CVE-2026-89588 (GCVE-0-2026-89588)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:49
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ACPI: APEI: GHES: fix ARM section length accounting after header In ghes_handle_arm_hw_error(), after skipping the cper_sec_proc_arm header with (err + 1), the remaining length was reduced by sizeof(err) (pointer size) instead of sizeof(*err) (structure size). That overestimates the bytes left for cper_arm_err_info records and can let the parser read past the CPER section when err_info_num is large enough relative to error_data_length. Use sizeof(*err) so the length accounting matches the pointer advance and the earlier sizeof(*err) size check.
References
Impacted products
Vendor Product Version
Linux Linux Version: 242c652849d979d0133c315a42d9acea0ff88390
Version: 136093ba4161e0080088abff48273f6830a47766
Version: 87880af2d24e62a84ed19943dbdd524f097172f2
Version: 87880af2d24e62a84ed19943dbdd524f097172f2
Version: db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd
Version: 6.12.75   ≤
Version: 6.18.16   ≤
Version: 6.19.6   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/acpi/apei/ghes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "5ff385e9403e87ae33f65b8c38698d3b1e92cfde",
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              "versionType": "git"
            },
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              "status": "affected",
              "version": "87880af2d24e62a84ed19943dbdd524f097172f2",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "87880af2d24e62a84ed19943dbdd524f097172f2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.109",
              "status": "affected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.50",
              "status": "affected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThan": "6.20",
              "status": "affected",
              "version": "6.19.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/acpi/apei/ghes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "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": "6.12.109",
                  "versionStartIncluding": "6.12.75",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.18.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.19.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: APEI: GHES: fix ARM section length accounting after header\n\nIn ghes_handle_arm_hw_error(), after skipping the cper_sec_proc_arm\nheader with (err + 1), the remaining length was reduced by sizeof(err)\n(pointer size) instead of sizeof(*err) (structure size).\n\nThat overestimates the bytes left for cper_arm_err_info records and can\nlet the parser read past the CPER section when err_info_num is large\nenough relative to error_data_length.\n\nUse sizeof(*err) so the length accounting matches the pointer advance\nand the earlier sizeof(*err) size check."
        }
      ],
      "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 - GHES ARM processor CPER sections are consumed on the local host from ACPI APEI notifications (SCI, GSIV, GPIO, SEA, SDEI, NMI, or poll) via ghes_proc()/ghes_proc_in_irq() into ghes_handle_arm_hw_error(); there is no network or radio path. The most severe case is a local ARM server or VM whose firmware delivers a crafted ARM section.\nAC:L - After skipping the cper_sec_proc_arm header, remaining length was reduced by sizeof(pointer) (8) instead of sizeof(*err) (40), over-counting by 32 bytes. A recoverable ARM section with err_info_num large relative to error_data_length then deterministically parses past the section; no race or attacker-uncontrollable layout is required.\nPR:N - ghes_do_proc() and ghes_handle_arm_hw_error() apply no capability or credential check; firmware-first RAS notifications are processed in IRQ, NMI, or kworker context without a host login. Compromised ACPI/SDEI firmware or a BMC-written GHES status block needs no Linux account, matching other firmware-sourced kernel CNA scores.\nUI:N - GHES consumes the CPER record automatically on the notification and irq_work path. No victim action such as mounting a filesystem, opening a device node, or confirming a prompt is required.\nS:U - The out-of-bounds parse and any memory_failure() side effects remain in the host kernel that handles GHES. This is not a KVM/Xen guest-to-host escape or an IOMMU/DMA boundary bypass.\nC:H - The inflated remaining length lets the parser read a cper_arm_err_info object past the CPER section. On the SEA/NMI path the estatus node is allocated to the exact CPER size, so this is a kernel gen_pool/heap out-of-bounds read of adjacent objects, including pointers.\nI:H - Out-of-bounds err_info fields are interpreted as a processor cache-error record; if type and validation_bits match, ghes_do_memory_failure() poisons err_info-\u003ephysical_fault_addr taken from adjacent memory. Firmware-controlled neighboring bytes thus yield a kernel integrity primitive via HWPoison of arbitrary PFNs.\nA:H - Reading past an exact-sized ghes_estatus_pool node can hit unmapped memory and oops, as the related ARM GHES parser already did on QEMU. memory_failure() of kernel pages or a large err_info_num walk in IRQ context can panic or hang, and notifications can be repeated."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:49:20.945Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5ff385e9403e87ae33f65b8c38698d3b1e92cfde"
        },
        {
          "url": "https://git.kernel.org/stable/c/452eb28e03015abec6d4bf6488ee567706ade4e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/b48b613073c3d652cb1823c15d16f7067cf4cee4"
        },
        {
          "url": "https://git.kernel.org/stable/c/903308ea40adf0577d82eab69882faf8836326ce"
        }
      ],
      "title": "ACPI: APEI: GHES: fix ARM section length accounting after header",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89588",
    "datePublished": "2026-09-11T19:44:52.842Z",
    "dateReserved": "2026-09-11T19:38:34.729Z",
    "dateUpdated": "2026-10-19T08:49:20.945Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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