{"id":60562,"date":"2026-04-30T00:01:50","date_gmt":"2026-04-30T00:01:50","guid":{"rendered":"https:\/\/www.threatshub.org\/blog\/linux-cryptographic-code-flaw-offers-fast-route-to-root\/"},"modified":"2026-04-30T00:01:50","modified_gmt":"2026-04-30T00:01:50","slug":"linux-cryptographic-code-flaw-offers-fast-route-to-root","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/linux-cryptographic-code-flaw-offers-fast-route-to-root\/","title":{"rendered":"Linux cryptographic code flaw offers fast route to root"},"content":{"rendered":"<p>Developers of major Linux distributions have begun shipping patches to address a local privilege escalation (LPE) vulnerability arising from a logic flaw.<\/p>\n<p>The newly disclosed LPE, dubbed <a href=\"https:\/\/copy.fail\" rel=\"nofollow\">Copy Fail<\/a> (CVE-2026-31431), comes from a vulnerability in the Linux kernel&#8217;s <code>authencesn<\/code> cryptographic template.<\/p>\n<p>&#8220;An unprivileged local user can write four controlled bytes into the page cache of any readable file on a Linux system, and use that to gain root,&#8221; the writeup from security biz <a href=\"https:\/\/theori.io\" rel=\"nofollow\">Theori<\/a> explains.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"condor\" data-xsm=\",fluid,mpu,dmpu,\" data-sm=\",fluid,mpu,dmpu,\" data-md=\",fluid,mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_software\/oses&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2afLy7_XpAfINyE8sQLNU8QAAAJI&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_software\/oses&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=2&amp;c=2afLy7_XpAfINyE8sQLNU8QAAAJI&amp;t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The kernel reads the page cache when it loads a binary, so modifying the cached copy amounts to altering the binary for the purpose of program execution. But doing so doesn&#8217;t trigger any defenses focused on file system events like <a href=\"https:\/\/man7.org\/linux\/man-pages\/man7\/inotify.7.html\" rel=\"nofollow\">inotify<\/a>.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xmd=\",fluid,mpu,leaderboard,\" data-lg=\",fluid,mpu,leaderboard,\" data-xlg=\",fluid,billboard,superleaderboard,mpu,leaderboard,\" data-xxlg=\",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_software\/oses&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44afLy7_XpAfINyE8sQLNU8QAAAJI&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_software\/oses&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44afLy7_XpAfINyE8sQLNU8QAAAJI&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<div class=\"adun_eagle_desktop_story_wrapper\">\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"mid\" data-raptor=\"eagle\" data-xxlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_software\/oses&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33afLy7_XpAfINyE8sQLNU8QAAAJI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_software\/oses&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33afLy7_XpAfINyE8sQLNU8QAAAJI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<\/p><\/div>\n<p>The <a href=\"https:\/\/github.com\/theori-io\/copy-fail-CVE-2026-31431\/blob\/main\/copy_fail_exp.py\" rel=\"nofollow\">proof of concept exploit<\/a> is a 10-line, 732-byte Python script capable of editing a <code>setuid<\/code> binary to gain root on almost all Linux distributions released since 2017.<\/p>\n<p>Copy Fail is similar to other LPE bugs such as Dirty Cow and Dirty Pipe, but its finders claim it doesn&#8217;t require winning a race condition and it&#8217;s more broadly applicable.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" data-pos=\"top\" data-raptor=\"falcon\" data-xsm=\",fluid,mpu,dmpu,\" data-sm=\",fluid,mpu,dmpu,\" data-md=\",fluid,mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_software\/oses&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44afLy7_XpAfINyE8sQLNU8QAAAJI&amp;t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_software\/oses&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=4&amp;c=44afLy7_XpAfINyE8sQLNU8QAAAJI&amp;t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>It&#8217;s not remotely exploitable on its own \u2013 hence LPE \u2013 but if chained with a web RCE, malicious CI runner, or SSH compromise, it could be relevant to an external attacker. The bug is of most immediate concern to those using multi-tenant Linux systems, shared-kernel containers, or CI runners that execute untrusted code.<\/p>\n<p>According to Theori, the vulnerability also represents a potential container escape primitive that could affect Kubernetes nodes, because the page cache is shared across the host.<\/p>\n<p>Linux distros <a href=\"https:\/\/security-tracker.debian.org\/tracker\/CVE-2026-31431\" rel=\"nofollow\">Debian<\/a>, <a href=\"https:\/\/ubuntu.com\/security\/CVE-2026-31431\" rel=\"nofollow\">Ubuntu<\/a>, and <a href=\"https:\/\/www.suse.com\/security\/cve\/CVE-2026-31431.html\" rel=\"nofollow\">SUSE<\/a> have issued patches for the problem, as have overseers of other distros.<\/p>\n<p>Red Hat initially said it was going to <a target=\"_blank\" rel=\"nofollow\" href=\"https:\/\/news.ycombinator.com\/item?id=47953340\">defer the fix<\/a> but later changed its<\/p>\n<p><a href=\"https:\/\/access.redhat.com\/security\/cve\/cve-2026-31431\" rel=\"nofollow\">guidance<\/a> to indicate it will go along with other distros and patch promptly.<\/p>\n<div aria-hidden=\"true\" class=\"adun\" id=\"story_eagle_xsm_sm_md_xmd_lg_xlg\" data-pos=\"mid\" data-raptor=\"eagle\" data-xsm=\",mpu,dmpu,\" data-sm=\",mpu,dmpu,\" data-md=\",mpu,dmpu,\" data-xmd=\",mpu,dmpu,\" data-lg=\",mpu,dmpu,\" data-xlg=\",mpu,dmpu,\"> <noscript> <a href=\"https:\/\/pubads.g.doubleclick.net\/gampad\/jump?co=1&amp;iu=\/6978\/reg_software\/oses&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33afLy7_XpAfINyE8sQLNU8QAAAJI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" target=\"_blank\"> <img decoding=\"async\" src=\"https:\/\/pubads.g.doubleclick.net\/gampad\/ad?co=1&amp;iu=\/6978\/reg_software\/oses&amp;sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&amp;tile=3&amp;c=33afLy7_XpAfINyE8sQLNU8QAAAJI&amp;t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0\" alt> <\/a> <\/noscript> <\/div>\n<p>The CVE has been rated High severity, <a href=\"https:\/\/github.com\/advisories\/GHSA-2274-3hgr-wxv6\" rel=\"nofollow\">7.8 out of 10<\/a>.<\/p>\n<p>Theori researcher Taeyang Lee identified the vulnerability, with the help of the company&#8217;s AI security scanning software, Xint Code.<\/p>\n<p>The number of bug reports has surged in recent months, helped by <a href=\"https:\/\/www.theregister.com\/2026\/04\/06\/ai_coding_tools_more_work\/\">AI-powered flaw-finders<\/a>. Microsoft just reported the second largest number of patches ever.<\/p>\n<p>Dustin Childs, head of threat awareness for Trend Micro&#8217;s Zero Day Initiative, expects this is due to security teams using AI to hunt bugs. &#8220;There are many things we could speculate on to justify the size, but if Microsoft is like the other programs out there (including ours), they are likely seeing a rise in submissions found by AI tools,&#8221; he <a href=\"https:\/\/www.zerodayinitiative.com\/blog\/2026\/4\/14\/the-april-2026-security-update-review\" rel=\"nofollow\">wrote<\/a> earlier this month.<\/p>\n<p>AI-assisted vulnerability research recently prompted the Internet Bug Bounty (IBB) program to suspend awards until it can understand how to manage the growing volume of reports. \u00ae<\/p>\n<p> READ MORE <a href=\"https:\/\/go.theregister.com\/feed\/www.theregister.com\/2026\/04\/30\/linux_cryptographic_code_flaw\/\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Patches land for authencesn flaw enabling local privilege escalation Developers of major Linux distributions have begun shipping patches to address a local privilege escalation (LPE) vulnerability arising from a logic flaw.\u2026 READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[],"class_list":["post-60562","post","type-post","status-publish","format-standard","hentry","category-the-register"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Linux cryptographic code flaw offers fast route to root 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat 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