CVE-2026-64347: Linux kernel · usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in fcb21bf747640c9d6bd1eda9da85420f076d59c1 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:04 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in fcb21bf747640c9d6bd1eda9da85420f076d59c1, f8f680609c2b3ab795ffcd6f21585b6dfc46d395, d3e72cfef2e38bd588055739a8100d14f9773b17 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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.
References
- git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0db (opens in a new tab)
- git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17 (opens in a new tab)
- git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483 (opens in a new tab)
- git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdf (opens in a new tab)
- git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207 (opens in a new tab)
- git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7b (opens in a new tab)
- git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1 (opens in a new tab)
- git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395 (opens in a new tab)