CVE-2026-64347: In the Linux kernel, the following vulnerability has been resolved: usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler The OTG b...

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler The OTG branch of composite_setup() falls back to the first configuration when none is selected: if (cdev->config) config = cdev->config; else config = list_first_entry(&cdev->configs, struct usb_configuration, list); if (!config) goto done; ... memcpy(req->buf, config->descriptors[0], value); list_first_entry() never returns NULL. On an empty list it returns container_of() of the list head. So the "if (!config)" check is dead. When cdev->configs is empty, config points at the head inside struct usb_composite_dev. config->descriptors[0] reads whatever sits at that offset. The memcpy copies up to w_length bytes of it into the response buffer. cdev->configs can be empty in two cases. One is a teardown race on gadget unbind with a control transfer in flight. The other is a driver that sets is_otg before it adds a config. A reproducer that holds cdev->configs empty triggers a KASAN fault in this branch. Use list_first_entry_or_null() so the existing check does its job.

Metrics

EPSS Probability

0.18%

7.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 53e6242db8d60da0587d36951cc9434d1a1c21dd, < 2454264b2ab4cf0055c0bfd39e79f830452bd0db; >= 53e6242db8d60da0587d36951cc9434d1a1c21dd, < d3e72cfef2e38bd588055739a8100d14f9773b17; >= 53e6242db8d60da0587d36951cc9434d1a1c21dd, < 8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483; >= 53e6242db8d60da0587d36951cc9434d1a1c21dd, < 56add2b9b2e89ec61c0761165d758f73004fdfdf; >= 53e6242db8d60da0587d36951cc9434d1a1c21dd, < 91b3ecd34b60f950c50c560974945b6596a6f207; >= 53e6242db8d60da0587d36951cc9434d1a1c21dd, < 01feaf024f29618d5ffa7ab0fd858e0579dcbf7b; >= 53e6242db8d60da0587d36951cc9434d1a1c21dd, < fcb21bf747640c9d6bd1eda9da85420f076d59c1; >= 53e6242db8d60da0587d36951cc9434d1a1c21dd, < f8f680609c2b3ab795ffcd6f21585b6dfc46d395
Linux	Linux	4.3

References

Timeline

Published: Jul 25, 2026
Last Modified: Aug 11, 2026
Status: Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64347?

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler The OTG branch of composite_setup() falls back to the first configuration when none is selected: if (cdev->config) config = cdev->config; else config = list_first_entry(&cdev->configs, struct usb_configuration, list); if (!config) goto done; ... memcpy(req->buf, config->descriptors[0], value); list_first_entry() never returns NULL. On an empty list it returns container_of() of the list head. So the "if (!config)" check is dead. When cdev->configs is empty, config points at the head inside struct usb_composite_dev. config->descriptors[0] reads whatever sits at that offset. The memcpy copies up to w_length bytes of it into the response buffer. cdev->configs can be empty in two cases. One is a teardown race on gadget unbind with a control transfer in flight. The other is a driver that sets is_otg before it adds a config. A reproducer that holds cdev->configs empty triggers a KASAN fault in this branch. Use list_first_entry_or_null() so the existing check does its job.

How severe is CVE-2026-64347?

Severity scoring for CVE-2026-64347 is pending analysis. The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2026-64347?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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