{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c6994e6f067cf0fc4c6cca3d164018b1150916f8"
            },
            {
              "fixed": "557d1d4e862eccd0b74cc377b66de3e1e8d49605"
            },
            {
              "fixed": "21b11e8581285c6f10ef43d05df349d445f24273"
            },
            {
              "fixed": "0d41772d98dcaf6c17e875b7d0ea0154ae1191ee"
            },
            {
              "fixed": "c6da4fed7537aec19880c24f6c3a95065adb1406"
            },
            {
              "fixed": "be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8"
            },
            {
              "fixed": "8e5eb1d6e6a3d7bbea9c92132d0cda5793176426"
            },
            {
              "fixed": "26304d124e7f0383f8fe1168b5801a0ac7e16b1c"
            },
            {
              "fixed": "6e0e34d85cd46ceb37d16054e97a373a32770f6c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.31"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.134"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31720.json"
  },
  "details": "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-\u003elength bytes into a 4-byte stack\nvariable:\n\n  u32 data = 0;\n  memcpy(\u0026data, req-\u003ebuf, req-\u003elength);\n\nreq-\u003elength is derived from the host-controlled USB request path,\nwhich can lead to a stack out-of-bounds write.\n\nValidate req-\u003eactual 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.",
  "id": "CVE-2026-31720",
  "modified": "2026-07-08T05:36:00.355181678Z",
  "published": "2026-05-01T14:14:22.832Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d41772d98dcaf6c17e875b7d0ea0154ae1191ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21b11e8581285c6f10ef43d05df349d445f24273"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26304d124e7f0383f8fe1168b5801a0ac7e16b1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/557d1d4e862eccd0b74cc377b66de3e1e8d49605"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e0e34d85cd46ceb37d16054e97a373a32770f6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e5eb1d6e6a3d7bbea9c92132d0cda5793176426"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be2d32f0c3fe333d14c0a9ca90328dacbc3e06b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c6da4fed7537aec19880c24f6c3a95065adb1406"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31720.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31720"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "usb: gadget: f_uac1_legacy: validate control request size"
}