{"id":237989,"date":"2026-05-01T14:58:00","date_gmt":"2026-05-01T18:58:00","guid":{"rendered":"https:\/\/news-you-need.com\/index.php\/2026\/05\/01\/linux-kernel-0-day-copy-fail-roots-every-major-distribution-since-2017\/"},"modified":"2026-05-01T15:40:12","modified_gmt":"2026-05-01T19:40:12","slug":"linux-kernel-0-day-copy-fail-roots-every-major-distribution-since-2017","status":"publish","type":"post","link":"https:\/\/news-you-need.com\/index.php\/2026\/05\/01\/linux-kernel-0-day-copy-fail-roots-every-major-distribution-since-2017\/","title":{"rendered":"Linux Kernel 0-Day &#8220;Copy Fail&#8221; Roots Every Major Distribution Since 2017"},"content":{"rendered":"<p><a href=\"https:\/\/cybersecuritynews.com\/linux-kernel-0-day-copy-fail\/\">Linux Kernel 0-Day &#8220;Copy Fail&#8221; Roots Every Major Distribution Since 2017<\/a><\/p>\n<p><a href=\"https:\/\/cybersecuritynews.com\/linux-kernel-0-day-copy-fail\/\">https:\/\/cybersecuritynews.com\/linux-kernel-0-day-copy-fail\/<\/a><\/p>\n<p>Publish Date: <a href=\"publish_date]\">2026-05-01 14:58:00<\/a><\/p>\n<p>Source Domain: <a href=\"cybersecuritynews.com\">cybersecuritynews.com<\/a><\/p>\n<p>A critical zero-day vulnerability in the Linux kernel has been publicly disclosed, enabling any unprivileged local user to obtain root access on virtually every major Linux distribution shipped since 2017.<\/p>\n<p>Dubbed \u201cCopy Fail\u201d and tracked as CVE-2026-31431, the flaw was discovered by Theori researcher Taeyang Lee and scaled into a full exploit chain by the Xint Code Research Team using AI-assisted analysis.<\/p>\n<p>Copy Fail is a straight-line logic bug not a race condition in the Linux kernel\u2019s authencesn cryptographic template, reachable via the AF_ALG socket interface combined with the splice() system call.<\/p>\n<p>Unlike predecessors such as Dirty Cow (CVE-2016-5195) or Dirty Pipe (CVE-2022-0847), this vulnerability requires no race-winning, no kernel version offsets, no recompilation, and no compiled payloads.<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-linux-kernel-0-day-copy-fail\"><strong>Linux Kernel 0-Day \u201cCopy Fail\u201d<\/strong><\/h2>\n<p>A single 732-byte Python script using only standard library modules achieves deterministic root on every tested distribution and architecture.<\/p>\n<p><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">The exploit targets the kernel\u2019s page cache<\/span>, the in-memory representation of files, by triggering a controlled\u00a04-byte write\u00a0into a page cache page belonging to any file readable by the attacker.<\/p>\n<p>\n<iframe loading=\"lazy\" title=\"demo\" width=\"640\" height=\"480\" src=\"https:\/\/www.youtube.com\/embed\/5AjpiKaS6g8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/p>\n<p>Because the Linux kernel never marks the corrupted page as dirty for writeback, the on-disk file remains untouched, causing standard checksum-based file integrity tools to miss the modification entirely. The attacker then executes the corrupted in-memory version of a setuid binary such as \/usr\/bin\/su, achieving root shell execution.<\/p>\n<p>The vulnerability originates from a 2017 in-place optimization introduced to algif_aead.c (commit 72548b093ee3). When a user splices a file into a pipe and feeds it into an AF_ALG socket, the AEAD input scatterlist holds direct references to the kernel\u2019s physical page cache pages of that file \u2014 not copies.<\/p>\n<p>For AEAD decryption operations, algif_aead.c set req-src =&#8230;<\/p>\n<p><a href=\"https:\/\/cybersecuritynews.com\/linux-kernel-0-day-copy-fail\/\">Source<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux Kernel 0-Day &#8220;Copy Fail&#8221; Roots Every Major Distribution Since 2017 https:\/\/cybersecuritynews.com\/linux-kernel-0-day-copy-fail\/ Publish Date: 2026-05-01&#8230;<\/p>\n","protected":false},"author":1,"featured_media":237990,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"http:\/\/cybersecuritynews.com\/wp-content\/uploads\/2026\/04\/Linux-Kernel-0-Day-Copy-Fail.webp","fifu_image_alt":"","footnotes":""},"categories":[48],"tags":[90,31,89,71,27],"class_list":["post-237989","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","tag-cve","tag-exploit","tag-flaw","tag-linux","tag-vulnerability"],"_links":{"self":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/237989"}],"collection":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/comments?post=237989"}],"version-history":[{"count":1,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/237989\/revisions"}],"predecessor-version":[{"id":237991,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/237989\/revisions\/237991"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media\/237990"}],"wp:attachment":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media?parent=237989"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/categories?post=237989"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/tags?post=237989"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}