iommu/s390: Fix NULL dereference in iova_to_phys() with ZPCI_TABLE_TYPE_RFX

{
  "id": "9c9b75e5120b49719663edf11c2ddb06e2953a961ca3fb05bca36048cdd96d20",
  "url": "https://osv.dev/vulnerability/CVE-2026-97593",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iommu/s390: Fix NULL dereference in iova_to_phys() with ZPCI_TABLE_TYPE_RFX",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iommu/s390: Fix NULL dereference in iova_to_phys() with ZPCI_TABLE_TYPE_RFX When using a 5-level translation table via ZPCI_TABLE_TYPE_RFX get_rso_from_iova() returns NULL when the region-first entry is invalid. Yet in get_rto_from_iova() the region-second origin rso is not checked to be non-NULL before accessing rso[rsx] leading to a NULL pointer dereference instead of a NULL return when iova_to_phys() is called on a unmapped IOVA. Fix this by adding the missing NULL check.",
    "evidence": "osv:CVE-2026-97593",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.53",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-97593",
      "aliases": [
        "CVE-2026-97593"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "81244074b518aeb90de5f68e7e825564c29c5c50"
                },
                {
                  "fixed": "d0502ed0a1aae97e2ab7a21545903ba612d9f02e"
                },
                {
                  "fixed": "41b5e0ce6801bf04d8fd3bca46e8c393349ebd5c"
                },
                {
                  "fixed": "20db6573301e66cd65ebf6c130b6563c69374d9d"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97593.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.18.53"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97593.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.472575906Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/20db6573301e66cd65ebf6c130b6563c69374d9d",
        "https://git.kernel.org/stable/c/41b5e0ce6801bf04d8fd3bca46e8c393349ebd5c",
        "https://git.kernel.org/stable/c/d0502ed0a1aae97e2ab7a21545903ba612d9f02e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97593.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-97593",
        "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/2026/97xxx/CVE-2026-97593.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-97593",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 521397,
  "published_at": "2026-09-25T10:22:09.913+00:00"
}