CVE-2026-64347
usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler
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.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to include the fix.
- Use list_first_entry_or_null to ensure proper checks.
- Validate that cdev->configs is not empty before accessing descriptors.
- Review USB gadget driver configurations and unbind procedures.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64347.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64347 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64347
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64347 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64347 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '2454264b2ab4cf0055c0bfd39e79f830452bd0db', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': 'd3e72cfef2e38bd588055739a8100d14f9773b17', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '56add2b9b2e89ec61c0761165d758f73004fdfdf', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '91b3ecd34b60f950c50c560974945b6596a6f207', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '01feaf024f29618d5ffa7ab0fd858e0579dcbf7b', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': 'fcb21bf747640c9d6bd1eda9da85420f076d59c1', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': 'f8f680609c2b3ab795ffcd6f21585b6dfc46d395', 'versionType': 'git'}], 'programFiles': ['drivers/usb/gadget/composite.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.3'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.3', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/gadget/composite.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '2454264b2ab4cf0055c0bfd39e79f830452bd0db', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': 'd3e72cfef2e38bd588055739a8100d14f9773b17', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '56add2b9b2e89ec61c0761165d758f73004fdfdf', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '91b3ecd34b60f950c50c560974945b6596a6f207', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '01feaf024f29618d5ffa7ab0fd858e0579dcbf7b', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': 'fcb21bf747640c9d6bd1eda9da85420f076d59c1', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': 'f8f680609c2b3ab795ffcd6f21585b6dfc46d395', 'versionType': 'git'}], 'programFiles': ['drivers/usb/gadget/composite.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.3'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.3', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/gadget/composite.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '2454264b2ab4cf0055c0bfd39e79f830452bd0db', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': 'd3e72cfef2e38bd588055739a8100d14f9773b17', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '56add2b9b2e89ec61c0761165d758f73004fdfdf', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '91b3ecd34b60f950c50c560974945b6596a6f207', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': '01feaf024f29618d5ffa7ab0fd858e0579dcbf7b', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': 'fcb21bf747640c9d6bd1eda9da85420f076d59c1', 'versionType': 'git'}, {'status': 'affected', 'version': '53e6242db8d60da0587d36951cc9434d1a1c21dd', 'lessThan': 'f8f680609c2b3ab795ffcd6f21585b6dfc46d395', 'versionType': 'git'}], 'programFiles': ['drivers/usb/gadget/composite.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.3'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.3', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/usb/gadget/composite.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7b Added Reference https://git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0db Added Reference https://git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdf Added Reference https://git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483 Added Reference https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207 Added Reference https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17 Added Reference https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395 Added Reference https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1