CVE-2026-81011 (GCVE-0-2026-81011)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-19 08:46
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: platform/x86: hp-bioscfg: pass validated element count to package parsers The per-type package parsers are handed the wrong element count. hp_init_bios_package_attribute() validates obj->package.count and then calls one of the five hp_populate_*_package_data() wrappers (string, integer, enumeration, ordered list, password). Each wrapper forwards a count to its hp_populate_*_elements_from_package() parser, but instead of forwarding the validated obj->package.count it derives the count from elements[0]. elements[0] is the NAME field and is always an ACPI_TYPE_STRING, so reading ->package.count from it in fact reads ->string.length through the union acpi_object. The parsers thus bound themselves against the length of the name string rather than against the real number of elements in the package. This is safe today because hp_init_bios_package_attribute() refuses any package that has fewer than the type's element count, so a parser only ever runs on a full package and never reads past it regardless of the bogus bound. An upcoming change relaxes that check to accept shorter packages. Once a parser can receive fewer elements than its per-type count, a bound taken from the name length no longer reflects the array size, and the "elem < count" loop conditions and "elem + n >= count" sub-loop guards read past the end of elements[] - an out-of-bounds heap read. Forward the validated obj->package.count to every *_package_data() wrapper so the parsers bound themselves against the real package size. This does not change behaviour for the packages that enumerate correctly today and is a prerequisite for accepting shorter packages safely.
References
Impacted products
Vendor Product Version
Linux Linux Version: a34fc329b1895fc8a6eb12099adc47009421ba6a
Version: a34fc329b1895fc8a6eb12099adc47009421ba6a
Version: a34fc329b1895fc8a6eb12099adc47009421ba6a
Version: a34fc329b1895fc8a6eb12099adc47009421ba6a
Version: a34fc329b1895fc8a6eb12099adc47009421ba6a
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/hp/hp-bioscfg/bioscfg.c",
            "drivers/platform/x86/hp/hp-bioscfg/bioscfg.h",
            "drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c",
            "drivers/platform/x86/hp/hp-bioscfg/int-attributes.c",
            "drivers/platform/x86/hp/hp-bioscfg/order-list-attributes.c",
            "drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c",
            "drivers/platform/x86/hp/hp-bioscfg/string-attributes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "467e53f231f77a1677191b8cdabdaf1448439d55",
              "status": "affected",
              "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
              "versionType": "git"
            },
            {
              "lessThan": "a38127df99ae8b1851560b35b837c9952416143a",
              "status": "affected",
              "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
              "versionType": "git"
            },
            {
              "lessThan": "e0ddfd77c0c320b7d12b6c9169303b140b798775",
              "status": "affected",
              "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/hp/hp-bioscfg/bioscfg.c",
            "drivers/platform/x86/hp/hp-bioscfg/bioscfg.h",
            "drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c",
            "drivers/platform/x86/hp/hp-bioscfg/int-attributes.c",
            "drivers/platform/x86/hp/hp-bioscfg/order-list-attributes.c",
            "drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c",
            "drivers/platform/x86/hp/hp-bioscfg/string-attributes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "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": "6.6.157",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: hp-bioscfg: pass validated element count to package parsers\n\nThe per-type package parsers are handed the wrong element count.\n\nhp_init_bios_package_attribute() validates obj-\u003epackage.count and then\ncalls one of the five hp_populate_*_package_data() wrappers (string,\ninteger, enumeration, ordered list, password). Each wrapper forwards a\ncount to its hp_populate_*_elements_from_package() parser, but instead\nof forwarding the validated obj-\u003epackage.count it derives the count\nfrom elements[0]. elements[0] is the NAME field and is always an\nACPI_TYPE_STRING, so reading -\u003epackage.count from it in fact reads\n-\u003estring.length through the union acpi_object. The parsers thus bound\nthemselves against the length of the name string rather than against\nthe real number of elements in the package.\n\nThis is safe today because hp_init_bios_package_attribute() refuses any\npackage that has fewer than the type\u0027s element count, so a parser only\never runs on a full package and never reads past it regardless of the\nbogus bound.\n\nAn upcoming change relaxes that check to accept shorter packages. Once\na parser can receive fewer elements than its per-type count, a bound\ntaken from the name length no longer reflects the array size, and the\n\"elem \u003c count\" loop conditions and \"elem + n \u003e= count\" sub-loop guards\nread past the end of elements[] - an out-of-bounds heap read.\n\nForward the validated obj-\u003epackage.count to every *_package_data()\nwrapper so the parsers bound themselves against the real package size.\nThis does not change behaviour for the packages that enumerate\ncorrectly today and is a prerequisite for accepting shorter packages\nsafely."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The hp-bioscfg package parsers run during local driver initialization on ACPI/WMI objects fetched by wmi_query_block(); there is no network, adjacent-radio, or USB/peripheral path into this code.\nAC:L - A NAME whose string.length exceeds the real package.count makes the nested elem+n bounds and outer elem\u003ccount loops walk past elements[] whenever a multi-element field such as PREREQUISITES is present; a crafted or shortened firmware package triggers that over-read deterministically, with no race or attacker-uncontrollable layout.\nPR:L - hp-bioscfg autoloads on HP WMI GUIDs, and parsed fields are copied into world-readable sysfs attributes under firmware-attributes/hp-bioscfg; an ordinary local user can read that metadata, and no capability or user-namespace gate protects the path.\nUI:N - Parsing occurs in hp_init()/hp_init_bios_attributes() on module load or built-in init; exploitation does not require a victim to open a file, mount a filesystem, or take any other action.\nS:U - The out-of-bounds heap read, any resulting kernel-memory disclosure, and any oops remain inside the same kernel security authority; this is not a VM, IOMMU, or sandbox escape.\nC:H - Out-of-bounds union acpi_object slots are treated as STRING objects, so hp_convert_hexstr_to_str() follows an OOB pointer and length and copies the result into sysfs-visible buffers, yielding an unbounded kernel read rather than a few-byte leak.\nI:N - The flaw is an out-of-bounds read; parsed values are stored through bounded strscpy and scalar assignment into fixed-size driver fields, with no OOB write or control-flow hijack primitive.\nA:H - An out-of-bounds descriptor with a bogus string.pointer is dereferenced by hp_convert_hexstr_to_str(), which causes a kernel oops or panic during driver initialization."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:46:36.444Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/467e53f231f77a1677191b8cdabdaf1448439d55"
        },
        {
          "url": "https://git.kernel.org/stable/c/436017808c7cbcdb5e49b2142090d4391e3de9a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/a38127df99ae8b1851560b35b837c9952416143a"
        },
        {
          "url": "https://git.kernel.org/stable/c/400cbc3ccc88a5ad37cd85056224635ce9eba018"
        },
        {
          "url": "https://git.kernel.org/stable/c/e0ddfd77c0c320b7d12b6c9169303b140b798775"
        }
      ],
      "title": "platform/x86: hp-bioscfg: pass validated element count to package parsers",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-81011",
    "datePublished": "2026-09-11T19:43:01.422Z",
    "dateReserved": "2026-08-26T14:34:25.813Z",
    "dateUpdated": "2026-10-19T08:46:36.444Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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