---
id: CVE-2026-81011
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_attrib…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-125
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a34fc329b1895fc8a6eb12099adc47009421ba6a <
    467e53f231f77a1677191b8cdabdaf1448439d55
  - >-
    Linux >= a34fc329b1895fc8a6eb12099adc47009421ba6a <
    436017808c7cbcdb5e49b2142090d4391e3de9a6
  - >-
    Linux >= a34fc329b1895fc8a6eb12099adc47009421ba6a <
    a38127df99ae8b1851560b35b837c9952416143a
  - >-
    Linux >= a34fc329b1895fc8a6eb12099adc47009421ba6a <
    400cbc3ccc88a5ad37cd85056224635ce9eba018
  - >-
    Linux >= a34fc329b1895fc8a6eb12099adc47009421ba6a <
    e0ddfd77c0c320b7d12b6c9169303b140b798775
  - Linux 6.6
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:46:36.444Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-81011'
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'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81011.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-81011'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532502'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-81011'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81011'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-81011.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00125
epssPercentile: 0.02199
scores:
  cna: 7.1
  vendor: 5.5
ingestedAt: '2026-09-14T15:23:07.454Z'
---

## Overview

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.

## Affected

- `Linux >= a34fc329b1895fc8a6eb12099adc47009421ba6a < 467e53f231f77a1677191b8cdabdaf1448439d55`
- `Linux >= a34fc329b1895fc8a6eb12099adc47009421ba6a < 436017808c7cbcdb5e49b2142090d4391e3de9a6`
- `Linux >= a34fc329b1895fc8a6eb12099adc47009421ba6a < a38127df99ae8b1851560b35b837c9952416143a`
- `Linux >= a34fc329b1895fc8a6eb12099adc47009421ba6a < 400cbc3ccc88a5ad37cd85056224635ce9eba018`
- `Linux >= a34fc329b1895fc8a6eb12099adc47009421ba6a < e0ddfd77c0c320b7d12b6c9169303b140b798775`
- `Linux 6.6`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81011.json)