CVE-2026-64167 (GCVE-0-2026-64167)
Vulnerability from cvelistv5
Published
2026-07-19 15:40
Modified
2026-07-19 15:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: kho: skip KHO for crash kernel kho_fill_kimage() unconditionally populates the kimage with KHO metadata for every kexec image type. When the image is a crash kernel, this can be problematic as the crash kernel can run in a small reserved region and the KHO scratch areas can sit outside it. The crash kernel then faults during kho_memory_init() when it tries phys_to_virt() on the KHO FDT address: Unable to handle kernel paging request at virtual address xxxxxxxx ... fdt_offset_ptr+... fdt_check_node_offset_+... fdt_first_property_offset+... fdt_get_property_namelen_+... fdt_getprop+... kho_memory_init+... mm_core_init+... start_kernel+... kho_locate_mem_hole() already skips KHO logic for KEXEC_TYPE_CRASH images, but kho_fill_kimage() was missing the same guard. As kho_fill_kimage() is the single point that populates image->kho.fdt and image->kho.scratch, fixing it here is sufficient for both arm64 and x86 as the FDT and boot_params path are bailing out when these fields are unset.
References
Impacted products
Vendor Product Version
Linux Linux Version: d7255959b69a4e727c61eb04231d11390d4f391e
Version: d7255959b69a4e727c61eb04231d11390d4f391e
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/liveupdate/kexec_handover.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a6ac6721326a75ff2d14c68db05f93b576d8762f",
              "status": "affected",
              "version": "d7255959b69a4e727c61eb04231d11390d4f391e",
              "versionType": "git"
            },
            {
              "lessThan": "a6715d7ec472a476db17787697a4abda62962284",
              "status": "affected",
              "version": "d7255959b69a4e727c61eb04231d11390d4f391e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/liveupdate/kexec_handover.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkho: skip KHO for crash kernel\n\nkho_fill_kimage() unconditionally populates the kimage with KHO\nmetadata for every kexec image type. When the image is a crash kernel,\nthis can be problematic as the crash kernel can run in a small reserved\nregion and the KHO scratch areas can sit outside it.\nThe crash kernel then faults during kho_memory_init() when it\ntries phys_to_virt() on the KHO FDT address:\n\n  Unable to handle kernel paging request at virtual address xxxxxxxx\n  ...\n    fdt_offset_ptr+...\n    fdt_check_node_offset_+...\n    fdt_first_property_offset+...\n    fdt_get_property_namelen_+...\n    fdt_getprop+...\n    kho_memory_init+...\n    mm_core_init+...\n    start_kernel+...\n\nkho_locate_mem_hole() already skips KHO logic for KEXEC_TYPE_CRASH\nimages, but kho_fill_kimage() was missing the same guard. As\nkho_fill_kimage() is the single point that populates image-\u003ekho.fdt\nand image-\u003ekho.scratch, fixing it here is sufficient for both arm64\nand x86 as the FDT and boot_params path are bailing out when these\nfields are unset."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:40:52.023Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a6ac6721326a75ff2d14c68db05f93b576d8762f"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6715d7ec472a476db17787697a4abda62962284"
        }
      ],
      "title": "kho: skip KHO for crash kernel",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64167",
    "datePublished": "2026-07-19T15:40:52.023Z",
    "dateReserved": "2026-07-19T07:54:57.038Z",
    "dateUpdated": "2026-07-19T15:40:52.023Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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