{"id":"CVE-2026-64347","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-64347","generatedAt":"2026-10-28T05:01:38.337Z","title":"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)…","description":"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->config)\n\t\tconfig = cdev->config;\n\telse\n\t\tconfig = list_first_entry(&cdev->configs,\n\t\t\t\t\t  struct usb_configuration, list);\n\tif (!config)\n\t\tgoto done;\n\t...\n\tmemcpy(req->buf, config->descriptors[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->configs is empty, config points at the head inside struct\nusb_composite_dev. config->descriptors[0] reads whatever sits at that\noffset. The memcpy copies up to w_length bytes of it into the response\nbuffer.\n\ncdev->configs 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->configs empty triggers a KASAN fault in this branch.\n\nUse list_first_entry_or_null() so the existing check does its job.","published":"2026-07-25T10:17:17.000Z","lastModified":"2026-09-03T16:04:03.000Z","status":"Analyzed","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-667"],"affected":["linux/linux kernel"],"epss":{"score":0.00095,"percentile":0.00602,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.10%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7b","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0db","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdf","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64347","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}