{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3b9678472bab86ae654cf2c18d5dd551558045be"
            },
            {
              "fixed": "030e88812435fc5d6aa42eee41fa77b5ea620327"
            },
            {
              "fixed": "92d0829eae257544b6b0faccb6e7079c45e22d48"
            },
            {
              "fixed": "50f9c40768e84f30d374235b3ee3850a94d9ac29"
            },
            {
              "fixed": "b6bf82bc5e00afaf836f8bb9a676bffc182a6bbd"
            },
            {
              "fixed": "7f918871112e8e7c581e99eb8e545af4e59c8367"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.17.0"
            },
            {
              "fixed": "6.6.158"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.111"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98400.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/ipl: Fix NULL deref in kdump without re-IPL parm block\n\nSome IPL types, like HMC FTP boot or QEMU direct kernel boot, might\nnot provide an IPL parameter block. In this case, reipl_type_init()\nselects IPL_TYPE_UNKNOWN, and reipl_block_actual remains NULL.\n\nkdump passes the re-IPL parameter block to the dump kernel through\nos_info. Before commit 3b9678472bab (\"s390/ipl: correct kdump reipl\nblock checksum calculation\"), the os_info entry was added only for\nIPL types which initialized reipl_block_actual. That commit moved the\nos_info update to machine_crash_shutdown(), making it unconditional. As\na result, set_os_info_reipl_block() dereferences reipl_block_actual for\nIPL_TYPE_UNKNOWN. This may happen to work by chance when address zero\ncontains readable lowcore data and the resulting empty os_info entry is\nignored by the dump kernel.\n\nSkip the os_info update when no re-IPL parameter block is available.\nKdump then collect the dump and reboot without setting re-IPL parameter\nblock.",
  "id": "CVE-2026-98400",
  "modified": "2026-10-15T02:30:27.962868074Z",
  "published": "2026-10-14T13:26:00.872Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/030e88812435fc5d6aa42eee41fa77b5ea620327"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50f9c40768e84f30d374235b3ee3850a94d9ac29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f918871112e8e7c581e99eb8e545af4e59c8367"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92d0829eae257544b6b0faccb6e7079c45e22d48"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6bf82bc5e00afaf836f8bb9a676bffc182a6bbd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98400.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98400"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "s390/ipl: Fix NULL deref in kdump without re-IPL parm block"
}