CVE-2026-82018CWE-636

CVE-2026-82018

Medium · published August 29, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
15.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
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
EPSS
0.00251 · 15.5th percentile
Weakness
CWE-636 · Not Failing Securely ('Failing Open')
Published
2026-08-29T02:16Z
References (4)
https://blog.amberwolf.com/blog/2026/august/thin-client-thin-crypto-overview/ · [email protected]https://kb.igel.com/en/security-safety/current/isn-2026-20-grub-shell-escape-in-igel-os · [email protected]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 · [email protected]https://www.vulncheck.com/advisories/igel-os-12-11-secure-boot-bypass-via-unsigned-igel-conf-file · [email protected]
EPSS history
Timeline
  • 30 AUG 16:19Z
    EPSS moved — → 0%
    epss
  • 28 AUG 21:11Z
    IGEL OS 12 / 11 Secure Boot Bypass via Unsigned igel.conf File
    cvelistv5