CVE-2026-97450 (GCVE-0-2026-97450)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:04 – Updated: 2026-09-25 05:10
VLAI
Title
ACPICA: validate handler object type in two places
Summary
In the Linux kernel, the following vulnerability has been resolved: ACPICA: validate handler object type in two places ACPICA: validate handler object type in acpi_ev_has_default_handler() and acpi_ev_find_region_handler().
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bfd981d35ed3156414fd35b4fe311d5d25cbfca6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4c977d57a784682dc8c6cce2f9253ef44ec28ae8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c5296da2d516707862f8a2dbb4b515f777e5294f (git)
Affected: 0 , < 6.12.111 (semver)
Affected: 0 , < 6.18.53 (semver)
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Linux Linux Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/acpi/acpica/evhandler.c"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPICA: validate handler object type in two places\n\nACPICA: validate handler object type in acpi_ev_has_default_handler()\nand acpi_ev_find_region_handler()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The malformed AML that leaves a non-ACPI_TYPE_LOCAL_ADDRESS_HANDLER object as common_notify.handler arrives in a DSDT/SSDT. acpi_ev_find_region_handler() is reached from acpi_ev_install_space_handler() via acpi_install_address_space_handler(ACPI_ROOT_OBJECT) in ec_install_handlers()/acpi_ipmi_init(), and from acpi_ev_initialize_region() during acpi_tb_load_namespace(); no network message carries those bytes.\nAC:L - acpi_ev_install_space_handler() skips the DEVICE/PROCESSOR/THERMAL type check for acpi_gbl_root_node, so CopyObject of a Buffer onto `\\` makes obj_desc-\u003ecommon_notify.handler overlay Buffer.aml_start. A later handler install or OperationRegion init walks address_space.next on every run; the table author sets those objects and no race is required.\nPR:N - acpi_bus_init() calls acpi_load_tables() which executes module-level AML, then acpi_initialize_objects() \u2192 acpi_ev_initialize_op_regions() \u2192 acpi_ev_has_default_handler(acpi_gbl_root_node), and ec_install_handlers() calls acpi_install_address_space_handler(ACPI_ROOT_OBJECT) with no capable() check; a compromised DSDT/SSDT needs no Linux account.\nUI:N - Module-level AML runs in acpi_ns_execute_table() during acpi_load_tables(), and acpi_ev_find_region_handler() then runs from acpi_ev_initialize_op_regions() and from EC/IPMI/PCC handler install in boot/probe; that is ordinary power-on with no mount or file-open by a victim.\nS:U - The type-confused walk in acpi_ev_find_region_handler()/acpi_ev_has_default_handler() and the stores in acpi_ev_attach_region() stay inside the host ACPICA operand-object heap and do not cross a KVM/Xen, IOMMU, or sandbox boundary.\nC:H - Without the ACPI_TYPE_LOCAL_ADDRESS_HANDLER check, acpi_ev_find_region_handler() reads address_space.space_id and follows address_space.next from a wrong-typed operand (or from AML bytes overlaying common_notify.handler), an unbounded kernel overread of adjacent heap or attacker-chosen addresses rather than a few header bytes.\nI:H - acpi_ev_initialize_region() passes the type-confused pointer from acpi_ev_find_region_handler() to acpi_ev_attach_region(), which writes region_list and handler links through it; a matching fake space_id makes acpi_ev_address_space_dispatch() later invoke address_space.handler as a function pointer, which is type-confusion control-flow hijack.\nA:H - Walking address_space.next from a non-handler object (the ASAN global-buffer-overflow in AcpiEvFindRegionHandler on issue26.aml) dereferences an invalid pointer and oopses or panics the kernel during acpi_ev_install_space_handler() or acpi_ev_initialize_region()."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T05:10:42.701Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/bfd981d35ed3156414fd35b4fe311d5d25cbfca6"
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          "url": "https://git.kernel.org/stable/c/4c977d57a784682dc8c6cce2f9253ef44ec28ae8"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5296da2d516707862f8a2dbb4b515f777e5294f"
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      ],
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97450",
    "datePublished": "2026-09-24T16:04:06.092Z",
    "dateReserved": "2026-09-24T14:53:16.871Z",
    "dateUpdated": "2026-09-25T05:10:42.701Z",
    "state": "PUBLISHED"
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                "product": "Linux",
                "programFiles": [
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                ],
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPICA: validate handler object type in two places\n\nACPICA: validate handler object type in acpi_ev_has_default_handler()\nand acpi_ev_find_region_handler()."
          }
        ],
        "id": "CVE-2026-97450",
        "lastModified": "2026-09-25T05:17:06.200",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    }
  }
}



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