s390/debug: Fix NULL pointer dereference in debug_info_copy()

{
  "id": "1ec6d1981c12c3e91f70f62837095c2ca46a8de9f26c68d71a8d28d3ae82c142",
  "url": "https://osv.dev/vulnerability/CVE-2026-98593",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "s390/debug: Fix NULL pointer dereference in debug_info_copy()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: s390/debug: Fix NULL pointer dereference in debug_info_copy() When debug_register_static() fails, it clears areas, active_pages and active_entries but leaves the area bounds unchanged. Copying such an area, either by opening its view file or via debug_dump(), makes debug_info_copy() dereference the NULL pointers. Skip the copy loop when the source has no areas.",
    "evidence": "osv:CVE-2026-98593",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.222",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.189",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.55",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98593",
      "aliases": [
        "CVE-2026-98593"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "d72541f945127b4873dace501406a1bc8cd8e1e9"
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                {
                  "fixed": "13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225"
                },
                {
                  "fixed": "a19bede30f0da5ae56782edac62b5998a7434cba"
                },
                {
                  "fixed": "33f706884821da9cb55b650b7b1d4f2bdf800137"
                },
                {
                  "fixed": "2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b"
                },
                {
                  "fixed": "9c6af88fbefbe77608b77409df23a1617e28398c"
                },
                {
                  "fixed": "c593f38e1cdb92f87d01be4c4e5ac12417b1454b"
                },
                {
                  "fixed": "012bfcd5a51082d5a65f096dfb9ca652b5267965"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98593.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
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                {
                  "fixed": "5.15.222"
                }
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "5.16.0"
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                  "fixed": "6.1.189"
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                  "introduced": "6.2.0"
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                  "fixed": "6.6.158"
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              ]
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.13.0"
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                  "fixed": "6.18.55"
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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                {
                  "fixed": "7.2.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98593.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.390580940Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/012bfcd5a51082d5a65f096dfb9ca652b5267965",
        "https://git.kernel.org/stable/c/13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225",
        "https://git.kernel.org/stable/c/2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b",
        "https://git.kernel.org/stable/c/33f706884821da9cb55b650b7b1d4f2bdf800137",
        "https://git.kernel.org/stable/c/9c6af88fbefbe77608b77409df23a1617e28398c",
        "https://git.kernel.org/stable/c/a19bede30f0da5ae56782edac62b5998a7434cba",
        "https://git.kernel.org/stable/c/c593f38e1cdb92f87d01be4c4e5ac12417b1454b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98593.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98593",
        "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/2026/98xxx/CVE-2026-98593.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98593",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 496361,
  "published_at": "2026-10-18T15:19:05.272+00:00"
}