# CVE-2026-82018

## Summary

- **CVE ID:** CVE-2026-82018
- **Severity:** MEDIUM
- **CVSS Score:** 6.8 (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)
- **CWE:** CWE-636
- **Published:** Aug 28, 2026
- **Last Modified:** Sep 2, 2026

## 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.

## Affected Products

- IGEL — IGEL OS 12 (12.0.0)
- IGEL — IGEL OS 12 (12.8.3)
- IGEL — IGEL OS 12 (12.9.0)
- IGEL — IGEL OS 11 (11.0.0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 7.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._