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)…
Does this matter?
Lower severity and a low EPSS score (0.10%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.10% probability · 1th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-667
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7bPatch
- https://git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0dbPatch
- https://git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdfPatch
- https://git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483Patch
- https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207Patch
- https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17Patch
- https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395Patch
- https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.