CVE-2025-47827Known exploitationPublic exploit

Secure Boot bypass via unsigned root filesystem

Published Jun 5, 2025 · Updated Feb 26, 2026

Secure Boot bypass in IGEL OS 10 allows physically proximate attackers to boot an unverified system partition from disk. The igel-flash-driver kernel module accepts a SquashFS root filesystem without verifying its cryptographic signature after signed shim, GRUB, and kernel stages load. Physical access is required to alter the on-disk image, after which the available kexec_load syscall permits replacement of the running kernel with an untrusted one.

CVSS severity4.6
Medium
EPSS probability4.93%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Secure Boot bypass in IGEL OS 10 allows physically proximate attackers to boot an unverified system partition from disk. The igel-flash-driver kernel module accepts a SquashFS root filesystem without verifying its cryptographic signature after signed shim, GRUB, and kernel stages load. Physical access is required to alter the on-disk image, after which the available kexec_load syscall permits replacement of the running kernel with an untrusted one.

The record

CVE
CVE-2025-47827
Published
Jun 5, 2025
Updated
Feb 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-347, T1542.003
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2025Exploitation reportedCISA Known Exploited Vulnerabilities listing
  3. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.4NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.6CISA ADPCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1542.003Bootkit

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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