Vulnerability-Lookup

GHSA-7C38-49CX-FJVW

Vulnerability from github – Published: 2026-08-29 00:31 – Updated: 2026-08-29 00:31

Details

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.

Severity

6.1 (Medium)


                  
                    CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

6.8 (Medium)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-82018"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-636"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T22:16:55Z",
    "severity": "MODERATE"
  },
  "details": "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\u0027s fail-open signature verification behavior to drop into an interactive GRUB prompt, then boot the device\u0027s own kernel with additional command-line arguments to obtain a root shell with the disk unlocked while leaving TPM PCR values unaltered.",
  "id": "GHSA-7c38-49cx-fjvw",
  "modified": "2026-08-29T00:31:03Z",
  "published": "2026-08-29T00:31:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82018"
    },
    {
      "type": "WEB",
      "url": "https://blog.amberwolf.com/blog/2026/august/thin-client-thin-crypto-overview"
    },
    {
      "type": "WEB",
      "url": "https://kb.igel.com/en/security-safety/current/isn-2026-20-grub-shell-escape-in-igel-os"
    },
    {
      "type": "WEB",
      "url": "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"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/igel-os-12-11-secure-boot-bypass-via-unsigned-igel-conf-file"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-82018 (GCVE-0-2026-82018)

Vulnerability from cvelistv5 – Published: 2026-08-28 21:11 – Updated: 2026-09-02 18:46

Title

IGEL OS 12 / 11 Secure Boot Bypass via Unsigned igel.conf File

Summary

Severity

6.8 (Medium)


                        
                          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

6.1 (Medium)


                        
                          CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 18:46 UTC

CWE

CWE-636 - Not Failing Securely ('Failing Open')

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://kb.igel.com/en/security-safety/current/is…	vendor-advisorypatch
https://blog.amberwolf.com/blog/2026/august/thin-…	technical-description
https://media.defcon.org/DEF%20CON%2034/DEF%20CON…
https://www.vulncheck.com/advisories/igel-os-12-1…	third-party-advisory

Impacted products

2 products

Vendor	Product	Version
IGEL	IGEL OS 12	Affected: 12.0.0 , ≤ 12.8.2 (semver) Unaffected: 12.8.3 (semver) Unaffected: 12.9.0 (semver)
IGEL	IGEL OS 11	Affected: 11.0.0 , < 11.11.150 (semver)

Date Public

2026-06-17 00:00

Credits

Darren McDonald from AmberWolf

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-82018",
                "options": [
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                    "Exploitation": "none"
                  },
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-02T18:46:35.490048Z",
                "version": "2.0.3"
              },
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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      }
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    "cna": {
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            },
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              "status": "unaffected",
              "version": "12.8.3",
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            {
              "status": "unaffected",
              "version": "12.9.0",
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            }
          ]
        },
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          "versions": [
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              "version": "11.0.0",
              "versionType": "semver"
            }
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      ],
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          "type": "finder",
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      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "attackVector": "PHYSICAL",
            "baseScore": 6.8,
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            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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      "providerMetadata": {
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        },
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          "url": "https://blog.amberwolf.com/blog/2026/august/thin-client-thin-crypto-overview/"
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        {
          "name": "DEF CON 34 Presentation",
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        },
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        "discovery": "EXTERNAL"
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    "datePublished": "2026-08-28T21:11:24.911Z",
    "dateReserved": "2026-08-27T21:39:20.459Z",
    "dateUpdated": "2026-09-02T18:46:41.967Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-7C38-49CX-FJVW

CVE-2026-82018 (GCVE-0-2026-82018)

Tags

Sightings

Nomenclature

Related by attack behaviour