usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler
Summary
| CVE | CVE-2026-64347 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-25 10:17:16 UTC |
| Updated | 2026-07-25 10:17:16 UTC |
| 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. |
Risk And Classification
EPSS: 0.001770000 probability, percentile 0.075070000 (date 2026-07-28)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 53e6242db8d60da0587d36951cc9434d1a1c21dd 2454264b2ab4cf0055c0bfd39e79f830452bd0db git | Not specified |
| CNA | Linux | Linux | affected 53e6242db8d60da0587d36951cc9434d1a1c21dd d3e72cfef2e38bd588055739a8100d14f9773b17 git | Not specified |
| CNA | Linux | Linux | affected 53e6242db8d60da0587d36951cc9434d1a1c21dd 8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483 git | Not specified |
| CNA | Linux | Linux | affected 53e6242db8d60da0587d36951cc9434d1a1c21dd 56add2b9b2e89ec61c0761165d758f73004fdfdf git | Not specified |
| CNA | Linux | Linux | affected 53e6242db8d60da0587d36951cc9434d1a1c21dd 91b3ecd34b60f950c50c560974945b6596a6f207 git | Not specified |
| CNA | Linux | Linux | affected 53e6242db8d60da0587d36951cc9434d1a1c21dd 01feaf024f29618d5ffa7ab0fd858e0579dcbf7b git | Not specified |
| CNA | Linux | Linux | affected 53e6242db8d60da0587d36951cc9434d1a1c21dd fcb21bf747640c9d6bd1eda9da85420f076d59c1 git | Not specified |
| CNA | Linux | Linux | affected 53e6242db8d60da0587d36951cc9434d1a1c21dd f8f680609c2b3ab795ffcd6f21585b6dfc46d395 git | Not specified |
| CNA | Linux | Linux | affected 4.3 | Not specified |
| CNA | Linux | Linux | unaffected 4.3 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.261 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.212 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.178 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.96 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.39 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.4 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2-rc3 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0db | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdf | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.