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copy-fail-check — Interactive bash helper to check exposure to CVE-2026-31431 (Copy Fail) and apply temporary mitigation by disabling algif_aead module on Debian/Ubuntu and RHEL-based systems. | Kitploit
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GitHubjbnetwork-git/copy-fail-check

copy-fail-check

Interactive bash helper to check exposure to CVE-2026-31431 (Copy Fail) and apply temporary mitigation by disabling algif_aead module on Debian/Ubuntu and RHEL-based systems.

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3173 months agoReviewed by Kitploit

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copy-fail-check

CVE-2026-31431 Helper based on https://copy.fail/

Copy Fail Quick Check

Interactive bash helper to review basic exposure related to CVE-2026-31431 (Copy Fail) and apply a temporary mitigation based on algif_aead.

Target compatibility

Mainly intended for:

  • Debian / Ubuntu
  • AlmaLinux / Rocky / RHEL or RedHat-based systems.

What does it do?

  • Shows operating system, family, and kernel
  • Checks if algif_aead is available
  • Checks if algif_aead is loaded
  • Checks if the mitigation file already exists
  • Suggests patching flow based on family ( or )
apt
dnf
  • Allows applying temporary mitigation
  • Allows reverting temporary mitigation

    • What does it NOT do?

    • Does not 100% confirm if the system is already patched based on version alone
    • Does not replace kernel patching
    • Does not modify firewall, SSH, or other services unrelated to this mitigation

    Files

    • Main script:
      • copyfail-tool.sh
    • README:
      • readme.rd

    Usage

    Grant permissions and run:

    root@kitploit:~
    chmod +x copyfail-tool.sh
./copyfail-tool.sh

    To apply or revert mitigation, run it with sudo:

    root@kitploit:~
    sudo ./copyfail-tool.sh

    Menu options

    1. Check status
    2. Apply temporary mitigation
    3. Remove temporary mitigation
    4. About
    5. Exit

    Temporary mitigation it applies

    Creates this file:

    root@kitploit:~
    /etc/modprobe.d/disable-algif.conf

    With this line:

    root@kitploit:~
    install algif_aead /bin/false

    And then attempts:

    root@kitploit:~
    rmmod algif_aead

    Screenshots.

    Before applying the mitigation:
    Logo

    After applying the mitigation:
    Logo

    Important recommendation

    This tool is for quick review and temporary containment. The main recommendation remains:

    • patch the kernel as soon as possible
    • for untrusted workloads, also consider blocking AF_ALG via seccomp

    Note

    Many distributions apply security backports, so the kernel version alone does not always confirm whether you are already protected.

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