{"id":1570861,"date":"2026-05-05T16:23:44","date_gmt":"2026-05-05T16:23:44","guid":{"rendered":"http:\/\/BY79qQzhwpsbumfRgKd3D4"},"modified":"2026-05-05T16:23:44","modified_gmt":"2026-05-05T16:23:44","slug":"a-single-732-byte-python-script-can-be-used-to-obtain-root-on-essentially-all-linux-distributions-shipped-since-2017-time-to-update-your-kernel","status":"publish","type":"post","link":"https:\/\/arcader.org\/news\/a-single-732-byte-python-script-can-be-used-to-obtain-root-on-essentially-all-linux-distributions-shipped-since-2017-time-to-update-your-kernel\/","title":{"rendered":"&#8216;A single 732-byte Python script can be used to obtain root on essentially all Linux distributions shipped since 2017&#8217;: Time to update your kernel"},"content":{"rendered":"<article>\n<p>Gaming on Linux has never been better\u2014but that doesn&#8217;t mean your distros are free from security threats. Case in point is a severe vulnerability nicknamed &#8216;Copy Fail,&#8217; which allows a local user to dig into the guts of the OS and give themselves root privileges merely by writing four bytes of controlled data into the page cache of any readable file.<\/p>\n<p>The security research team at <a href=\"https:\/\/xint.io\/blog\/copy-fail-linux-distributions\" target=\"_blank\">Theori disclosed the vulnerability last Wednesday<\/a>, though CISA reports that threat actors have since been observed using the exploit in the wild. The security flaw has been given the designation <a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-31431\" target=\"_blank\">CVE-2026-31431<\/a> and marked with a high severity score of 7.8 (via <a href=\"https:\/\/www.bleepingcomputer.com\/news\/security\/cisa-says-copy-fail-flaw-now-exploited-to-root-linux-systems\/\" target=\"_blank\">Bleeping Computer<\/a>).<\/p>\n<p>This is because Copy Fail could potentially leave a large number of Linux users exposed\u2014if you&#8217;ve not updated your kernel in a hot minute, now would be the time. Theori puts it succinctly in its write-up, summarising, &#8220;A single 732-byte Python script can [be used to] obtain root on essentially all Linux distributions shipped since 2017.&#8221;<\/p>\n<div style=\"min-height: 250px;\">\n<div class=\"kwizly-quiz kwizly-Xp4ZAX\"><\/div>\n<\/p><\/div>\n<p> <script src=\"https:\/\/kwizly.com\/embed\/Xp4ZAX.js\" async><\/script><\/p>\n<p>As such, CISA <a href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog?search=CVE-2026-31431&#038;field_date_added_wrapper=all&#038;field_cve=&#038;sort_by=field_date_added&#038;items_per_page=20&#038;url=\" target=\"_blank\">added the vulnerability to its Known Exploited Vulnerabilities Catalog<\/a>. In accordance with &#8216;<a href=\"https:\/\/www.cisa.gov\/news-events\/directives\/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities\" target=\"_blank\">Binding Operational Directive (BOD) 22-01<\/a>&#8216;, this move in turn requires <a href=\"https:\/\/www.cisa.gov\/news-events\/directives\/federal-civilian-executive-branch-agencies-list\" target=\"_blank\">Federal Civilian Executive Branch agencies<\/a> based throughout the USA to update their systems by May 15 in order to protect their systems against this active threat.<\/p>\n<p>CISA warns, &#8220;This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise.&#8221;<\/p>\n<figure class=\"van-image-figure inline-layout\" data-bordeaux-image-check >\n<div class='image-full-width-wrapper'>\n<div class='image-widthsetter' style=\"max-width:1920px;\">\n<p class=\"vanilla-image-block\" style=\"padding-top:56.25%;\"><img loading=\"lazy\" decoding=\"async\" id=\"moJu4CGvCX5NeT5qQNPPeX\" name=\"ubuntu-login\" alt=\"Ubuntu's user screen in the settings.\" src=\"https:\/\/arcader.org\/wp-content\/uploads\/2026\/05\/a-single-732-byte-python-script-can-be-used-to-obtain-root-on-essentially-all-linux-distributions-shipped-since-2017-time-to-update-your-kernel.png\" mos=\"\" align=\"middle\" fullscreen=\"\" width=\"1920\" height=\"1080\" attribution=\"\" endorsement=\"\" class=\"inline\"><\/p>\n<\/div>\n<\/div><figcaption itemprop=\"caption description\" class=\" inline-layout\"><span class=\"credit\" itemprop=\"copyrightHolder\">(Image credit: Ubuntu)<\/span><\/figcaption><\/figure>\n<p>Cybersecurity firm Theori also offers <a href=\"https:\/\/copy.fail\/\" target=\"_blank\">a more digestible Copy Fail guide<\/a>. This includes the security research team&#8217;s original Proof of Concept script so &#8220;defenders can verify their own systems and validate vendor patches.&#8221; It&#8217;s worth clarifying that this script requires local access to a machine running Linux, and that the security vulnerability is <em>not <\/em>an example of remote code execution.<\/p>\n<p>The team found the same script works in Ubuntu 24.04 LTS, Amazon Linux 2023, RHEL 10.1, and SUSE 16, but obviously, plenty of other Linux distros are also affected.<\/p>\n<p>This news follows claims made last week by Canonical\u2014the company that created Ubuntu\u2014that its web infrastructure was under a &#8220;<a href=\"https:\/\/www.pcgamer.com\/software\/security\/canonical-the-company-that-makes-ubuntu-linux-says-its-web-infrastructure-is-under-a-sustained-cross-border-attack\/\" target=\"_blank\">sustained, cross-border attack<\/a>&#8220;. Though the Copy Fail vulnerability was disclosed by Theori around the same time, the exploit may not be to blame. Canonical has yet to provide an update after <a href=\"https:\/\/x.com\/ubuntu\/status\/2050112955132297652\" target=\"_blank\">its X post on May 1st<\/a>.<\/p>\n<\/article>\n<p><a href=\"https:\/\/www.pcgamer.com\/software\/linux\/a-single-732-byte-python-script-can-be-used-to-obtain-root-on-essentially-all-linux-distributions-shipped-since-2017-time-to-update-your-kernel\/\">Source<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gaming on Linux has never been better\u2014but that doesn&#8217;t mean your distros are free from security threats. Case in point is a severe vulnerability nicknamed &#8216;Copy Fail,&#8217; which allows a local user to dig into the guts of the OS and give themselves root privileges merely by writing four bytes of controlled data into the page cache of any readable file. The security research team at Theori disclosed the vulnerability last Wednesday, though CISA reports that threat actors have since been observed using the exploit in the wild. The security flaw has been given the designation CVE-2026-31431 and marked with a high severity score of 7.8 (via Bleeping Computer). This is because Copy Fail could potentially leave a large number of Linux users exposed\u2014if you&#8217;ve&hellip;<\/p>\n<p class=\"excerpt-more\"><a class=\"blog-excerpt button\" href=\"https:\/\/arcader.org\/news\/a-single-732-byte-python-script-can-be-used-to-obtain-root-on-essentially-all-linux-distributions-shipped-since-2017-time-to-update-your-kernel\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":1,"featured_media":1570862,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[336],"tags":[836,6599,1622],"class_list":["post-1570861","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pc-gamer","tag-linux","tag-operating-systems","tag-software"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>&#039;A single 732-byte Python script can be used to obtain root on essentially all Linux distributions shipped since 2017&#039;: Time to update your kernel | Arcader News<\/title>\n<meta name=\"description\" content=\"Gaming on Linux has never been better\u2014but that doesn&#039;t mean your distros are free from security threats. 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