FKIE_CVE-2026-64347
Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-25 10:17
Severity
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/usb/gadget/composite.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "2454264b2ab4cf0055c0bfd39e79f830452bd0db",
"status": "affected",
"version": "53e6242db8d60da0587d36951cc9434d1a1c21dd",
"versionType": "git"
},
{
"lessThan": "d3e72cfef2e38bd588055739a8100d14f9773b17",
"status": "affected",
"version": "53e6242db8d60da0587d36951cc9434d1a1c21dd",
"versionType": "git"
},
{
"lessThan": "8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483",
"status": "affected",
"version": "53e6242db8d60da0587d36951cc9434d1a1c21dd",
"versionType": "git"
},
{
"lessThan": "56add2b9b2e89ec61c0761165d758f73004fdfdf",
"status": "affected",
"version": "53e6242db8d60da0587d36951cc9434d1a1c21dd",
"versionType": "git"
},
{
"lessThan": "91b3ecd34b60f950c50c560974945b6596a6f207",
"status": "affected",
"version": "53e6242db8d60da0587d36951cc9434d1a1c21dd",
"versionType": "git"
},
{
"lessThan": "01feaf024f29618d5ffa7ab0fd858e0579dcbf7b",
"status": "affected",
"version": "53e6242db8d60da0587d36951cc9434d1a1c21dd",
"versionType": "git"
},
{
"lessThan": "fcb21bf747640c9d6bd1eda9da85420f076d59c1",
"status": "affected",
"version": "53e6242db8d60da0587d36951cc9434d1a1c21dd",
"versionType": "git"
},
{
"lessThan": "f8f680609c2b3ab795ffcd6f21585b6dfc46d395",
"status": "affected",
"version": "53e6242db8d60da0587d36951cc9434d1a1c21dd",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/usb/gadget/composite.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.3"
},
{
"lessThan": "4.3",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2-rc3",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"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": "2026-07-25T10:17:16.893",
"metrics": {},
"published": "2026-07-25T10:17:16.893",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0db"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdf"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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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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