IGEL OS Boot Signature Verification Bypass
CVE-2025-47827 is a Secure Boot bypass in IGEL OS versions before 11. The flaw is caused by improper cryptographic signature verification in the igel-flash-driver kernel module. Because the module does not correctly validate the signature protecting the booted filesystem image, an attacker can supply a crafted SquashFS image and have an unverified root filesystem mounted during boot. This breaks the intended Secure Boot chain of trust on affected devices. Public reporting and the associated proof-of-concept indicate the issue can be leveraged to boot with an attacker-controlled root filesystem and, from that trusted boot context, load or transition to an untrusted kernel, including via kexec, defeating platform boot integrity guarantees.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (PoC) exploit for CVE-2025-47827, a Secure Boot bypass vulnerability in IGEL OS 10 (before v11). The vulnerability arises from improper cryptographic signature verification in the igel-flash-driver kernel module, allowing an attacker to boot a malicious root filesystem from an unverified SquashFS image. The exploit leverages the kexec syscall to replace the running kernel with an attacker-controlled one, either fetched over HTTP or from local disk, thus bypassing Secure Boot and enabling arbitrary code execution at the kernel level. The repository contains several key files: - `mkdiskimage`: A Bash script that automates the process of downloading the official IGEL UDC3 image, extracting and patching the system image, and assembling a bootable disk image with a custom root filesystem or kernel. - `root/sbin/init`: A shell script used as the init process, which parses kernel command-line arguments, fetches or mounts the specified kernel and initrd (supporting both HTTP and local sources), and uses kexec to boot into the attacker-supplied kernel. - `esp/boot/grub/igel.conf`: A GRUB configuration file that defines menu entries for both network and local kexec booting, specifying parameters for kernel, initrd, and command-line arguments. The exploit is primarily local (requires physical or privileged access to the device to modify the boot process), but it also supports network-based payload delivery (fetching kernel/initrd over HTTP). The PoC demonstrates how an attacker can persistently compromise a device by replacing its kernel, effectively rendering Secure Boot protections ineffective on affected IGEL OS systems. The README provides extensive documentation, impact analysis, and references to related resources.
Affected products & vendors
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Recent activity
38 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A zero-day vulnerability in Microsoft products that was actively exploited before being patched in October 2025.
Secure Boot bypass in IGEL OS prior to version 11 caused by improper cryptographic signature verification in the igel-flash-driver module, allowing booting/mounting of unverified crafted images.
A Secure Boot bypass vulnerability in IGEL OS before version 11, allowing attackers with physical access to deploy kernel-level rootkits and compromise virtual desktops.
A Secure Boot bypass zero-day in IGEL OS, reported as actively exploited.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.