{"id":9339,"date":"2016-10-24T08:02:23","date_gmt":"2016-10-24T14:02:23","guid":{"rendered":"https:\/\/www.siteground.com\/blog\/?p=9339"},"modified":"2025-09-18T14:49:04","modified_gmt":"2025-09-18T14:49:04","slug":"dirty-cow-vulnerability","status":"publish","type":"post","link":"https:\/\/www.siteground.com\/blog\/dirty-cow-vulnerability\/","title":{"rendered":"Dirty COW Linux Kernel Vulnerability Fixed"},"content":{"rendered":"\n<p>Last week a very serious vulnerability in the Linux kernel, the so called Dirty COW, was&nbsp;reported. Our dedicated Linux kernel team immediately addressed the issues and were able to patch it&nbsp;in less than 24 hours on&nbsp;the majority of our servers. What is more, we managed to do this without server reboot and we avoided the downtime that normally results from such kernel update activities. To learn more about the vulnerability and how we addressed it read below.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"what-is-that-dirty-cow-about\"><\/span>What is that Dirty COW about?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The Dirty COW vulnerability allows attackers to gain root access to servers and take control over the whole system. The security hole was detected by researcher Phil Oester, who found out a race condition in the way the Linux kernel&#8217;s memory subsystem handles copy-on-write (COW) breakages of private read-only memory mappings. Attackers can use this to gain write access to otherwise read-only mappings and this way take control over whole systems. For more technical information you may check <a rel=\"noopener noreferrer\" href=\"https:\/\/access.redhat.com\/security\/cve\/CVE-2016-5195\" target=\"_blank\">the official vulnerability page<\/a> and <a href=\"https:\/\/dirtycow.ninja\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\" (opens in a new tab)\">this site<\/a> which is dedicated to the vulnerability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"how-widespread-is-the-issue\"><\/span>How widespread is the issue?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The issue most probably affects hundreds of thousands, if not millions, of Linux based machines. If you are not running the latest version of the Linux kernel you should be worried. In fact, even if you are running the latest kernel you should still be worried, as at the time this post is written not all vendors have patched their respective kernels yet. If you want to try and hack your own system you can visit <a href=\"https:\/\/github.com\/dirtycow\/dirtycow.github.io\/wiki\/PoCs\" target=\"_blank\" rel=\"noopener noreferrer\">this Github page<\/a> and use the PoCs provided on it. According to the reports, the following Linux distro versions are vulnerable (please note that this is not a complete list but rather a list of the most popular Linux distros):<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Red Hat Enterprise Linux 7.x<\/li><li>Red Hat Enterprise Linux 6.x<\/li><li>Red Hat Enterprise Linux 5.x<\/li><li>CentOS Linux 7.x<\/li><li>CentOS Linux 6.x<\/li><li>CentOS Linux 5.x<\/li><li>Debian Linux wheezy<\/li><li>Debian Linux jessie<\/li><li>Debian Linux stretch<\/li><li>Debian Linux sid<\/li><li>Ubuntu Linux precise (LTS 12.04)<\/li><li>Ubuntu Linux trusty<\/li><li>Ubuntu Linux xenial (LTS 16.04)<\/li><li>Ubuntu Linux yakkety<\/li><li>Ubuntu Linux vivid\/ubuntu-core<\/li><li>SUSE Linux Enterprise 11 and 12.<\/li><li>Openwrt<\/li><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"what-is-the-standard-issue-resolution\"><\/span>What is the standard issue resolution?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The easiest way to protect your computers running Linux is to update your Linux distro to the latest version. Keep in mind that this action, however, requires a reboot. You can use the following commands to update your Debian\/Ubuntu and RHEL systems:<\/p>\n\n\n\n<p><strong>Debian\/Ubuntu:<\/strong><br>$ sudo apt-get update &amp;&amp; sudo apt-get upgrade &amp;&amp; sudo apt-get dist-upgrade<\/p>\n\n\n\n<p><strong>RHEL:<\/strong><br>$ sudo yum update<br>$ sudo reboot<\/p>\n\n\n\n<p><strong>CentOS:<\/strong><br>There is still no official update of the CentOS kernel. At this time the only way to patch your CentOS servers is to follow the instructions from <a href=\"https:\/\/bugzilla.redhat.com\/show_bug.cgi?id=1384344#c13\" target=\"_blank\" rel=\"noopener noreferrer\">this link<\/a>.<\/p>\n\n\n\n<p>Once you reboot your Linux computers, ensure that they are running the new kernel by executing the following commands:<\/p>\n\n\n\n<p>$ uname -a<br>$ uname -r<br>$ uname -mrs<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"what-siteground-did-to-resolve-this-issue\"><\/span>What SiteGround did to resolve this issue?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>For quite some time we use our own custom kernel. This means that when issues like this appear we are not dependent on the updates released by the OS developers. Instead we can get creative immediately and we can craft our own solutions. In this particular case our devops team made use of several updates provided by the upstream kernel developers and the kernel security experts from <a href=\"https:\/\/grsecurity.net\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">GRSecurity<\/a> related with the issue. We adapted them in a timely manner and created a patch that worked for our specific kernel.<\/p>\n\n\n\n<p>As we mentioned, upgrading the kernel means that you will have to reboot your servers. Needless to say a hosting company such as SiteGround cannot simply restart thousands of servers and cause downtime to hundreds of thousands of sites.<\/p>\n\n\n\n<p>That is why we decided to patch the kernel without restarting our servers. We used a tool called <a href=\"https:\/\/github.com\/dynup\/kpatch\" target=\"_blank\" rel=\"noopener noreferrer\">kpatch<\/a>, which allowed us to patch the running kernels without rebooting or restarting any processes. The problem with using such tools is that there is always a chance that something may go wrong and a server may crash. We have different servers configured in different ways that run different kernels. That is why we had to test a big number of scenarios before we applied&nbsp;the patch live on so many servers. We knew about the problem before the Dirty COW website was created and we started working on a fix the moment the kernel developers released the patch. That is why we had enough time to perform the needed checks.<\/p>\n\n\n\n<p>All shared, cloud and dedicated SiteGround servers are already patched.<\/p>\n\n\n<p>[subscribe_cta]<\/p>\n","protected":false},"excerpt":{"rendered":"Last week a very serious vulnerability in the Linux kernel, the so called Dirty COW, was&nbsp;reported. Our dedicated Linux kernel team immediately addressed the issues and were able to patch it&nbsp;in less than 24 hours on&nbsp;the majority of our servers. What is more, we managed to do this without server reboot and we avoided the&hellip;","protected":false},"author":57,"featured_media":13199,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2098,12],"tags":[],"class_list":["post-9339","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hosting-insights","category-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.2 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Dirty COW Linux Kernel Vulnerability Fixed : SiteGround Blog<\/title>\n<meta name=\"description\" content=\"Last week a very serious vulnerability in the Linux kernel, the so called Dirty COW, was&nbsp;reported. Our dedicated Linux kernel team immediately\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dirty COW Linux Kernel Vulnerability Fixed\" \/>\n<meta property=\"og:description\" content=\"Last week a very serious vulnerability in the Linux kernel, the so called Dirty COW, was&nbsp;reported. Our dedicated Linux kernel team immediately\" \/>\n<meta property=\"og:url\" content=\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/\" \/>\n<meta property=\"og:site_name\" content=\"SiteGround\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/siteground\" \/>\n<meta property=\"article:published_time\" content=\"2016-10-24T14:02:23+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-18T14:49:04+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/newblog.siteground.com\/en\/wp-content\/uploads\/sites\/2\/2016\/10\/dirty-cow-blogpost.jpg\" \/>\n<meta name=\"author\" content=\"Daniel Kanchev\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@siteground\" \/>\n<meta name=\"twitter:site\" content=\"@siteground\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Daniel Kanchev\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/\"},\"author\":{\"name\":\"Daniel Kanchev\",\"@id\":\"https:\/\/newblog.siteground.com\/en\/#\/schema\/person\/380162a677d6c37329e9a12baa334572\"},\"headline\":\"Dirty COW Linux Kernel Vulnerability Fixed\",\"datePublished\":\"2016-10-24T14:02:23+00:00\",\"dateModified\":\"2025-09-18T14:49:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/\"},\"wordCount\":767,\"commentCount\":14,\"publisher\":{\"@id\":\"https:\/\/newblog.siteground.com\/en\/#organization\"},\"image\":{\"@id\":\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/newblog.siteground.com\/en\/wp-content\/uploads\/sites\/2\/2016\/10\/dirty-cow-vulnerability-fixed-1200x600-1.jpg\",\"articleSection\":[\"Hosting Insights\",\"Security\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/\",\"url\":\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/\",\"name\":\"Dirty COW Linux Kernel Vulnerability Fixed : SiteGround Blog\",\"isPartOf\":{\"@id\":\"https:\/\/newblog.siteground.com\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/newblog.siteground.com\/en\/dirty-cow-vulnerability\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/newblog.siteground.com\/en\/wp-content\/uploads\/sites\/2\/2016\/10\/dirty-cow-vulnerability-fixed-1200x600-1.jpg\",\"datePublished\":\"2016-10-24T14:02:23+00:00\",\"dateModified\":\"2025-09-18T14:49:04+00:00\",\"description\":\"Last week a very serious vulnerability in the Linux kernel, the so called Dirty COW, was&nbsp;reported. 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