---
id: CVE-2026-81014
title: 'platform/x86: hp-bioscfg: fix heap OOB read in sk_store() and kek_store()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  platform/x86: hp-bioscfg: fix heap OOB read in sk_store() and kek_store()

  sk_store() and kek_store() strip a trailing newline from the sysfs
  write before allocating th…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-125
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b2715aa2e1352c0060b9dcba57a2e465bbfbcd68 <
    81db79fed115640736188e56595b1e9aec317d5b
  - >-
    Linux >= b2715aa2e1352c0060b9dcba57a2e465bbfbcd68 <
    4c6374dcb270d12907b880cf82a5a5ef21785fc3
  - >-
    Linux >= b2715aa2e1352c0060b9dcba57a2e465bbfbcd68 <
    7cd8fe01aba303a2382db0966eb6c8ab41d5f3c2
  - >-
    Linux >= b2715aa2e1352c0060b9dcba57a2e465bbfbcd68 <
    67b60703d7d8af1ca0e49f72e1bdb1ccecd41b5b
  - >-
    Linux >= b2715aa2e1352c0060b9dcba57a2e465bbfbcd68 <
    a7508c7959ff8d037327d377ed21a9c0eabe4674
  - Linux 6.6
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:46:39.559Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-81014'
references:
  - url: 'https://git.kernel.org/stable/c/81db79fed115640736188e56595b1e9aec317d5b'
  - url: 'https://git.kernel.org/stable/c/4c6374dcb270d12907b880cf82a5a5ef21785fc3'
  - url: 'https://git.kernel.org/stable/c/7cd8fe01aba303a2382db0966eb6c8ab41d5f3c2'
  - url: 'https://git.kernel.org/stable/c/67b60703d7d8af1ca0e49f72e1bdb1ccecd41b5b'
  - url: 'https://git.kernel.org/stable/c/a7508c7959ff8d037327d377ed21a9c0eabe4674'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81014.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-81014'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532503'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-81014'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81014'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-81014.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00168
epssPercentile: 0.06018
ingestedAt: '2026-09-14T15:23:07.454Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

platform/x86: hp-bioscfg: fix heap OOB read in sk_store() and kek_store()

sk_store() and kek_store() strip a trailing newline from the sysfs
write before allocating the key buffer:

	length = count;
	if (buf[length - 1] == '\n')
		length--;
	bioscfg_drv.spm_data.signing_key = kmemdup(buf, length, GFP_KERNEL);

but then pass the original "count" (not "length") as the copy size to
hp_wmi_perform_query(), which memcpy()s that many bytes out of the
"length"-sized allocation, reading one byte past it whenever the write
ends in a newline, the normal case for a shell "echo" into sysfs.

KASAN confirms this directly:

  BUG: KASAN: slab-out-of-bounds in hp_wmi_perform_query+0x1e9/0x460 [hp_bioscfg]
  Read of size 28 at addr ffff88813c8e2b80 by task python3/16022
  ...
  sk_store+0xa7/0x240 [hp_bioscfg]
  kernfs_fop_write_iter+0x3e1/0x5d0
  ...
  The buggy address is located 0 bytes inside of
  allocated 27-byte region [ffff88813c8e2b80, ffff88813c8e2b9b)

Reproduced identically for kek_store, and at multiple write sizes
(28, 57, 201 bytes), each time reading exactly one byte past a
kmemdup() allocation one byte smaller than the write.

Fix by passing "length" instead of "count" to hp_wmi_perform_query()
in both functions.

## Affected

- `Linux >= b2715aa2e1352c0060b9dcba57a2e465bbfbcd68 < 81db79fed115640736188e56595b1e9aec317d5b`
- `Linux >= b2715aa2e1352c0060b9dcba57a2e465bbfbcd68 < 4c6374dcb270d12907b880cf82a5a5ef21785fc3`
- `Linux >= b2715aa2e1352c0060b9dcba57a2e465bbfbcd68 < 7cd8fe01aba303a2382db0966eb6c8ab41d5f3c2`
- `Linux >= b2715aa2e1352c0060b9dcba57a2e465bbfbcd68 < 67b60703d7d8af1ca0e49f72e1bdb1ccecd41b5b`
- `Linux >= b2715aa2e1352c0060b9dcba57a2e465bbfbcd68 < a7508c7959ff8d037327d377ed21a9c0eabe4674`
- `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-2026-81014.json)