Linux admins -

Secure Boot was designed to protect systems against both physical and remote exploitation. When it was introduced in 2012, many Linux distributions struggled to comply with the requirement for signed bootloaders. These issues and others related to UEFI support are mostly because the bootloaders for Linux distros were not signed with keys recognized by Secure Boot-enabled systems. Microsoft's certificates were the default in most UEFI firmware, creating obstacles for Linux unless they utilized Microsoft's signing infrastructure.

Red Hat and others developed a workaround, and over time, the collaboration between Microsoft and the open-source community has improved, but this centralized certificate trust that still exists is still a significant structural weakness when those trust chains are exploited.

And that's just what happened.

Two vulnerabilities were discovered that can disable Secure Boot completely, turning the system’s last line of defense against rogue software into an open door for attackers. Admins must treat these vulnerabilities as systemic issues rather than isolated threats and protect systems against both physical and remote exploitation. Read on to learn more about how you can regain trust in your systems.

You'll also learn about two critical flaws - CVE-2025-5054 and CVE-2025-4598 - that were recently discovered in Apport and systemd-coredump that allow attackers to easily access secret info stored in coredumps.

If you found value in today’s newsletter, please share it with your friends! Do you have a Linux security-related topic you'd like to cover for our audience? We welcome contributions from passionate and insightful community members who share our love for Linux and security.

Yours in Open Source, 

Dv Signature Newsletter 2024 Esm W150

Dave Wreski

LinuxSecurity Founder

Secure Boot

The Discovery 

Two significant security bugs - CVE-2025-3052 and CVE-2025-47827- were recently discovered in Secure Boot, the security boundary that keeps rogue software and untrusted code at bay during system startup.

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The Impact

These flaws could enable attackers to disable Secure Boot or bypass Secure Boot protections entirely.

 The Fix

Patches have been released to mitigate these risks. It is crucial that all impacted admins update immediately to ensure Secure Boot remains enabled and robust.

Your Related Advisories:

[distro_list_1]

Apport / systemd-coredump

The Discovery 

Two critical flaws - CVE-2025-5054 and CVE-2025-4598 - have been discovered in Apport and systemd-coredump. 

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The Impact

These vulnerabilities allow attackers to easily access secret info stored in coredumps.

 The Fix

Patches have been released to mitigate the risks posed by these bugs. Those impacted by these flaws should update immediately to protect their sensitive information and prevent exploits.

Your Related Advisories:

[distro_list_2]