{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8fcc231ce3bea12b78bb94b280cdc03cff342435"
            },
            {
              "fixed": "02028a24e26d85262ab9c8fc4344e1f3503007fc"
            },
            {
              "fixed": "433e5e70cdc1edf382d28d08a885b22e2b98b7da"
            },
            {
              "fixed": "614aa0491c7a190556c2345dddee0b6f5ed90989"
            },
            {
              "fixed": "1ac287e2af9a9112fe271427ef45eceb26bce8b4"
            }
          ],
          "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-2026-64558.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pkey: Check length in pkey_pckmo handler implementation\n\nExplicitly check the length of the target buffer in the pkey_pckmo\nimplementation of the key_to_protkey() handler function. The handler\nfunction fails, if the generated output data exceeds the length of the\nprovided target buffer.",
  "id": "CVE-2026-64558",
  "modified": "2026-08-18T03:30:52.311138868Z",
  "published": "2026-07-29T16:31:21.591Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/02028a24e26d85262ab9c8fc4344e1f3503007fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ac287e2af9a9112fe271427ef45eceb26bce8b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/433e5e70cdc1edf382d28d08a885b22e2b98b7da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/614aa0491c7a190556c2345dddee0b6f5ed90989"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64558.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64558"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "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_pckmo handler implementation"
}