{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8fcc231ce3bea12b78bb94b280cdc03cff342435"
            },
            {
              "fixed": "0a9e34ccbe772b8f321388cdbdf4f22b94e513e7"
            },
            {
              "fixed": "693bf91d4db134f9b1c2840c8e287eee3d993bac"
            },
            {
              "fixed": "7e7e03848c918aa0acad5ffd75d929e3afec1554"
            },
            {
              "fixed": "b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.12.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64559.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pkey: Check length in PKEY_VERIFYPROTK ioctl\n\nExplicitly check the buffer length request structure provided by\nuser-space and fail, if it exceeds the buffer size.",
  "id": "CVE-2026-64559",
  "modified": "2026-07-31T03:33:48.294511990Z",
  "published": "2026-07-29T16:31:22.195Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a9e34ccbe772b8f321388cdbdf4f22b94e513e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/693bf91d4db134f9b1c2840c8e287eee3d993bac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e7e03848c918aa0acad5ffd75d929e3afec1554"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64559.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64559"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "s390/pkey: Check length in PKEY_VERIFYPROTK ioctl"
}