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0xkato

A blog about technology and stuff related

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What Codex Actually Sends to the Model

I recorded the requests Codex generated for a 16-character prompt and measured what changed as it loaded instructions, exposed tools, read files, ran commands, received images, and compacted its history

How to Research Technical Topics With AI

How I go from a technical question I cannot answer to an explanation I can reconstruct without the model

How LLMs Actually Work

A from-the-ground-up walkthrough of how modern LLMs work, from tokens to transformer blocks to the next-token loop

The Next Jump

Why I'm shifting from vulnerability research to machine learning security

CVE-2026-1678: DNS Parser Overflow in Zephyr

A walkthrough of CVE-2026-1678, a critical out-of-bounds write in Zephyr's DNS name parser caused by a stale bounds check

How CPU Caches Work

How CPU caches work, explained with a simple office analogy.

Is RCE Really Just Low Severity?

A friendly case study of a command injection in fmt::say, how it was fixed, and how impact and exposure shape severity

The Life of a Packet in the Linux kernel

A practical, plain-English tour of how Linux moves packets from write() to the wire and back

A Friendly Tour of Process Memory on Linux

A deep dive into how Linux manages process memory, page tables, and virtual address spaces

The Linux Boot Process: From Power Button to Kernel

A detailed walkthrough of the Linux boot process from power button to kernel initialization