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CVE-2026-81011 (GCVE-0-2026-81011)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 11:59
VLAI
Title
platform/x86: hp-bioscfg: pass validated element count to package parsers
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.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a34fc329b1895fc8a6eb12099adc47009421ba6a , < 467e53f231f77a1677191b8cdabdaf1448439d55 (git)
Affected: a34fc329b1895fc8a6eb12099adc47009421ba6a , < 436017808c7cbcdb5e49b2142090d4391e3de9a6 (git)
Affected: a34fc329b1895fc8a6eb12099adc47009421ba6a , < a38127df99ae8b1851560b35b837c9952416143a (git)
Affected: a34fc329b1895fc8a6eb12099adc47009421ba6a , < 400cbc3ccc88a5ad37cd85056224635ce9eba018 (git)
Affected: a34fc329b1895fc8a6eb12099adc47009421ba6a , < e0ddfd77c0c320b7d12b6c9169303b140b798775 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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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"
          ],
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            "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",
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          "versions": [
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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\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": [
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              "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": "2026-09-14T11:59:43.878Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/467e53f231f77a1677191b8cdabdaf1448439d55"
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          "url": "https://git.kernel.org/stable/c/436017808c7cbcdb5e49b2142090d4391e3de9a6"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/e0ddfd77c0c320b7d12b6c9169303b140b798775"
        }
      ],
      "title": "platform/x86: hp-bioscfg: pass validated element count to package parsers",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-81011",
    "datePublished": "2026-09-11T19:43:01.422Z",
    "dateReserved": "2026-08-26T14:34:25.813Z",
    "dateUpdated": "2026-09-14T11:59:43.878Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-09-17",
      "epss": "0.00125",
      "percentile": "0.02538"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
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                "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"
                ],
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                "vendor": "Linux",
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                "product": "Linux",
                "programFiles": [
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                  "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": [
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        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-81011",
        "lastModified": "2026-09-14T13:18:55.480",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
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              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-11T20:19:09.927",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/400cbc3ccc88a5ad37cd85056224635ce9eba018"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/436017808c7cbcdb5e49b2142090d4391e3de9a6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/467e53f231f77a1677191b8cdabdaf1448439d55"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a38127df99ae8b1851560b35b837c9952416143a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e0ddfd77c0c320b7d12b6c9169303b140b798775"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T21:17:47+00:00",
      "cve": "CVE-2026-81011",
      "id": "CVE-2026-81011",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_not_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: platform/x86: hp-bioscfg: pass validated element count to package parsers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81011.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:04:05Z",
      "cve": "CVE-2026-81011",
      "id": "CVE-2026-81011",
      "initial_release_date": "2026-09-12T16:35:36Z",
      "product_status:known_affected": "55",
      "product_status:known_not_affected": "298",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-81011",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-81011.json",
      "version": "5"
    }
  }
}



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  • 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.


Detection rules are retrieved from Rulezet.


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.