Estudo-de-Caso-CVE-2026-31431-CopyFail

🐧 CVE-2026-31431 — CopyFail: Linux Kernel Privilege Escalation Complete Case Study — How it was discovered, how it works, how to test, how to replicate in a safe environment and how to fix the critical vulnerability that affects almost all Linux distributions since 2017. 🚨 Legal Notice / Disclaim...

CVE-2026-31431

CopyFail CVE-2026-31431 Overview CopyFail is a proof-of-concept exploit for CVE-2026-31431, targeting a memory corruption vulnerability in the Linux Kernel Crypto API AFALG. The exploit leverages the splice system call to perform unauthorized page-cache patching of the /usr/bin/su binary, enablin...

block-copyfail

Summary CVE-2026-31431 "Copy Fail" is a Linux kernel privilege escalation vulnerability in the algifaead cryptographic interface. An attacker uses AFALG sockets with the authencesn algorithm and splice to corrupt arbitrary files in the kernel page cache — including setuid binaries like /usr/bin/s...

CVE-2026-31431

CVE-2026-31431 Copy Fail — C PoC Trivial unprivileged LPE by writing 4 controlled bytes into the page cache of any readable file via a logic bug in AFALG kernel 4.14 → early 2026. Corrupt /usr/bin/su in-memory, then run it → root. Build & Run root@kitploit: 1. Generate an ELF payload reverse shel...

afalg-check

Itsumma AFALG Check Diagnostic utility for Linux that checks: availability of AFALG / algifaead and helps assess the risk of CVE-2026-31431 copy-fail; the presence of an attack surface for the Dirty Frag vulnerability class xfrm-ESP Page-Cache Write + RxRPC Page-Cache Write chain across the esp4,...

copy-fail-CVE-2026-31431-shell

CVE-2026-31431 - copyfail shell Local privilege escalation via AFALG socket + splice page-cache overwrite. Overwrites a read-only SUID binary /usr/bin/su with a minimal ELF that calls setuid0 + execve"/bin/sh". No race condition, no per-distro offsets, single shot. root@kitploit: $...

CVE-2026-31431-python-copyfail-POC

CVE-2026-31431: Copy Fail - Linux Kernel Privilege Escalation Copy Fail CVE-2026-31431 is a critical logic bug in the Linux kernel's cryptographic subsystem that allows unprivileged users to achieve privilege escalation to root. The vulnerability affects Linux kernels 6.0.0 through 6.18.x across...

CVE-2026-31431-Copy-Fail-Container-Escape

CVE-2026-31431-Copy-Fail-Container-Escape Demo https://github.com/user-attachments/assets/2cb0cb67-789a-4461-a0b8-1fe878d9426e Prerequisite Container vulnerable to CVE-2026-31431 Container healthcheck configured and healthcheck CMD known Obtained root access inside the container if not, you can...

ansible-role-cve-2026-31431

ansible-role-cve-2026-31431 Ansible role to apply and later remove the modprobe.d mitigation for CVE-2026-31431 "Copy Fail" in the Linux kernel's AFALG / algifaead subsystem. Tested on Debian. Pull requests for other distributions, edge cases, or improvements are very welcome. What it does The ro...

copy-fail-CVE-2026-31431-poc

CVE-2026-31431 — Copy Fail Proof of Concept This repository contains a Proof of Concept exploit for CVE-2026-31431 , a high-severity Linux kernel local privilege escalation vulnerability that allows any unprivileged local user to gain root access. The flaw, dubbed “Copy Fail”, resides in the...

CVE-2026-31431

CopyFail2 CVE-2026-31431 - Python Implementation Python port of the CopyFail2 kernel exploit leveraging xfrm ESP-in-UDP MSGSPLICEPAGES no-COW fast path for unprivileged Linux local privilege escalation. Replaces a nologin/false entry in /etc/passwd with a passwordless uid-0 user and drops into a...

poc-yaws-cgi-shell-injection

OS command injection in Yaws web server CVE-2020-24916 Proof of concept Build test image: docker build -t vulnbe/yaws-pocs:shell-injection-appmod-cgi -f Dockerfile . and/or Run container docker run --rm -d -i -p 127.0.0.1:8000:8080 vulnbe/yaws-pocs:shell-injection-appmod-cgi root@kitploit: curl...

CVE-2026-31431-Exploit

CVE-2026-31431 "Copy Fail" Exploit A professional proof-of-concept for the CVE-2026-31431 vulnerability, a critical flaw in the Linux kernel's algifaead / authencesn page-cache handling. Overview The CVE-2026-31431 vulnerability, colloquially known as "Copy Fail" , involves a page-cache...

Linux-CopyFail-C-Version-CVE-2026-31431

Linux CopyFail- C Version - CVE-2026-31431 Clean C version of Copy Fail CVE-2026-31431 - Linux Local Privilege Escalation exploit using AFALG + authencesn + splice primitive. Overwrites the page cache of /usr/bin/su with a tiny setuid shellcode to gain root privileges. Educational proof-of-concep...

cve-2026-31431-copyfail

CVE-2026-31431 — "Copy Fail" 🔐 Educational technical analysis of one of the most significant Linux kernel vulnerabilities since Dirty Pipe 2022. This repository is intended for research, study, and defense. No functional exploit is distributed here. Table of Contents What is it? For laypeople: th...

CVE-2026-31431-mitigacion

CVE-2026-31431 — Complete Technical Analysis Classification: Local Privilege Escalation LPE — Linux Kernel CVSS: 7.8 High Impact: unprivileged user → root Affected module: algifaead AFALG kernel subsystem Table of Contents 1. Why is it vulnerable? 2. Which versions are affected? 3. How it is...

copy-fail-python

copyfailsu.py Python port of badsectorlabs/copyfail-go CVE-2026-31431. Linux only; requires Python 3.10+ os.splice. How it gets root important This tool does not use the /etc/passwd page-cache trick. It overwrites the page cache of the setuidsu binary with embedded shellcode same payloads as the ...

CVE-2026-29000-pac4j-jwt

pac4j-jwe-forge CVE-2026-29000 Proof-of-concept for CVE-2026-29000. Targets pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3. The vulnerability is straightforward: the library accepts a PlainJWT unsigned, alg=none as long as it's wrapped inside a valid JWE. Since the server exposes its RSA...

CVE-2026-31431

CVE-2026-31431: "Copy Fail" - Linux Kernel Local Privilege Escalation 📢 Disclaimer This repository is strictly for educational and cybersecurity research purposes. The exploit code is analyzed to understand the underlying vulnerability, facilitate patching, and develop defensive strategies. Do no...

CopyFail-Exploits-CVE-2026-31431

CVE-2026-31431 — Copy Fail Educational repository with multi-language implementations of the Copy Fail exploit. Created and maintained by @shotafry — because reading the CVE is not enough. You have to reproduce it. 📖 Leer en Español Table of Contents What is Copy Fail? Who discovered it? Severity...