gagaltotal/cve-2026-31431-copy-fail

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Analysisdeepseek-v4-pro:cloud ·

Technical assessment

The artifact is a Python-based network scanner and patch helper for CVE-2026-31431. It connects to Linux hosts via SSH, checks kernel versions and module status to determine vulnerability, and can optionally apply mitigations or kernel upgrades. It does not contain code to exploit the vulnerability.

Backdoor review

No backdoor observed in reviewed code

The supplied evidence consists of a README.md, a Python scanner script (copyfail_scanner.py), and a requirements.txt. The scanner is a legitimate defensive tool that uses SSH to check Linux kernel versions and optionally apply patches or mitigations for CVE-2026-31431. No backdoor, trojan, or deceptive payload was observed. The script performs only the documented vulnerability scanning and remediation actions; it does not exfiltrate data, establish persistence, or execute unrelated commands.

ClassificationScanner
Model confidence98%
AuthenticationRequired
LanguagesPython
Target softwareLinux kernelalgif_aead module
Attack typesvulnerability scanningpatch management
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The code's primary operation is to detect vulnerable hosts by checking kernel versions and module status, and to optionally apply patches or mitigations. It does not contain any exploit payload, privilege escalation logic, or code that exercises the vulnerability. The README explicitly describes it as a 'scanner keamanan otomatis dan patch helper' (automatic security scanner and patch helper).

README.md:5copyfail_scanner.py:1-7

Requirements

  • Requires SSH access (key or password) to target Linux hosts.copyfail_scanner.py:922-925
  • Requires Python 3.7+ and paramiko, rich libraries.requirements.txt:1-2

Observed behavior

  • Scans a subnet or list of IPs by connecting via SSH, gathering kernel version, distro, and algif_aead module status.copyfail_scanner.py:568-603
  • Compares kernel version against a hardcoded map of patched versions per distro to determine if a host is vulnerable.copyfail_scanner.py:534-565
  • Optionally applies a temporary mitigation by disabling the algif_aead module via modprobe.d.copyfail_scanner.py:629-644
  • Optionally performs an automatic kernel upgrade using the detected package manager (apt, dnf, yum, zypper, pacman).copyfail_scanner.py:647-684
  • Generates a colorized table and summary of scan results, and can export results to JSON.copyfail_scanner.py:761-886
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Ssh Credential Handling
The script accepts SSH credentials (password or key) via command-line arguments and uses them to connect to target hosts.This is expected behavior for a legitimate SSH-based scanner. The credentials are used only for the declared purpose of scanning and patching; no evidence of credential exfiltration or misuse was found.copyfail_scanner.py:922-924
Remote Command Execution
The script executes commands on remote hosts via SSH, including kernel version checks, package manager detection, and kernel upgrade commands.All executed commands are directly related to the stated purpose of vulnerability detection and remediation. No unrelated or suspicious commands were identified.copyfail_scanner.py:571-578copyfail_scanner.py:130-151
Review boundaries

What the analysis did not establish

  • One non-text media file (screenshot) and one text file (likely LICENSE) were not included in the packet; their absence does not affect classification.
  • The evidence packet reports complete_artifact_coverage as false, but all three selected text files are provided in full.
  • Two files in the repository (one non-text media file and one unclassified file) were not included in the selected text evidence and were not analyzed. Their content is unknown.
  • The review is limited to static analysis of the provided source code; runtime behavior was not observed.
Model interpretation

This review is limited to the supplied PoC code and context. It does not assert that the code works or is safe to execute.

Linked vulnerabilities

1