by CVE-2026-31620?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-31620?

Apply the vendor's patch.

Is CVE-2026-31620 being exploited?

There is no known exploitation of CVE-2026-31620 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-83645, BELL-CVE-2026-31620, DEBIAN-CVE-2026-31620, GHSA-jg3h-4jh8-mfwr, ROOT-OS-DEBIAN-11-CVE-2026-31620, ROOT-OS-DEBIAN-12-CVE-2026-31620 and 2 more.