CVE-2026-64347 (GCVE-0-2026-64347)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-08-17 04:53
VLAI
EPSS
VEX
Title
usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler
Summary
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.
Severity
5.5 (Medium)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
53e6242db8d60da0587d36951cc9434d1a1c21dd , < 2454264b2ab4cf0055c0bfd39e79f830452bd0db
(git)
Affected: 53e6242db8d60da0587d36951cc9434d1a1c21dd , < d3e72cfef2e38bd588055739a8100d14f9773b17 (git) Affected: 53e6242db8d60da0587d36951cc9434d1a1c21dd , < 8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483 (git) Affected: 53e6242db8d60da0587d36951cc9434d1a1c21dd , < 56add2b9b2e89ec61c0761165d758f73004fdfdf (git) Affected: 53e6242db8d60da0587d36951cc9434d1a1c21dd , < 91b3ecd34b60f950c50c560974945b6596a6f207 (git) Affected: 53e6242db8d60da0587d36951cc9434d1a1c21dd , < 01feaf024f29618d5ffa7ab0fd858e0579dcbf7b (git) Affected: 53e6242db8d60da0587d36951cc9434d1a1c21dd , < fcb21bf747640c9d6bd1eda9da85420f076d59c1 (git) Affected: 53e6242db8d60da0587d36951cc9434d1a1c21dd , < f8f680609c2b3ab795ffcd6f21585b6dfc46d395 (git) |
guessed | |
| Linux | Linux |
Affected:
4.3
Unaffected: 0 , < 4.3 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: composite: fix dead empty check in the USB_DT_OTG handler\n\nThe OTG branch of composite_setup() falls back to the first\nconfiguration when none is selected:\n\n\tif (cdev-\u003econfig)\n\t\tconfig = cdev-\u003econfig;\n\telse\n\t\tconfig = list_first_entry(\u0026cdev-\u003econfigs,\n\t\t\t\t\t struct usb_configuration, list);\n\tif (!config)\n\t\tgoto done;\n\t...\n\tmemcpy(req-\u003ebuf, config-\u003edescriptors[0], value);\n\nlist_first_entry() never returns NULL. On an empty list it returns\ncontainer_of() of the list head. So the \"if (!config)\" check is dead.\n\nWhen cdev-\u003econfigs is empty, config points at the head inside struct\nusb_composite_dev. config-\u003edescriptors[0] reads whatever sits at that\noffset. The memcpy copies up to w_length bytes of it into the response\nbuffer.\n\ncdev-\u003econfigs can be empty in two cases. One is a teardown race on\ngadget unbind with a control transfer in flight. The other is a driver\nthat sets is_otg before it adds a config. A reproducer that holds\ncdev-\u003econfigs empty triggers a KASAN fault in this branch.\n\nUse list_first_entry_or_null() so the existing check does its job."
}
],
"id": "CVE-2026-64347",
"lastModified": "2026-09-03T16:04:02.520",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
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},
"published": "2026-07-25T10:17:16.893",
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"Patch"
],
"url": "https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-667"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-03T16:48:49+00:00",
"cve": "CVE-2026-64347",
"id": "CVE-2026-64347",
"initial_release_date": "2026-07-25T00:00:00+00:00",
"product_status:known_affected": "76",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64347.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-10T02:24:48Z",
"cve": "CVE-2026-64347",
"id": "CVE-2026-64347",
"initial_release_date": "2026-07-25T16:01:18Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "671",
"product_status:known_not_affected": "50",
"product_status:recommended": "254",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64347",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64347.json",
"version": "10"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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