{"id":"CVE-2026-64347","state":"PUBLISHED","title":"usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler","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.","publishedAt":"2026-07-25T08:50:08.338Z","updatedAt":"2026-08-17T04:53:52.339Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"2454264b2ab4cf0055c0bfd39e79f830452bd0db","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"d3e72cfef2e38bd588055739a8100d14f9773b17","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"56add2b9b2e89ec61c0761165d758f73004fdfdf","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"91b3ecd34b60f950c50c560974945b6596a6f207","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"01feaf024f29618d5ffa7ab0fd858e0579dcbf7b","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"fcb21bf747640c9d6bd1eda9da85420f076d59c1","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"f8f680609c2b3ab795ffcd6f21585b6dfc46d395","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/composite.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.3","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/composite.c"]}],"references":["https://git.kernel.org/stable/c/2454264b2ab4cf0055c0bfd39e79f830452bd0db","https://git.kernel.org/stable/c/d3e72cfef2e38bd588055739a8100d14f9773b17","https://git.kernel.org/stable/c/8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483","https://git.kernel.org/stable/c/56add2b9b2e89ec61c0761165d758f73004fdfdf","https://git.kernel.org/stable/c/91b3ecd34b60f950c50c560974945b6596a6f207","https://git.kernel.org/stable/c/01feaf024f29618d5ffa7ab0fd858e0579dcbf7b","https://git.kernel.org/stable/c/fcb21bf747640c9d6bd1eda9da85420f076d59c1","https://git.kernel.org/stable/c/f8f680609c2b3ab795ffcd6f21585b6dfc46d395"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64347.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64347","state":"PUBLISHED","datePublished":"2026-07-25T08:50:08.338Z","dateUpdated":"2026-08-17T04:53:52.339Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.782Z"},"containers":{"cna":{"title":"usb: gadget: composite: fix dead empty check in the USB_DT_OTG handler","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->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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"2454264b2ab4cf0055c0bfd39e79f830452bd0db","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"d3e72cfef2e38bd588055739a8100d14f9773b17","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"8ac463fe6c0f85bdb1ce8c30e8c9e060802e4483","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"56add2b9b2e89ec61c0761165d758f73004fdfdf","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"91b3ecd34b60f950c50c560974945b6596a6f207","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"01feaf024f29618d5ffa7ab0fd858e0579dcbf7b","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"fcb21bf747640c9d6bd1eda9da85420f076d59c1","versionType":"git"},{"version":"53e6242db8d60da0587d36951cc9434d1a1c21dd","status":"affected","lessThan":"f8f680609c2b3ab795ffcd6f21585b6dfc46d395","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/composite.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.3","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/composite.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:53:52.339Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.3","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}