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V4bel
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![tux](assets/demo.gif) ![tux](assets/demo.gif)
This document describes the Dirty Frag vulnerability class, first discovered and reported by [Hyunwoo Kim (@v4bel)](https://x.com/v4bel), which can obtain root privileges on major Linux distributions by chaining the `xfrm-ESP Page-Cache Write` vulnerability and the `RxRPC Page-Cache Write` vulnerability. This document describes the Dirty Frag vulnerability class, first discovered and reported by [Hyunwoo Kim (@v4bel)](https://x.com/v4bel), which can obtain root privileges on major Linux distributions by chaining the `xfrm-ESP Page-Cache Write (CVE-2026-43284)` vulnerability and the `RxRPC Page-Cache Write (CVE-2026-43500)` vulnerability.
Dirty Frag is a case that extends the bug class to which [Dirty Pipe](https://dirtypipe.cm4all.com/) and [Copy Fail](https://copy.fail/) belong. Because it is a deterministic logic bug that does not depend on a timing window, no race condition is required, the kernel does not panic when the exploit fails, and the success rate is very high. Dirty Frag is a case that extends the bug class to which [Dirty Pipe](https://dirtypipe.cm4all.com/) and [Copy Fail](https://copy.fail/) belong. Because it is a deterministic logic bug that does not depend on a timing window, no race condition is required, the kernel does not panic when the exploit fails, and the success rate is very high.