Hosein Yavarzadeh

I’m a 5th-year PhD candidate in the CSE department at the University of California San Diego.

My research lies at the intersection of computer security, CPU architecture, and system software. I specialize in analyzing the security of emerging confidential computing architectures, exploring exactly how hardware vulnerabilities can be exploited to compromise the software stack. By understanding the intricacies of advanced microarchitectural attacks, my goal is to develop practical, high-performance architectural defenses that secure the critical boundaries between the hardware, firmware, and the kernel.

I am advised by Professor Dean Tullsen and Professor Deian Stefan. I actively collaborate with Daniel Moghimi (Google), alongside researchers from various top-tier universities and industry laboratories.

news

Jul 28, 2026	I’m teaching CSE 141 (Intro to Computer Architecture) at UCSD in Summer Session 2 as the instructor.
Apr 02, 2026	Our paper TDXRay has been accepted to IEEE S&P 2026.
Sep 20, 2025	I’m back at Google for the next six months as a Student Researcher, working on confidential computing security and privacy.
Jun 05, 2025	I’m joining Qualcomm’s CPU Security team as a Research Intern for the next three months, working on security for next-generation Qualcomm CPUs.
Nov 19, 2024	I’m joining Google as a Student Researcher (November–April), working with Daniel Moghimi on confidential computing security and privacy.

publications

IEEE S&P

TDXRay: Microarchitectural Side-Channel Analysis of Intel TDX for Real-World Workloads

Hosein Yavarzadeh^*, Tristan Hornetz^*, Albert Cheu, Adria Gascon, Lukas Gerlach, Daniel Moghimi, Phillipp Schoppmann, Michael Schwarz, and Ruiyi Zhang

In 2026 IEEE Symposium on Security and Privacy (S&P), May 2026

Bib PDF Blog Code

@inproceedings{tdxray_sp26,
  title = {{TDXRay}: Microarchitectural Side-Channel Analysis of Intel {TDX} for Real-World Workloads},
  author = {Yavarzadeh, Hosein and Hornetz, Tristan and Cheu, Albert and Gascon, Adria and Gerlach, Lukas and Moghimi, Daniel and Schoppmann, Phillipp and Schwarz, Michael and Zhang, Ruiyi},
  booktitle = {2026 IEEE Symposium on Security and Privacy (S\&P)},
  year = {2026},
  month = may,
  publisher = {IEEE},
}

USENIX Sec

Indirector: High-Precision Branch Target Injection Attacks Exploiting the Indirect Branch Predictor

Hosein Yavarzadeh^*, Luyi Li^*, and Dean Tullsen

In 33rd USENIX Security Symposium (USENIX Security 24), Aug 2024

USENIX Security Distinguished Paper Bib PDF Video Blog Code

Distinguished Paper Award Winner

@inproceedings{li2024indirector,
  title = {Indirector: {High-Precision} Branch Target Injection Attacks Exploiting the Indirect Branch Predictor},
  author = {Yavarzadeh, Hosein and Li, Luyi and Tullsen, Dean},
  booktitle = {33rd USENIX Security Symposium (USENIX Security 24)},
  year = {2024},
  month = aug,
  address = {Philadelphia, PA},
  pages = {2137--2154},
  publisher = {USENIX Association},
}

ASPLOS

Pathfinder: High-Resolution Control-Flow Attacks Exploiting the Conditional Branch Predictor

Hosein Yavarzadeh, Archit Agarwal, Max Christman, Christina Garman, Daniel Genkin, Andrew Kwong, Daniel Moghimi, Deian Stefan, Kazem Taram, and Dean Tullsen

In International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS), Apr 2024

Bib PDF Video Blog Code

@inproceedings{yavarzadeh2024pathfinder,
  title = {Pathfinder: High-Resolution Control-Flow Attacks Exploiting the Conditional Branch Predictor},
  author = {Yavarzadeh, Hosein and Agarwal, Archit and Christman, Max and Garman, Christina and Genkin, Daniel and Kwong, Andrew and Moghimi, Daniel and Stefan, Deian and Taram, Kazem and Tullsen, Dean},
  booktitle = {International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS)},
  year = {2024},
  month = apr,
}

IEEE S&P

Half&Half: Demystifying Intel’s Directional Branch Predictors for Fast, Secure Partitioned Execution

Hosein Yavarzadeh, Mohammadkazem Taram, Shravan Narayan, Deian Stefan, and Dean Tullsen

In 2023 IEEE Symposium on Security and Privacy (S&P), May 2023

Bib PDF Video Blog Code

@inproceedings{yavarzadeh2023halfnhalf,
  title = {Half\&Half: Demystifying Intel's Directional Branch Predictors for Fast, Secure Partitioned Execution},
  author = {Yavarzadeh, Hosein and Taram, Mohammadkazem and Narayan, Shravan and Stefan, Deian and Tullsen, Dean},
  booktitle = {2023 IEEE Symposium on Security and Privacy (S\&P)},
  year = {2023},
  month = may,
  pages = {1220--1237},
  publisher = {IEEE},
}