mrmtwoj/ubuntu-cve-2026-31431-mitigationInstruções de mitigação de risco e atualização para CVE-2026-31431 em sistemas Ubuntu, incluindo etapas de atualização do kernel e kmod.
Esta vulnerabilidade, também conhecida como Copy Fail, é um bug lógico no kernel Linux que ocorre no caminho AF_ALG / algif_aead. De acordo com o divulgador, um usuário local não autorizado pode fazer com que o kernel Linux realize uma escrita controlada de 4 bytes dentro do page cache de um arquivo legível. O resultado é que a versão em memória do arquivo é corrompida, enquanto o arquivo no disco permanece intacto. Este guia foi preparado para administradores de sistemas e a comunidade técnica do Irã e inclui:
Edite o seguinte arquivo:
/etc/apt/sources.list
Em seguida, de acordo com a versão do seu Ubuntu, substitua por uma das seções abaixo.
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu jammy main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu jammy-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu jammy-security main restricted universe multiverse
deb https://mirror.arvancloud.ir/ubuntu jammy main restricted universe multiverse
deb https://mirror.arvancloud.ir/ubuntu jammy-updates main restricted universe multiverse
deb https://mirror.arvancloud.ir/ubuntu jammy-security main restricted universe multiverse
deb https://mirror.iranserver.com/ubuntu jammy main restricted universe multiverse
deb https://mirror.iranserver.com/ubuntu jammy-updates main restricted universe multiverse
deb https://mirror.iranserver.com/ubuntu jammy-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-security main restricted universe multiverse
deb https://mirror.arvancloud.ir/ubuntu focal main restricted universe multiverse
deb https://mirror.arvancloud.ir/ubuntu focal-updates main restricted universe multiverse
deb https://mirror.arvancloud.ir/ubuntu focal-security main restricted universe multiverse
deb https://mirror.iranserver.com/ubuntu focal main restricted universe multiverse
deb https://mirror.iranserver.com/ubuntu focal-updates main restricted universe multiverse
deb https://mirror.iranserver.com/ubuntu focal-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu noble main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu noble-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu noble-security main restricted universe multiverse
deb https://mirror.arvancloud.ir/ubuntu noble main restricted universe multiverse
deb https://mirror.arvancloud.ir/ubuntu noble-updates main restricted universe multiverse
deb https://mirror.arvancloud.ir/ubuntu noble-security main restricted universe multiverse
deb https://mirror.iranserver.com/ubuntu noble main restricted universe multiverse
deb https://mirror.iranserver.com/ubuntu noble-updates main restricted universe multiverse
deb https://mirror.iranserver.com/ubuntu noble-security main restricted universe multiverse
sudo apt update
sudo apt install --only-upgrade kmod linux-generic
dpkg -l | egrep 'kmod|linux-generic|linux-image-generic|linux-headers-generic'
sudo reboot
uname -r
sudo apt update
sudo apt install --only-upgrade kmod
sudo apt update && sudo apt install --only-upgrade kmod linux-generic -y && sudo reboot
Notas importantes:
Preparado por A Cyber - acyber.ir