Welcome

Welcome to my personal website. I’m Ernesto Martínez García, a 26 years old computer enthusiast from Spain, currently living in Austria. My dedication is Computer Security in its low level aspect, although I also enjoy managing headless Linux systems, hardening, programming and automation.

Currently doing a PhD in Information Security at the Institute of Information Security (ISEC, former IAIK) in the Secure Systems group and under the supervision of Stefan Mangard and Lukas Maar. I am also a member of the Capture The Flag team LosFuzzys, where I currently take the role of team captain. I also play with the merger team KuK Hofhackerei.

Here you’ll find my novice technical writings about security, software and linux systems. You can also visit my Bookmarks to see if you find something interesting through a chaotic collection of links I’ve been arranging for years.

Also please don’t hesitate to contact me if you want to, I’d be more than happy to respond. You can do so via old fashioned plaintext emails to my email address. Usually I check for new email often, although my response would depend on the workload.

Education

PhD Student in Information Security

Graz University of Technology
Ongoing

Masters in Computer Science

Graz University of Technology
2022–2025 · 120 ECTS
Graduated with Distinction

Bachelor in Computer Engineering

University of Alicante
2018–2022 · 240 ECTS
Graduated with Distinction · High Academic Performance Programme

Publications

LeakyTree: Cross-VM Bit-by-Bit Deduplicated Page Leakage via Linux Kernel Samepage Merging Internals

Ernesto Martínez García, Lukas Maar, Martin Unterguggenberger, Mathias Oberhuber, Stefan Mangard
Upcoming · ACM Conference on Computer and Communications Security (CCS) 2026

Presentations

Security Implications of Kernel Electric Fence

Linux Security Summit Europe · Linux Foundation
Upcoming · Prague, Czechia · 8 October 2026

Introduction to Linux Kernel Exploitation

Graz University of Technology · Summer Semester 2026

Secure Boot Overview

Graz University of Technology · 23 June 2023

Pseudo Random Number Generator Presentation

Graz University of Technology · 22 June 2023

Teaching

Secure Software Development

Lecturer
Graz University of Technology · 2025–present

Writings

GlacierCTF2024 - ksmaze

ksmaze is a linux kernel related challenge I authored in GlacierCTF2024. It had 1 solve 2h before the end of the 24h CTF. It categorizes in the hard side of the challenges.

Others

CVE-2026-43754

An app may be able to leak sensitive kernel state.
Apple · macOS