s390/pkey: Check length in pkey_pckmo handler implementation

{
  "id": "dfd0e1b7bd179e408ca9f589e7daf51f30fcc9a3a291240deef7e49ef60439eb",
  "url": "https://osv.dev/vulnerability/CVE-2026-64558",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "s390/pkey: Check length in pkey_pckmo handler implementation",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in pkey_pckmo handler implementation Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer.",
    "evidence": "osv:CVE-2026-64558",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.97",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-64558",
      "aliases": [
        "CVE-2026-64558"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8fcc231ce3bea12b78bb94b280cdc03cff342435"
                },
                {
                  "fixed": "02028a24e26d85262ab9c8fc4344e1f3503007fc"
                },
                {
                  "fixed": "433e5e70cdc1edf382d28d08a885b22e2b98b7da"
                },
                {
                  "fixed": "614aa0491c7a190556c2345dddee0b6f5ed90989"
                },
                {
                  "fixed": "1ac287e2af9a9112fe271427ef45eceb26bce8b4"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64558.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "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"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64558.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.157407565Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/02028a24e26d85262ab9c8fc4344e1f3503007fc",
        "https://git.kernel.org/stable/c/1ac287e2af9a9112fe271427ef45eceb26bce8b4",
        "https://git.kernel.org/stable/c/433e5e70cdc1edf382d28d08a885b22e2b98b7da",
        "https://git.kernel.org/stable/c/614aa0491c7a190556c2345dddee0b6f5ed90989",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64558.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64558",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64558.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64558",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510084,
  "published_at": "2026-07-29T16:31:21.591+00:00"
}