CVE-2026-92522 (GCVE-0-2026-92522)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-09-18 17:55
VLAI
Title
ACPI: processor: validate MADT IOAPIC entry bounds
Summary
In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: validate MADT IOAPIC entry bounds The IOAPIC hotplug lookup parses both MADT and _MAT records directly. The MADT walk previously used a subtable's declared length to advance the cursor after only locating a generic header. The _MAT path likewise passed a generic header to the IOAPIC helper. Validate that a current record has a complete generic header, that its declared length is contained in the available record range, and that a typed IOAPIC record contains the full fixed IOAPIC body before reading its fields. Use the same relation for both MADT and _MAT provider paths.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ecf5636dcd59cd5508641f995cc4c2bafedbb995 , < 5601bd81bc290a724ed47797d22c16cba4d7ed9f (git)
Affected: ecf5636dcd59cd5508641f995cc4c2bafedbb995 , < ff82e3374e9103d046b2a82f4315d9a422ff097d (git)
Affected: ecf5636dcd59cd5508641f995cc4c2bafedbb995 , < 2a5520065e76000f8c979d3d7b3d861ccaaecf1e (git)
Affected: ecf5636dcd59cd5508641f995cc4c2bafedbb995 , < 8e67b58c04990817ac2dbf8ae03353be6a358cd4 (git)
Affected: ecf5636dcd59cd5508641f995cc4c2bafedbb995 , < 74d84320f8e37955eb286a7777843d554e6e75b2 (git)
Affected: ecf5636dcd59cd5508641f995cc4c2bafedbb995 , < 4d8ecaa332c163f2b44aa5027bf061950b71b5f3 (git)
Affected: ecf5636dcd59cd5508641f995cc4c2bafedbb995 , < 355bee5f11acb116cd256588631b4028ca562646 (git)
Affected: ecf5636dcd59cd5508641f995cc4c2bafedbb995 , < 2c50ffdc73f3a70d745d249f509fc290754121e6 (git)
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Linux Linux Affected: 4.0
Unaffected: 0 , < 4.0 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: processor: validate MADT IOAPIC entry bounds\n\nThe IOAPIC hotplug lookup parses both MADT and _MAT records directly.\nThe MADT walk previously used a subtable\u0027s declared length to advance\nthe cursor after only locating a generic header.  The _MAT path likewise\npassed a generic header to the IOAPIC helper.\n\nValidate that a current record has a complete generic header, that its\ndeclared length is contained in the available record range, and that a\ntyped IOAPIC record contains the full fixed IOAPIC body before reading\nits fields.  Use the same relation for both MADT and _MAT provider\npaths."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
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          "scenarios": [
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              "value": "AV:L - The triggering bytes are MADT IO_APIC subtable headers (hdr-\u003elength/type) and _MAT buffers parsed by parse_madt_ioapic_entry()/parse_mat_ioapic_entry() from acpi_get_ioapic_id(), called by acpi_register_ioapic() via handle_ioapic_add() during pcibios_assign_resources() and acpi_pci_root_add() hotadd. They arrive from firmware or a hypervisor ACPI blob, not a network protocol message.\nAC:L - A MADT subtable with length 0 makes parse_madt_ioapic_entry() add hdr-\u003elength each iteration and never exit. A type-ACPI_MADT_TYPE_IO_APIC record whose length is only sizeof(acpi_subtable_header) makes get_ioapic_id() read the 12-byte acpi_madt_io_apic body past the record. Both are deterministic with no race.\nPR:N - acpi_get_ioapic_id() runs from fs_initcall(pcibios_assign_resources) through pci_assign_unassigned_resources()-\u003eacpi_ioapic_add() with no capable() or credential check. A crafted MADT from get_madt_table() or a _MAT buffer from acpi_evaluate_object() is consumed automatically; no Linux account or user-namespace capability is required.\nUI:N - After the MADT/_MAT is in place, pcibios_assign_resources() and acpi_pci_root_add() (hotadd when system_state==SYSTEM_RUNNING) walk ACPI0009/ACPI000A devices in handle_ioapic_add() and call acpi_register_ioapic() with no victim mount, open, or other interactive action.\nS:U - get_ioapic_id() over-reads and parse_madt_ioapic_entry() hangs inside the same kernel that owns the MADT mapping and the _MAT ACPI buffer. This is not a KVM guest-to-host escape, IOMMU/DMA bypass, or sandbox crossing.\nC:L - get_ioapic_id() reads ioapic-\u003eid, ioapic-\u003eaddress, and ioapic-\u003eglobal_irq_base from a 12-byte acpi_madt_io_apic while only a 2-byte acpi_subtable_header was shown to fit in the MADT range or _MAT obj-\u003ebuffer.length. That is a strictly bounded few-byte over-read, not an arbitrary kernel read.\nI:L - On a gsi_base match, get_ioapic_id() writes the over-read ioapic-\u003eid into *ioapic_id, and acpi_register_ioapic() passes it to mp_register_ioapic() which stores it in ioapics[].mp_config.apicid. That is limited IRQ metadata modification, not an out-of-bounds write or control-flow hijack primitive.\nA:H - parse_madt_ioapic_entry() infinite-loops when hdr-\u003elength is 0, hanging fs_initcall(pcibios_assign_resources) or PCI-root hotplug. get_ioapic_id()\u0027s 12-byte read past a MADT mapping or _MAT heap buffer can also oops if the following bytes are unmapped."
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        {
          "url": "https://git.kernel.org/stable/c/2c50ffdc73f3a70d745d249f509fc290754121e6"
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      "title": "ACPI: processor: validate MADT IOAPIC entry bounds",
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    "cveId": "CVE-2026-92522",
    "datePublished": "2026-09-17T16:10:28.823Z",
    "dateReserved": "2026-09-16T12:21:13.874Z",
    "dateUpdated": "2026-09-18T17:55:37.542Z",
    "state": "PUBLISHED"
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      "date": "2026-09-30",
      "epss": "0.00184",
      "percentile": "0.07203"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-92522",
      "id": "msrc_CVE-2026-92522",
      "initial_release_date": "2026-09-19T01:07:42.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ACPI: processor: validate MADT IOAPIC entry bounds",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-92522.json",
      "version": "4"
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      "cve": {
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          {
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: processor: validate MADT IOAPIC entry bounds\n\nThe IOAPIC hotplug lookup parses both MADT and _MAT records directly.\nThe MADT walk previously used a subtable\u0027s declared length to advance\nthe cursor after only locating a generic header.  The _MAT path likewise\npassed a generic header to the IOAPIC helper.\n\nValidate that a current record has a complete generic header, that its\ndeclared length is contained in the available record range, and that a\ntyped IOAPIC record contains the full fixed IOAPIC body before reading\nits fields.  Use the same relation for both MADT and _MAT provider\npaths."
          }
        ],
        "id": "CVE-2026-92522",
        "lastModified": "2026-09-18T18:18:14.130",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.3,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 4.7,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-17T17:17:55.150",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2a5520065e76000f8c979d3d7b3d861ccaaecf1e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "url": "https://git.kernel.org/stable/c/5601bd81bc290a724ed47797d22c16cba4d7ed9f"
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            "url": "https://git.kernel.org/stable/c/74d84320f8e37955eb286a7777843d554e6e75b2"
          },
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ff82e3374e9103d046b2a82f4315d9a422ff097d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Tags
Taxonomy of the tags.





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.



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.