CVE-2026-64347usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 53e6242db8d60da0587d36951cc9434d1a1c21dd before 2454264b2ab4cf0055c0bfd39e79f830452bd0db; from 53e6242db8d60da0587d36951cc9434d1a1c21dd before d3e72cfef2e38bd588055739a8100d14f9773b17; 53e6242db8d60da0587d36951cc9434d1a1c21dd builds before 8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483; from 53e6242db8d60da0587d36951cc9434d1a1c21dd before 56add2b9b2e89ec61c0761165d758f73004fdfdf; from 53e6242db8d60da0587d36951cc9434d1a1c21dd before 91b3ecd34b60f950c50c560974945b6596a6f207; 53e6242db8d60da0587d36951cc9434d1a1c21dd builds before 01feaf024f29618d5ffa7ab0fd858e0579dcbf7b; from 53e6242db8d60da0587d36951cc9434d1a1c21dd before fcb21bf747640c9d6bd1eda9da85420f076d59c1; from 53e6242db8d60da0587d36951cc9434d1a1c21dd before f8f680609c2b3ab795ffcd6f21585b6dfc46d395 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.3 before 5.10.261; from 5.11 before 5.15.212; from 5.16 before 6.1.178; from 6.2 before 6.6.145; from 6.7 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4; 7.2; and 1 more ranges | NVD |
References
- https://git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0dbpatch
- https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17patch
- https://git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483patch
- https://git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdfpatch
- https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207patch
- https://git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7bpatch
- https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1patch
- https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.