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

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-81011

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-81011

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
        "lessThan": "467e53f231f77a1677191b8cdabdaf1448439d55",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
        "lessThan": "436017808c7cbcdb5e49b2142090d4391e3de9a6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
        "lessThan": "a38127df99ae8b1851560b35b837c9952416143a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
        "lessThan": "400cbc3ccc88a5ad37cd85056224635ce9eba018",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a34fc329b1895fc8a6eb12099adc47009421ba6a",
        "lessThan": "e0ddfd77c0c320b7d12b6c9169303b140b798775",
        "versionType": "git"
      }
    ],
    "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"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "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"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-81011

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34966 · Revision 1
Added to Heist Feed
Publisher date
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