CVE-2026-98399 (GCVE-0-2026-98399)

Vulnerability from cvelistv5 – Published: 2026-10-14 13:26 – Updated: 2026-10-19 09:18
VLAI
Title
s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7061 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 099b765139929efdcf232f8870804accf8c4cdc5 , < 41647864e62b28388ecccc23a82f0e0a091f4ef2 (git)
Affected: 099b765139929efdcf232f8870804accf8c4cdc5 , < aed56fa3108b7095e6a048e134981506c056a6cb (git)
Affected: 099b765139929efdcf232f8870804accf8c4cdc5 , < 8d7988e8116c3d29d9e02ca9d37ee84577643f2d (git)
Affected: 099b765139929efdcf232f8870804accf8c4cdc5 , < 280ff19853440d59e031cd8fe161e81305721262 (git)
Affected: 099b765139929efdcf232f8870804accf8c4cdc5 , < 37f61b71cbc0caefc01022a19ee56fc2510e2e6e (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kernel/ipl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "41647864e62b28388ecccc23a82f0e0a091f4ef2",
              "status": "affected",
              "version": "099b765139929efdcf232f8870804accf8c4cdc5",
              "versionType": "git"
            },
            {
              "lessThan": "aed56fa3108b7095e6a048e134981506c056a6cb",
              "status": "affected",
              "version": "099b765139929efdcf232f8870804accf8c4cdc5",
              "versionType": "git"
            },
            {
              "lessThan": "8d7988e8116c3d29d9e02ca9d37ee84577643f2d",
              "status": "affected",
              "version": "099b765139929efdcf232f8870804accf8c4cdc5",
              "versionType": "git"
            },
            {
              "lessThan": "280ff19853440d59e031cd8fe161e81305721262",
              "status": "affected",
              "version": "099b765139929efdcf232f8870804accf8c4cdc5",
              "versionType": "git"
            },
            {
              "lessThan": "37f61b71cbc0caefc01022a19ee56fc2510e2e6e",
              "status": "affected",
              "version": "099b765139929efdcf232f8870804accf8c4cdc5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kernel/ipl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.30"
            },
            {
              "lessThan": "2.6.30",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98399",
      "date": "2026-10-23",
      "epss": "0.00209",
      "percentile": "0.10536"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-21T18:42:07.000Z",
      "cve": "CVE-2026-98399",
      "id": "msrc_CVE-2026-98399",
      "initial_release_date": "2026-10-16T01:04:10.000Z",
      "product_status:known_not_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98399.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "arch/s390/kernel/ipl.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "41647864e62b28388ecccc23a82f0e0a091f4ef2",
                    "status": "affected",
                    "version": "099b765139929efdcf232f8870804accf8c4cdc5",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "aed56fa3108b7095e6a048e134981506c056a6cb",
                    "status": "affected",
                    "version": "099b765139929efdcf232f8870804accf8c4cdc5",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "8d7988e8116c3d29d9e02ca9d37ee84577643f2d",
                    "status": "affected",
                    "version": "099b765139929efdcf232f8870804accf8c4cdc5",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "280ff19853440d59e031cd8fe161e81305721262",
                    "status": "affected",
                    "version": "099b765139929efdcf232f8870804accf8c4cdc5",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "37f61b71cbc0caefc01022a19ee56fc2510e2e6e",
                    "status": "affected",
                    "version": "099b765139929efdcf232f8870804accf8c4cdc5",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "arch/s390/kernel/ipl.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "2.6.30"
                  },
                  {
                    "lessThan": "2.6.30",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.158",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.111",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.53",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.7",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-98399",
        "lastModified": "2026-10-19T10:18:44.700",
        "metrics": {},
        "published": "2026-10-14T14:17:50.893",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/280ff19853440d59e031cd8fe161e81305721262"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/37f61b71cbc0caefc01022a19ee56fc2510e2e6e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/41647864e62b28388ecccc23a82f0e0a091f4ef2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8d7988e8116c3d29d9e02ca9d37ee84577643f2d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/aed56fa3108b7095e6a048e134981506c056a6cb"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-10-18T08:29:19+00:00",
      "cve": "CVE-2026-98399",
      "id": "CVE-2026-98399",
      "initial_release_date": "2026-10-14T00:00:00+00:00",
      "product_status:known_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98399.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.