{"id":60612,"date":"2026-05-08T13:36:08","date_gmt":"2026-05-08T13:36:08","guid":{"rendered":"https:\/\/www.theregister.com\/a\/5237230"},"modified":"2026-05-08T13:36:08","modified_gmt":"2026-05-08T13:36:08","slug":"dirty-frag-linux-flaw-one-ups-copyfail-with-no-patches-and-public-root-exploit","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/dirty-frag-linux-flaw-one-ups-copyfail-with-no-patches-and-public-root-exploit\/","title":{"rendered":"&#8216;Dirty Frag&#8217; Linux flaw one-ups CopyFail with no patches and public root exploit"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/image.theregister.com\/5237244.jpg?imageId=5237244&amp;x=0&amp;y=0&amp;cropw=100&amp;croph=100&amp;panox=0&amp;panoy=0&amp;panow=100&amp;panoh=100&amp;width=1200&amp;height=683\" class=\"ff-og-image-inserted\"><\/div>\n<div data-element-guid=\"d11159dd-82a3-4c53-901c-d41dec75505c\" readability=\"31.565217391304\">\n<p class=\"kicker \">Security<\/p>\n<p class=\"subtitle \">Broken disclosure embargo left admins facing a fresh root-level flaw with no CVE<\/p>\n<\/p><\/div>\n<div data-element-guid=\"4c9dc5d9-c886-4348-bf4a-01d0dc71377d\" readability=\"88.069333333333\">\n<p>A fresh Linux privilege escalation bug dubbed &#8220;Dirty Frag&#8221; has dropped into the wild with no patches, no CVE, and a public exploit that hands attackers root access across major distributions.<\/p>\n<p>Security researcher Hyunwoo Kim <a href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2026\/05\/07\/8\">disclosed<\/a> the local privilege escalation flaw on Friday after what he said was a broken embargo forced the issue into the open.&nbsp;<\/p>\n<p>Kim described Dirty Frag as a &#8220;universal LPE&#8221; affecting &#8220;all major distributions&#8221; and warned that it delivers the same kind of immediate root access as the recent CopyFail mess \u2013 only this time, defenders do not even have patches to throw at the problem.<\/p>\n<p>&#8220;As with the previous Copy Fail vulnerability, Dirty Frag likewise allows immediate root privilege escalation on all major distributions,&#8221; Kim said. &#8220;Because the responsible disclosure schedule and embargo have been broken, no patches exist for any distribution.&#8221;<\/p>\n<p>Dirty Frag works by chaining together two separate Linux kernel flaws. One sits in the xfrm-ESP subsystem and dates back to a January 2017 kernel commit, according to Kim, while the second vulnerability affects RxRPC functionality introduced in 2023.<\/p>\n<p>Together, the two bugs allegedly let unprivileged local users overwrite protected files in memory and claw their way to root. A long list of distributions in the firing line, according to Kim, including Ubuntu, Red Hat Enterprise Linux, CentOS Stream, Fedora, AlmaLinux, and openSUSE Tumbleweed.<\/p>\n<div data-element-guid=\"96b76d57-860c-4d1e-84c3-0e4d1e1567e3\" class=\"lab4 column articleList layout_vertical imageLayout_left small-12 large-12 small-abs-12 large-abs-12 abs_grid_12 grid-vas-start mobile-grid-vas-start\">\n<div class=\"content border_width_0 border_width_mobile_0 border-radius-48 border-radius-mobile_48\">\n<h2 class=\"article-list-title t19 font-RobotoCondensed\">MORE CONTEXT<\/h2>\n<\/p><\/div>\n<\/div>\n<p>Separately, researchers appear to have independently reverse-engineered part of the bug chain from a publicly visible kernel fix commit before the embargo expired, adding to the disclosure mess already surrounding the flaw. One GitHub project titled &#8220;<a href=\"https:\/\/github.com\/0xdeadbeefnetwork\/Copy_Fail2-Electric_Boogaloo\">Copy Fail 2: Electric Boogaloo<\/a>&#8221; claims to weaponize the ESP\/xfrm side of the issue separately from Kim&#8217;s full Dirty Frag chain.<\/p>\n<p>Kim said maintainers signed off on the disclosure of the flaw after somebody else dumped exploit details online first, collapsing the embargo before patches were finished. So now the exploit is public, the fixes are not, and Linux admins get another long week.<\/p>\n<p>The disclosure comes as the industry is still dealing with <a href=\"https:\/\/www.theregister.com\/security\/2026\/05\/05\/copyfail-attackers-start-cashing-in-on-linux-flaw\/5226930\">the fallout from CopyFail<\/a>, another Linux privilege escalation bug that recently landed in CISA&#8217;s Known Exploited Vulnerabilities catalog after attackers started cashing in on it in the wild.<\/p>\n<p>But Dirty Frag makes the recent CopyFail chaos look relatively organized. There&#8217;s still no CVE, no coordinated patch rollout, and not much in the way of mitigation.<\/p>\n<p>Kim published a temporary workaround that disables affected ESP and RxRPC modules before clearing the system page cache. Useful, perhaps, although &#8220;turn bits of the kernel off and hope for the best&#8221; is not usually the sort of guidance admins enjoy seeing.&nbsp;\u00ae<\/p>\n<\/p><\/div>\n<p><img decoding=\"async\" src=\"https:\/\/image.theregister.com\/?imageId=5237244&#038;width=800\">READ MORE <a href=\"https:\/\/www.theregister.com\/security\/2026\/05\/08\/dirty-frag-linux-flaw-one-ups-copyfail-with-no-patches-and-public-root-exploit\/5237230\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p> Broken disclosure embargo left admins facing a fresh root-level flaw with no CVE READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":60613,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[63],"tags":[307],"class_list":["post-60612","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-register","tag-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>&#039;Dirty Frag&#039; Linux flaw one-ups CopyFail with no patches and public root exploit 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 Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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