{"api_version":"1","generated_at":"2026-09-02T04:26:04+00:00","cve":"CVE-2026-64327","urls":{"html":"https://cve.report/CVE-2026-64327","api":"https://cve.report/api/cve/CVE-2026-64327.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64327","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64327"},"summary":{"title":"usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks\n\nWhen parsing endpoint descriptors, ffs_data_got_descs() generates the\neps_addrmap which contains the endpoint direction. However, epfile->in\nwas previously only populated in ffs_func_eps_enable() which executes\nupon USB host connection. As a result, early userspace ioctls like\nFUNCTIONFS_DMABUF_ATTACH that run before the host connects would see\nepfile->in as 0, leading to incorrect DMA directions.\n\nBy moving the initialization to ffs_epfiles_create(), epfile->in is\naccurate before userspace opens the endpoint files.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:14","updated_at":"2026-08-17 05:17:33"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/f99f32ea9aa976afcbec20647ed33b50a52002c1","name":"https://git.kernel.org/stable/c/f99f32ea9aa976afcbec20647ed33b50a52002c1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/82cfd4739011bdc7e87b5d585703427e89ddfaa5","name":"https://git.kernel.org/stable/c/82cfd4739011bdc7e87b5d585703427e89ddfaa5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b","name":"https://git.kernel.org/stable/c/82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9e04055ab5fc0470a0031ee6934739f9aa8f34a5","name":"https://git.kernel.org/stable/c/9e04055ab5fc0470a0031ee6934739f9aa8f34a5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64327","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64327","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7b07a2a7ca02a20124b552be96c5a56910795488 82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7b07a2a7ca02a20124b552be96c5a56910795488 9e04055ab5fc0470a0031ee6934739f9aa8f34a5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7b07a2a7ca02a20124b552be96c5a56910795488 f99f32ea9aa976afcbec20647ed33b50a52002c1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7b07a2a7ca02a20124b552be96c5a56910795488 82cfd4739011bdc7e87b5d585703427e89ddfaa5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64327","cve":"CVE-2026-64327","epss":"0.002000000","percentile":"0.101990000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:48"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/usb/gadget/function/f_fs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b","status":"affected","version":"7b07a2a7ca02a20124b552be96c5a56910795488","versionType":"git"},{"lessThan":"9e04055ab5fc0470a0031ee6934739f9aa8f34a5","status":"affected","version":"7b07a2a7ca02a20124b552be96c5a56910795488","versionType":"git"},{"lessThan":"f99f32ea9aa976afcbec20647ed33b50a52002c1","status":"affected","version":"7b07a2a7ca02a20124b552be96c5a56910795488","versionType":"git"},{"lessThan":"82cfd4739011bdc7e87b5d585703427e89ddfaa5","status":"affected","version":"7b07a2a7ca02a20124b552be96c5a56910795488","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/usb/gadget/function/f_fs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","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","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks\n\nWhen parsing endpoint descriptors, ffs_data_got_descs() generates the\neps_addrmap which contains the endpoint direction. However, epfile->in\nwas previously only populated in ffs_func_eps_enable() which executes\nupon USB host connection. As a result, early userspace ioctls like\nFUNCTIONFS_DMABUF_ATTACH that run before the host connects would see\nepfile->in as 0, leading to incorrect DMA directions.\n\nBy moving the initialization to ffs_epfiles_create(), epfile->in is\naccurate before userspace opens the endpoint files."}],"providerMetadata":{"dateUpdated":"2026-08-17T04:53:29.409Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/82cf1142e5ccf2b6d6d22ef713aaf3e5f2b5716b"},{"url":"https://git.kernel.org/stable/c/9e04055ab5fc0470a0031ee6934739f9aa8f34a5"},{"url":"https://git.kernel.org/stable/c/f99f32ea9aa976afcbec20647ed33b50a52002c1"},{"url":"https://git.kernel.org/stable/c/82cfd4739011bdc7e87b5d585703427e89ddfaa5"}],"title":"usb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64327","datePublished":"2026-07-25T08:49:55.426Z","dateReserved":"2026-07-19T15:36:31.780Z","dateUpdated":"2026-08-17T04:53:29.409Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:14","lastModifiedDate":"2026-08-17 05:17:33","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64327","Ordinal":"1","Title":"usb: gadget: f_fs: Initialize epfile->in early to fix endpoint d","CVE":"CVE-2026-64327","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64327","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Initialize epfile->in early to fix endpoint direction checks\n\nWhen parsing endpoint descriptors, ffs_data_got_descs() generates the\neps_addrmap which contains the endpoint direction. However, epfile->in\nwas previously only populated in ffs_func_eps_enable() which executes\nupon USB host connection. As a result, early userspace ioctls like\nFUNCTIONFS_DMABUF_ATTACH that run before the host connects would see\nepfile->in as 0, leading to incorrect DMA directions.\n\nBy moving the initialization to ffs_epfiles_create(), epfile->in is\naccurate before userspace opens the endpoint files.","Type":"Description","Title":"usb: gadget: f_fs: Initialize epfile->in early to fix endpoint d"}]}}}