{"id":"CVE-2026-64347","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:\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:…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < 2454264b2ab4cf0055c0bfd39e79f830452bd0db","Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < d3e72cfef2e38bd588055739a8100d14f9773b17","Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < 8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483","Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < 56add2b9b2e89ec61c0761165d758f73004fdfdf","Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < 91b3ecd34b60f950c50c560974945b6596a6f207","Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < 01feaf024f29618d5ffa7ab0fd858e0579dcbf7b","Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < fcb21bf747640c9d6bd1eda9da85420f076d59c1","Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < f8f680609c2b3ab795ffcd6f21585b6dfc46d395","Linux 4.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:36:21.482488Z"},"published":"2026-07-25","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:44:48.115Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64347","references":[{"url":"https://git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0db"},{"url":"https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17"},{"url":"https://git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483"},{"url":"https://git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdf"},{"url":"https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207"},{"url":"https://git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7b"},{"url":"https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1"},{"url":"https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395"}],"tags":["cve.org"],"epss":0.00095,"epssPercentile":0.006,"ingestedAt":"2026-11-06T16:57:43.191Z","slug":"CVE-2026-64347","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < 2454264b2ab4cf0055c0bfd39e79f830452bd0db`\n- `Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < d3e72cfef2e38bd588055739a8100d14f9773b17`\n- `Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < 8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483`\n- `Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < 56add2b9b2e89ec61c0761165d758f73004fdfdf`\n- `Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < 91b3ecd34b60f950c50c560974945b6596a6f207`\n- `Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < 01feaf024f29618d5ffa7ab0fd858e0579dcbf7b`\n- `Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < fcb21bf747640c9d6bd1eda9da85420f076d59c1`\n- `Linux >= 53e6242db8d60da0587d36951cc9434d1a1c21dd < f8f680609c2b3ab795ffcd6f21585b6dfc46d395`\n- `Linux 4.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}