Cve 2026 31431 Copy Fail

Name: Cve 2026 31431 Copy Fail
Price: 5 USD
Availability: InStock
Author: Agensi

by Liam Romanis

Detect and assess CVE-2026-31431 "Copy Fail" vulnerability on Linux systems and Kubernetes clusters.

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See it in action

You say

Scan our staging Kubernetes worker nodes for 'Copy Fail' vulnerability and let me know if we need to blacklist any modules.

Your agent does

[!] CVE-2026-31431 "Copy Fail" DETECTED Verdict: VULNERABLE Kernel: 5.15.0-generic (unpatched) AF_ALG Access: Yes Module Status: algif_aead is loaded. Action: Blacklisting will NOT work as CONFIG_CRYPTO_AUTHENC=y (built-in). You must update the host kernel to patch.

What you get

Audit CI/CD runners to prevent kernel exploit execution during builds.Assess Kubernetes pod exposure to host-level crypto socket vulnerabilities.Verify if a kernel patch commit is present in a specific Linux build.Determine if algif_aead blacklisting is an effective interim mitigation.

About this skill

What it does

This skill provides a comprehensive, non-destructive diagnostic suite for detecting CVE-2026-31431 "Copy Fail". It audits Linux kernels (versions 4.10–6.14) for a critical page cache corruption vulnerability that allows unprivileged local privilege escalation via AF_ALG crypto sockets.

Why use this skill

Detecting "Copy Fail" manually is error-prone. Standard package scans often miss kernel config states or runtime mitigations. This skill performs a compound analysis of ten distinct vectors, including patch presence verification, algif_aead module status, and AF_ALG socket accessibility. It's better than manual prompting because it executes a standardized, multi-step investigative script that provides actionable intelligence and programmatic JSON output for SIEM or CI/CD integration.

Key Features

Compound Verdicts: Correlates kernel versions with build info and runtime socket access to reduce false positives.
Container & K8s Aware: Correctly identifies host kernel exposure when run inside a containerized environment.
CI/CD Integration: Supports a headless mode with specific exit codes to gate deployments on vulnerable infrastructure.
Remediation Guidance: Automatically provides context-specific mitigation steps based on whether the crypto module is built-in or loadable.

Supported Tools

The skill utilizes standard POSIX utilities, bash, and python3 (optional) to ensure compatibility across Ubuntu, Debian, RHEL, CentOS, Alpine, and generic Linux distributions.