IGEL OS 12 before 12.7.6 and IGEL OS 11 before 11.11.150 contain a boot registry parameter injection vulnerability that allows attackers with physical access to execute arbitrary Linux loader parameters by writing to an unencrypted and unsigned configuration area read by the signed bootloader. Attackers can inject malicious kernel command line parameters that execute with boot environment privileges without triggering TPM PCR measurement failures, as the attack does not modify the measured boot code.
Attack Parameters
Attack Vector
Physical
Requires physical access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://blog.amberwolf.com/blog/2026/august/thin-client-thin-crypto-overview/
disclosure@vulncheck.com
https://github.com/AmberWolfCyber/DEFCON34-ThinClientThinCrypto/blob/main/scrip…
disclosure@vulncheck.com
https://kb.igel.com/en/security-safety/current/isn-2026-19-code-execution-via-b…
disclosure@vulncheck.com
https://media.defcon.org/DEF%20CON%2034/DEF%20CON%2034%20presentations/DEF%20CO…
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/igel-os-12-11-boot-registry-parameter-inje…
disclosure@vulncheck.com