What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-01 · updated 2026-07-04
• Weakness: CWE-476

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.

Affected products

• Linux kernel: from 5.4 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12 — fixed in 5.15.203, 6.1.168, 6.12.81, 6.18.22, 6.19.12, 6.6.134

How to fix

Upgrade to a fixed version: Linux kernel 5.15.203, 6.1.168, 6.12.81, 6.18.22. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/14bf08ab2cdfcdfd3f13e799d06692a1b3e0745f
• https://git.kernel.org/stable/c/390536cc6af4ca5566bc3bf1f8b704700380cd2c
• https://git.kernel.org/stable/c/3cf0580a09d417eab41ce914a11f9cde3a121871
• https://git.kernel.org/stable/c/3d1433fe34b224b90259e207e5389e95b504ef04
• https://git.kernel.org/stable/c/7f6f127b9bc34bed35f56faf7ecb1561d6b39000
• https://git.kernel.org/stable/c/9ab9b0e5fcdac325f950fc8b6caa08a9e22a0db9
• https://git.kernel.org/stable/c/d61446dfc9d387775bb1b95b081953201b9222af
• https://git.kernel.org/stable/c/fb2ad0c1334a3eccfe4ed203f9eef5a4879226f6

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