---
id: CVE-2026-82018
title: >-
  IGEL OS 12 before 12.9.0, 12.8.3 LTS and IGEL OS 11 before 11.11.150 contain a
  secure boot bypass vulnerability in the GRUB boot stage that allows physically
  present attackers to gain unauthorized root access by placing an unsigned
  empty…
summary: >-
  IGEL OS 12 before 12.9.0, 12.8.3 LTS and IGEL OS 11 before 11.11.150 contain a
  secure boot bypass vulnerability in the GRUB boot stage that allows physically
  present attackers to gain unauthorized root access by placing an unsigned
  empty…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-636
published: '2026-08-28'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:44:42.207'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82018'
references:
  - url: >-
      https://blog.amberwolf.com/blog/2026/august/thin-client-thin-crypto-overview/
    label: disclosure@vulncheck.com
  - url: >-
      https://kb.igel.com/en/security-safety/current/isn-2026-20-grub-shell-escape-in-igel-os
    label: disclosure@vulncheck.com
  - url: >-
      https://media.defcon.org/DEF%20CON%2034/DEF%20CON%2034%20presentations/DEF%20CON%2034%20presentations/DEF%20CON%2034%20-%20Darren%20McDonald%20-%20Thin%20Client%20Thin%20Crypto%20-%20Bypassing%20Full-Desk%20Encryption%20Across%20Three%20Major%20Thin%20Clients%20Vendors%20without%20Breaking%20a%20Ci.pdf
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/igel-os-12-11-secure-boot-bypass-via-unsigned-igel-conf-file
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00251
epssPercentile: 0.1462
ingestedAt: '2026-09-24T20:51:40.239Z'
---

## Overview

IGEL OS 12 before 12.9.0, 12.8.3 LTS and IGEL OS 11 before 11.11.150 contain a secure boot bypass vulnerability in the GRUB boot stage that allows physically present attackers to gain unauthorized root access by placing an unsigned empty file named igel.conf on a partition. Attackers can exploit GRUB's fail-open signature verification behavior to drop into an interactive GRUB prompt, then boot the device's own kernel with additional command-line arguments to obtain a root shell with the disk unlocked while leaving TPM PCR values unaltered.

## Remediation

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