DeepSeek + Claude Code Reproduce CVE‑2026‑31431 Linux ‘Copy Fail’ Privilege Escalation

The author demonstrates how a human‑provided prompt combined with DeepSeek v4 Pro and Claude Code can autonomously audit the Linux 6.12 crypto subsystem, locate the CVE‑2026‑31431 “Copy Fail” privilege‑escalation bug, and validate the full exploit chain in four iterative dialogues costing less than three dollars.

AI auditingCVE-2026-31431Claude Code

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DeepSeek + Claude Code Reproduce CVE‑2026‑31431 Linux ‘Copy Fail’ Privilege Escalation

Ops Development Stories

Apr 30, 2026 · Information Security

Urgent May Day Alert: CVE‑2026‑31431 Linux Kernel LPE & Container Escape

A high‑severity Linux kernel flaw (CVE‑2026‑31431, dubbed "Copy Fail") allows ordinary users to gain root privileges and escape containers via an AF_ALG and splice() optimization bug, affecting major distributions; the article details the vulnerability, exploitation steps, PoC, and mitigation guidance.

AF_ALGCVE-2026-31431LPE

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Urgent May Day Alert: CVE‑2026‑31431 Linux Kernel LPE & Container Escape

Black & White Path

Apr 30, 2026 · Information Security

Linux Kernel’s ‘Copy Fail’ CVE‑2026‑31431: A 732‑Byte Python Script Grants Root in One Step

A newly disclosed Linux kernel vulnerability (CVE‑2026‑31431, dubbed “Copy Fail”) allows an unprivileged user to execute a 732‑byte Python script that writes four controllable bytes into the page cache, directly modifying /usr/bin/su to obtain root, affecting all kernels from 2017 to the patch release and posing severe risks such as container escape and cloud‑tenant isolation breaches.

CVE-2026-31431Linuxcontainer escape

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Linux Kernel’s ‘Copy Fail’ CVE‑2026‑31431: A 732‑Byte Python Script Grants Root in One Step