{"api_version":"1","generated_at":"2026-07-23T14:16:12+00:00","cve":"CVE-2026-31720","urls":{"html":"https://cve.report/CVE-2026-31720","api":"https://cve.report/api/cve/CVE-2026-31720.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31720","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31720"},"summary":{"title":"usb: gadget: f_uac1_legacy: validate control request size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate control request size\n\nf_audio_complete() copies req->length bytes into a 4-byte stack\nvariable:\n\n  u32 data = 0;\n  memcpy(&data, req->buf, req->length);\n\nreq->length is derived from the host-controlled USB request path,\nwhich can lead to a stack out-of-bounds write.\n\nValidate req->actual against the expected payload size for the\nsupported control selectors and decode only the expected amount\nof data.\n\nThis avoids copying a host-influenced length into a fixed-size\nstack object.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-01 15:16:34","updated_at":"2026-05-06 20:58:09"},"problem_types":["CWE-787"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/21b11e8581285c6f10ef43d05df349d445f24273","name":"https://git.kernel.org/stable/c/21b11e8581285c6f10ef43d05df349d445f24273","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/26304d124e7f0383f8fe1168b5801a0ac7e16b1c","name":"https://git.kernel.org/stable/c/26304d124e7f0383f8fe1168b5801a0ac7e16b1c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605","name":"https://git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8","name":"https://git.kernel.org/stable/c/be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8e5eb1d6e6a3d7bbea9c92132d0cda5793176426","name":"https://git.kernel.org/stable/c/8e5eb1d6e6a3d7bbea9c92132d0cda5793176426","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0d41772d98dcaf6c17e875b7d0ea0154ae1191ee","name":"https://git.kernel.org/stable/c/0d41772d98dcaf6c17e875b7d0ea0154ae1191ee","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c6da4fed7537aec19880c24f6c3a95065adb1406","name":"https://git.kernel.org/stable/c/c6da4fed7537aec19880c24f6c3a95065adb1406","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6e0e34d85cd46ceb37d16054e97a373a32770f6c","name":"https://git.kernel.org/stable/c/6e0e34d85cd46ceb37d16054e97a373a32770f6c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31720","name":"CVE 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the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate control request size\n\nf_audio_complete() copies req->length bytes into a 4-byte stack\nvariable:\n\n  u32 data = 0;\n  memcpy(&data, req->buf, req->length);\n\nreq->length is derived from the host-controlled USB request path,\nwhich can lead to a stack out-of-bounds write.\n\nValidate req->actual against the expected payload size for the\nsupported control selectors and decode only the expected amount\nof data.\n\nThis avoids copying a host-influenced length into a fixed-size\nstack 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gadget: f_uac1_legacy: validate control request size","CVE":"CVE-2026-31720","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31720","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate control request size\n\nf_audio_complete() copies req->length bytes into a 4-byte stack\nvariable:\n\n  u32 data = 0;\n  memcpy(&data, req->buf, req->length);\n\nreq->length is derived from the host-controlled USB request path,\nwhich can lead to a stack out-of-bounds write.\n\nValidate req->actual against the expected payload size for the\nsupported control selectors and decode only the expected amount\nof data.\n\nThis avoids copying a host-influenced length into a fixed-size\nstack object.","Type":"Description","Title":"usb: gadget: f_uac1_legacy: validate control request size"}]}}}