CVE-2026-31755 usb: cdns3: gadget: fix NULL pointer dereference in ep_queue

What is CVE-2026-31755?

CVE-2026-31755 is a medium-severity vulnerability in Linux kernel, published on 1 May 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: cdns3: gadget: fix NULL pointer dereference in ep_queue

When the gadget endpoint is disabled or not yet configured, the ep->desc pointer can be NULL. This leads to a NULL pointer dereference when __cdns3_gadget_ep_queue() is called, causing a kernel crash.

Add a check to return -ESHUTDOWN if ep->desc is NULL, which is the standard return code for unconfigured endpoints.

This prevents potential crashes when ep_queue is called on endpoints that are not ready.

Weakness: CWE-476

Which versions are affected by CVE-2026-31755?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-31755?

Apply the vendor's patch.

Is CVE-2026-31755 being exploited?

There is no known exploitation of CVE-2026-31755 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 BELL-CVE-2026-31755, DEBIAN-CVE-2026-31755, GHSA-5r68-rpxc-f6cw, ROOT-OS-DEBIAN-11-CVE-2026-31755, ROOT-OS-UBUNTU-2204-CVE-2026-31755, ROOT-OS-UBUNTU-2404-CVE-2026-31755 and 1 more.