{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98400",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.346Z",
        "datePublished": "2026-10-14T13:26:00.872Z",
        "dateUpdated": "2026-10-14T13:26:00.872Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-14T13:26:00.872Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/s390/kernel/ipl.c"
                    ],
                    "versions": [
                        {
                            "version": "3b9678472bab86ae654cf2c18d5dd551558045be",
                            "lessThan": "030e88812435fc5d6aa42eee41fa77b5ea620327",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3b9678472bab86ae654cf2c18d5dd551558045be",
                            "lessThan": "92d0829eae257544b6b0faccb6e7079c45e22d48",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3b9678472bab86ae654cf2c18d5dd551558045be",
                            "lessThan": "50f9c40768e84f30d374235b3ee3850a94d9ac29",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3b9678472bab86ae654cf2c18d5dd551558045be",
                            "lessThan": "b6bf82bc5e00afaf836f8bb9a676bffc182a6bbd",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3b9678472bab86ae654cf2c18d5dd551558045be",
                            "lessThan": "7f918871112e8e7c581e99eb8e545af4e59c8367",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/s390/kernel/ipl.c"
                    ],
                    "versions": [
                        {
                            "version": "4.17",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.17",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.111",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.7",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3-rc2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.17",
                                    "versionEndExcluding": "6.6.158"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.17",
                                    "versionEndExcluding": "6.12.111"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.17",
                                    "versionEndExcluding": "6.18.53"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.17",
                                    "versionEndExcluding": "7.2.7"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.17",
                                    "versionEndExcluding": "7.3-rc2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/030e88812435fc5d6aa42eee41fa77b5ea620327"
                },
                {
                    "url": "https://git.kernel.org/stable/c/92d0829eae257544b6b0faccb6e7079c45e22d48"
                },
                {
                    "url": "https://git.kernel.org/stable/c/50f9c40768e84f30d374235b3ee3850a94d9ac29"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b6bf82bc5e00afaf836f8bb9a676bffc182a6bbd"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7f918871112e8e7c581e99eb8e545af4e59c8367"
                }
            ],
            "title": "s390/ipl: Fix NULL deref in kdump without re-IPL parm block",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}