{"id":80232,"date":"2026-05-08T14:09:08","date_gmt":"2026-05-08T07:09:08","guid":{"rendered":"https:\/\/itsystems.vn\/?p=80232"},"modified":"2026-07-29T11:20:39","modified_gmt":"2026-07-29T04:20:39","slug":"cve-2026-31431-linux-kernel-copy-fail-mitigation","status":"publish","type":"post","link":"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/","title":{"rendered":"CVE-2026-31431 Vulnerability in Linux Kernel: Copy Fail Risk and Mitigation"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">The content of the article<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#Introduction_to_CVE-2026-31431_Vulnerability\" >Introduction to CVE-2026-31431 Vulnerability<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#Scope_of_Impact_of_Copy_Fail_Linux_Kernel\" >Scope of Impact of Copy Fail Linux Kernel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#Mitigation_Measures_for_CVE-2026-31431_Vulnerability\" >Mitigation Measures for CVE-2026-31431 Vulnerability<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#Detailed_Mitigation_Steps\" >Detailed Mitigation Steps<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#References_and_Additional_Recommendations\" >References and Additional Recommendations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#Related_services_from_IT_Systems\" >Related services from IT Systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#FAQ\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#When_should_a_business_ask_IT_Systems_for_support\" >When should a business ask IT Systems for support?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#Can_IT_Systems_help_review_the_current_environment_before_proposing_a_solution\" >Can IT Systems help review the current environment before proposing a solution?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#Does_this_topic_connect_to_ongoing_IT_operations\" >Does this topic connect to ongoing IT operations?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/itsystems.vn\/en\/cve-2026-31431-linux-kernel-copy-fail-mitigation\/#Need_help_applying_this_to_your_business\" >Need help applying this to your business?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Introduction_to_CVE-2026-31431_Vulnerability\"><\/span>Introduction to CVE-2026-31431 Vulnerability<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The CVE-2026-31431 vulnerability, known as Copy Fail, is a serious security issue in the Linux kernel. This vulnerability allows local users to escalate privileges to root level, the highest administrator privileges of the system. According to CVSS v3.1 scoring, it has a score of AV:L\/PR:L, meaning it can only be exploited from within the system with low user privileges, not remotely over the network. However, the risk remains very high in shared environments like Docker containers or virtual machines where multiple users access the system.<\/p>\n<p>A PoC (Proof of Concept) has been publicly released, making it easy for hackers to test and exploit. For example, in a real-world scenario, an IT employee with regular user rights could use this vulnerability to access sensitive data or install malware. This is particularly dangerous for businesses using Linux as a server platform, where Copy Fail in the Linux kernel could lead to complete system takeover.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Scope_of_Impact_of_Copy_Fail_Linux_Kernel\"><\/span>Scope of Impact of Copy Fail Linux Kernel<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The CVE-2026-31431 vulnerability affects most Linux kernel versions from 4.14 and above. To check precisely, refer to the specific commit in the CVE Record. Popular distributions such as Red Hat Enterprise Linux, Debian, Ubuntu, Amazon Linux, and SUSE are impacted, depending on the kernel version in use.<\/p>\n<p>For example, on Ubuntu 20.04 with kernel 5.4, this vulnerability exists if the patch has not been applied. In cloud environments like AWS EC2 running Amazon Linux, Linux privilege escalation can occur if the instance uses an old kernel. Distro developers have issued separate announcements, recommending users check with the <strong>uname -r<\/strong> command to identify the kernel version. If the result shows a version from 4.14+, prioritize updating immediately.<\/p>\n<ul>\n<li>Red Hat: Check advisory RHSA-2026:XXXX<\/li>\n<li>Debian: Follow DSA-XXXX<\/li>\n<li>Ubuntu: USN-XXXX-X<\/li>\n<li>Amazon Linux: ALAS-2026-XXX<\/li>\n<li>SUSE: SUSE Security Advisory<\/li>\n<\/ul>\n<p>In practice, many Vietnamese companies using CentOS or Ubuntu servers for web hosting have encountered similar kernel vulnerabilities in the past, leading to downtime or data breaches. Therefore, monitoring updates from vendors is crucial.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Mitigation_Measures_for_CVE-2026-31431_Vulnerability\"><\/span>Mitigation Measures for CVE-2026-31431 Vulnerability<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The top priority is to apply official patches from the distro provider. Most major distributions have released emergency patches. For example, on Ubuntu, run <strong>sudo apt update &amp;&amp; sudo apt upgrade linux-generic<\/strong> to update the kernel. Similarly, Red Hat uses <strong>yum update kernel<\/strong> or <strong>dnf update kernel<\/strong>.<\/p>\n<p>If the patch is not yet available, apply temporary workarounds provided by some distros, such as disabling certain copy features in the kernel. However, test thoroughly in a staging environment to avoid service disruptions. A real-world example: In a DevOps project, the team applied a script to automatically reboot after kernel updates to ensure safety.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Detailed_Mitigation_Steps\"><\/span>Detailed Mitigation Steps<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><strong>Step 1:<\/strong> Check kernel version with <strong>uname -r<\/strong>.<\/li>\n<li><strong>Step 2:<\/strong> Update package manager: apt\/yum\/dnf\/zypper update.<\/li>\n<li><strong>Step 3:<\/strong> Reboot the system: <strong>sudo reboot<\/strong>.<\/li>\n<li><strong>Step 4:<\/strong> Verify with <strong>uname -r<\/strong> after reboot.<\/li>\n<\/ul>\n<p>For containers, update base images like the latest ubuntu:22.04. In Kubernetes, use DaemonSet for rolling node updates. Additional recommendation: Use SELinux or AppArmor to limit Linux privilege escalation even if vulnerabilities exist.<\/p>\n<p>For long-term prevention, implement CIS Benchmarks for Linux, perform periodic vulnerability scans with tools like OpenVAS or Trivy. Large enterprises often integrate CI\/CD pipelines with security scanning to detect Copy Fail Linux kernel issues early.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"References_and_Additional_Recommendations\"><\/span>References and Additional Recommendations<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For more details, refer to the official CVE Record and announcements from distros. According to the <a href=\"https:\/\/www.ipa.go.jp\/security\/security-alert\/2026\/alert20260501.html\" target=\"_blank\" rel=\"noopener\">report from IPA Security Center<\/a>, this page will be continuously updated with new information. For support, contact your product vendor instead of IPA, as they do not provide personal system advice.<\/p>\n<p>In summary, the CVE-2026-31431 vulnerability underscores the need for regular kernel maintenance. By acting quickly, you can mitigate Linux privilege escalation risks and effectively protect your systems.<br \/>\n<!-- its-deep-aio-en-related-2026-07-27 --><\/p>\n<section class=\"its-deep-aio-related\" aria-label=\"Related IT Systems services\">\n<h2><span class=\"ez-toc-section\" id=\"Related_services_from_IT_Systems\"><\/span>Related services from IT Systems<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If your team is dealing with this issue in a live business environment, these services can help you move from diagnosis to a stable operating process.<\/p>\n<ul>\n<li><a href=\"https:\/\/itsystems.vn\/en\/microsoft-business-licensing\/microsoft-windows-licensing\/\">Windows licensing for business<\/a><\/li>\n<li><a href=\"https:\/\/itsystems.vn\/en\/microsoft-business-licensing\/windows-license-pricing\/\">Windows license pricing<\/a><\/li>\n<li><a href=\"https:\/\/itsystems.vn\/en\/it-services-for-businesses\/it-support-services\/\">IT support services<\/a><\/li>\n<\/ul>\n<\/section>\n<p><!-- its-deep-aio-en-faq-2026-07-27 --><\/p>\n<section class=\"its-deep-aio-faq\" aria-label=\"Frequently asked questions\">\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"When_should_a_business_ask_IT_Systems_for_support\"><\/span>When should a business ask IT Systems for support?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ask for support when the issue affects users, business data, security, licensing compliance, service availability or daily operations. A short technical review often prevents repeated incidents and hidden costs.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_IT_Systems_help_review_the_current_environment_before_proposing_a_solution\"><\/span>Can IT Systems help review the current environment before proposing a solution?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. IT Systems can review the current setup, identify risks, map the issue to the right service scope and recommend a practical next step for your business.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_this_topic_connect_to_ongoing_IT_operations\"><\/span>Does this topic connect to ongoing IT operations?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In most cases, yes. Problems around software, cloud, endpoint, network, backup or security should be connected to a broader IT operations plan instead of being handled as isolated incidents.<\/p>\n<\/section>\n<p><!-- its-deep-aio-en-cta-2026-07-27 --><\/p>\n<section class=\"its-deep-aio-cta\" aria-label=\"Contact IT Systems\">\n<h2><span class=\"ez-toc-section\" id=\"Need_help_applying_this_to_your_business\"><\/span>Need help applying this to your business?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>IT Systems Vietnam can help assess the issue, recommend the right service path and support implementation for your team.<\/p>\n<p><a class=\"button\" href=\"https:\/\/itsystems.vn\/en\/contact-it-systems-vietnam\/\">Contact IT Systems<\/a> <a class=\"button\" href=\"https:\/\/itsystems.vn\/en\/it-services-for-businesses\/it-support-services\/\">View IT support services<\/a><\/p>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Introduction to CVE-2026-31431 Vulnerability The CVE-2026-31431 vulnerability, known as Copy Fail, is a serious security issue in the Linux kernel. This vulnerability allows local users to escalate privileges to root level, the highest administrator privileges of the system. According to CVSS v3.1 scoring, it has a score of AV:L\/PR:L, meaning it can only be exploited [&hellip;]<\/p>\n","protected":false},"author":54,"featured_media":80230,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"rank_math_focus_keyword":"CVE-2026-31431 vulnerability,Copy Fail Linux kernel, Linux privilege escalation","rank_math_title":"","rank_math_description":"Learn about the CVE-2026-31431 (Copy Fail) vulnerability in Linux kernel: scope of impact, privilege escalation risks, and detailed mitigation guide from patches to workarounds. 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