{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ee467a1f2066d2bfa293f7c2c7f1ff7000b0a39e"
            },
            {
              "fixed": "086b858b5f5125bc9d967ea2bd825f83d9f8f29d"
            },
            {
              "fixed": "2f3661eb2446e1ef593da45e01a3b21a906768ec"
            },
            {
              "fixed": "ccbec56f2f9af008f1574335cc6a668f16603e47"
            },
            {
              "fixed": "be3a1ed4ae51fa8dde57383277d336ce834f2cd9"
            },
            {
              "fixed": "e906545641d34fb1a09a65b4b5cfdff40eb09681"
            },
            {
              "fixed": "6c0cf56f00f280d72180bb6ce79741bc787a6269"
            },
            {
              "fixed": "b40166b4ef96067620a0f248e74ad9658c8f680c"
            },
            {
              "fixed": "4085f0dbb1ce2251c9a5938d693de6593f0ab2bd"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.14.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.93"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.35"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63899.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: mxuport: fix memory corruption with small endpoint\n\nMake sure that the bulk-out endpoint max packet size is at least eight\nbytes to avoid user-controlled slab corruption should a malicious device\nreport a smaller size.",
  "id": "CVE-2026-63899",
  "modified": "2026-07-21T03:42:04.063389041Z",
  "published": "2026-07-19T14:55:08.116Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/086b858b5f5125bc9d967ea2bd825f83d9f8f29d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f3661eb2446e1ef593da45e01a3b21a906768ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4085f0dbb1ce2251c9a5938d693de6593f0ab2bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c0cf56f00f280d72180bb6ce79741bc787a6269"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b40166b4ef96067620a0f248e74ad9658c8f680c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be3a1ed4ae51fa8dde57383277d336ce834f2cd9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccbec56f2f9af008f1574335cc6a668f16603e47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e906545641d34fb1a09a65b4b5cfdff40eb09681"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63899.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63899"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "USB: serial: mxuport: fix memory corruption with small endpoint"
}