---
id: CVE-2026-81018
title: 'platform/x86: think-lmi: Free system certificate signatures'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  platform/x86: think-lmi: Free system certificate signatures

  Multi-certificate support also allows the system authentication object
  to store ->signature and ->save_sign…
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-772
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5dcb5ef125907d09806509a9db8c6705041e0026 <
    9c28adde051fe76a7754856d0a414ab89adcaa4d
  - >-
    Linux >= 5dcb5ef125907d09806509a9db8c6705041e0026 <
    abbcc0354108cf47a6055b951182bf73520d0363
  - >-
    Linux >= 5dcb5ef125907d09806509a9db8c6705041e0026 <
    abca989604f60fe29d7170431f819e28ec7d868a
  - Linux 6.13
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:46:43.567Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-81018'
references:
  - url: 'https://git.kernel.org/stable/c/9c28adde051fe76a7754856d0a414ab89adcaa4d'
  - url: 'https://git.kernel.org/stable/c/abbcc0354108cf47a6055b951182bf73520d0363'
  - url: 'https://git.kernel.org/stable/c/abca989604f60fe29d7170431f819e28ec7d868a'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81018.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-81018'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532431'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-81018'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81018'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-81018.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00159
epssPercentile: 0.05017
ingestedAt: '2026-09-14T00:35:28.531Z'
---

## Overview

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

platform/x86: think-lmi: Free system certificate signatures

Multi-certificate support also allows the system authentication object
to store ->signature and ->save_signature, which leak when the driver is
removed. Free the signatures to avoid leaking memory.

## Affected

- `Linux >= 5dcb5ef125907d09806509a9db8c6705041e0026 < 9c28adde051fe76a7754856d0a414ab89adcaa4d`
- `Linux >= 5dcb5ef125907d09806509a9db8c6705041e0026 < abbcc0354108cf47a6055b951182bf73520d0363`
- `Linux >= 5dcb5ef125907d09806509a9db8c6705041e0026 < abca989604f60fe29d7170431f819e28ec7d868a`
- `Linux 6.13`

## 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-2026-81018.json)