{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3416eaa1f8f8d516b77de514e14cf8da256d28fb"
            },
            {
              "fixed": "4fcb22218f0a7229b7ce3b3952fb644def293fa5"
            },
            {
              "fixed": "ad3d1628a46134276546d7a12fedf04be9979158"
            },
            {
              "fixed": "52e18ae0c47c5c89e18fcd8022f287f7cc8802ec"
            },
            {
              "fixed": "4bcaa59f403dbde6328604a500d65ee8d40975d9"
            },
            {
              "fixed": "1ef25704bd3b625fd151c09feee459479f71ee64"
            },
            {
              "fixed": "284105c40fc31fff90cdab8a0377aaeb92f87f0e"
            },
            {
              "fixed": "6c13f3bb652bc8665e709ba07122612586aea648"
            },
            {
              "fixed": "e1a9d791fd66ab2431b9e6f6f835823809869047"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.26"
            },
            {
              "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-2026-63956.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: cypress_m8: fix memory corruption with small endpoint\n\nMake sure that the interrupt-out endpoint max packet size is at least\neight bytes to avoid user-controlled slab corruption or NULL-pointer\ndereference should a malicious device report a smaller size.",
  "id": "CVE-2026-63956",
  "modified": "2026-07-21T03:42:08.263462217Z",
  "published": "2026-07-19T14:55:47.597Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ef25704bd3b625fd151c09feee459479f71ee64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/284105c40fc31fff90cdab8a0377aaeb92f87f0e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bcaa59f403dbde6328604a500d65ee8d40975d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4fcb22218f0a7229b7ce3b3952fb644def293fa5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52e18ae0c47c5c89e18fcd8022f287f7cc8802ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c13f3bb652bc8665e709ba07122612586aea648"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad3d1628a46134276546d7a12fedf04be9979158"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1a9d791fd66ab2431b9e6f6f835823809869047"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63956.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63956"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "USB: serial: cypress_m8: fix memory corruption with small endpoint"
}