CVE-2026-98399 (GCVE-0-2026-98399)
Vulnerability from cvelistv5
Published
2026-10-14 13:26
Modified
2026-10-19 09:18
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block Unlike kdump, which passes the re-IPL parameter block through os_info, the stand-alone dump passes it through the IPL parm block address and checksum in lowcore. Some IPL types, like HMC FTP boot or QEMU direct kernel boot, might not provide an IPL parameter block. In this case reipl_type_init() selects IPL_TYPE_UNKNOWN and reipl_block_actual remains NULL. Nevertheless, dump_reipl_run() unconditionally dereferences it when preparing the lowcore fields. This may happen to work by chance when address zero contains readable lowcore data. A zero IPL parameter block address is then stored in lowcore, causing the stand-alone dumper to enter disabled wait after completing the dump. Explicitly store a zero IPL parameter block address and checksum when no re-IPL parameter block is available. This does not change the behavior: the stand-alone dumper completes the dump and halts, while valid re-IPL parameter blocks continue to be handled as before.
References
Impacted products
Vendor Product Version
Linux Linux Version: 099b765139929efdcf232f8870804accf8c4cdc5
Version: 099b765139929efdcf232f8870804accf8c4cdc5
Version: 099b765139929efdcf232f8870804accf8c4cdc5
Version: 099b765139929efdcf232f8870804accf8c4cdc5
Version: 099b765139929efdcf232f8870804accf8c4cdc5
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kernel/ipl.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "7.2.7",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block\n\nUnlike kdump, which passes the re-IPL parameter block through os_info,\nthe stand-alone dump passes it through the IPL parm block address and\nchecksum in lowcore.\n\nSome IPL types, like HMC FTP boot or QEMU direct kernel boot, might not\nprovide an IPL parameter block. In this case reipl_type_init() selects\nIPL_TYPE_UNKNOWN and reipl_block_actual remains NULL. Nevertheless,\ndump_reipl_run() unconditionally dereferences it when preparing the\nlowcore fields. This may happen to work by chance when address zero\ncontains readable lowcore data. A zero IPL parameter block address is\nthen stored in lowcore, causing the stand-alone dumper to enter disabled\nwait after completing the dump.\n\nExplicitly store a zero IPL parameter block address and checksum when no\nre-IPL parameter block is available. This does not change the behavior:\nthe stand-alone dumper completes the dump and halts, while valid re-IPL\nparameter blocks continue to be handled as before."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:18:52.784Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/41647864e62b28388ecccc23a82f0e0a091f4ef2"
        },
        {
          "url": "https://git.kernel.org/stable/c/aed56fa3108b7095e6a048e134981506c056a6cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d7988e8116c3d29d9e02ca9d37ee84577643f2d"
        },
        {
          "url": "https://git.kernel.org/stable/c/280ff19853440d59e031cd8fe161e81305721262"
        },
        {
          "url": "https://git.kernel.org/stable/c/37f61b71cbc0caefc01022a19ee56fc2510e2e6e"
        }
      ],
      "title": "s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98399",
    "datePublished": "2026-10-14T13:26:00.278Z",
    "dateReserved": "2026-09-25T10:25:14.346Z",
    "dateUpdated": "2026-10-19T09:18:52.784Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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