Vulnerability in Igel OS 11
CVE-2026-82018
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- kb.igel.com/en/security-safety/current/isn-2026-20-grub-shell-escape-in-igel-os (vendor-advisory, patch)
- blog.amberwolf.com/blog/2026/august/thin-client-thin-crypto-overview/ (technical-description)
- media.defcon.org/DEF CON 34/DEF CON 34 presentations/DEF CON 34 presentations/D…
- www.vulncheck.com/advisories/igel-os-12-11-secure-boot-bypass-via-unsigned-igel… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82018?
- CVE-2026-82018 is a medium-severity vulnerability in Igel OS 11, classified under CWE-636. CVSS score: 6.1/10. Published 2026-08-28.
- How severe is CVE-2026-82018?
- Medium severity. CVSS v3 base score is 6.1 out of 10.