platform/x86: hp-bioscfg: pass validated element count to package parsers

{
  "id": "c6f72142f05df5decd4892506ec48e08b2d7aa45639a78b9accdff3ec8ea44ad",
  "url": "https://osv.dev/vulnerability/CVE-2026-81011",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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",
    "evidence": "osv:CVE-2026-81011",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-81011",
      "aliases": [
        "CVE-2026-81011"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a34fc329b1895fc8a6eb12099adc47009421ba6a"
                },
                {
                  "fixed": "467e53f231f77a1677191b8cdabdaf1448439d55"
                },
                {
                  "fixed": "436017808c7cbcdb5e49b2142090d4391e3de9a6"
                },
                {
                  "fixed": "a38127df99ae8b1851560b35b837c9952416143a"
                },
                {
                  "fixed": "400cbc3ccc88a5ad37cd85056224635ce9eba018"
                },
                {
                  "fixed": "e0ddfd77c0c320b7d12b6c9169303b140b798775"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81011.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.6.0"
                },
                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.109"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.50"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81011.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.745390659Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/400cbc3ccc88a5ad37cd85056224635ce9eba018",
        "https://git.kernel.org/stable/c/436017808c7cbcdb5e49b2142090d4391e3de9a6",
        "https://git.kernel.org/stable/c/467e53f231f77a1677191b8cdabdaf1448439d55",
        "https://git.kernel.org/stable/c/a38127df99ae8b1851560b35b837c9952416143a",
        "https://git.kernel.org/stable/c/e0ddfd77c0c320b7d12b6c9169303b140b798775",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81011.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-81011",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81011.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-81011",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490257,
  "published_at": "2026-09-11T19:43:01.422+00:00"
}