{"id":239387,"date":"2026-05-04T10:36:00","date_gmt":"2026-05-04T14:36:00","guid":{"rendered":"https:\/\/news-you-need.com\/index.php\/2026\/05\/04\/cisa-flags-actively-exploited-copy-fail-linux-kernel-flaw-enabling-root-takeover-across-major-distros-unpatched-systems-may-remain-vulnerable-to-attack\/"},"modified":"2026-05-05T07:00:12","modified_gmt":"2026-05-05T11:00:12","slug":"cisa-flags-actively-exploited-copy-fail-linux-kernel-flaw-enabling-root-takeover-across-major-distros-unpatched-systems-may-remain-vulnerable-to-attack","status":"publish","type":"post","link":"https:\/\/news-you-need.com\/index.php\/2026\/05\/04\/cisa-flags-actively-exploited-copy-fail-linux-kernel-flaw-enabling-root-takeover-across-major-distros-unpatched-systems-may-remain-vulnerable-to-attack\/","title":{"rendered":"CISA flags actively exploited \u2018Copy Fail\u2019 Linux kernel flaw enabling root takeover across major distros \u2014 unpatched systems may remain vulnerable to attack"},"content":{"rendered":"

CISA flags actively exploited \u2018Copy Fail\u2019 Linux kernel flaw enabling root takeover across major distros \u2014 unpatched systems may remain vulnerable to attack<\/a><\/p>\n

https:\/\/www.tomshardware.com\/software\/linux\/cisa-flags-actively-exploited-copy-fail-linux-kernel-flaw-enabling-root-takeover-across-major-distros-unpatched-systems-may-remain-vulnerable-to-attack<\/a><\/p>\n

Publish Date: 2026-05-04 10:36:00<\/a><\/p>\n

Source Domain: www.tomshardware.com<\/a><\/p>\n

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added a newly disclosed Linux vulnerability, dubbed \u201cCopy Fail,\u201d to its Known Exploited Vulnerabilities catalog on May 1st, warning that the flaw, tracked as CVE-2026-31431, is already being used in active attacks and urging rapid patching across affected systems.<\/p>\n

Tom’s Hardware Premium Roadmaps<\/p>\n

\n

(Image credit: Future)<\/span><\/p>\n

The vulnerability resides in the Linux kernel\u2018s \u201calgif_aead\u201d cryptographic interface and allows unprivileged local users to escalate privileges to root. In practice, this means an attacker with limited access to a system can gain full administrative control.<\/p>\n

Security researchers at Theori disclosed the flaw publicly last week, releasing a working proof-of-concept exploit alongside their findings. According to the team, the exploit is \u201c100% reliable\u201d and functions without modification across multiple major Linux distributions, including Ubuntu 24.04 LTS, Amazon Linux 2023, RHEL 10.1, and SUSE 16. That level of portability is unusual and lowers the barrier for attackers seeking to weaponize the bug.<\/p>\n

Article continues below <\/span>
\n
\n You may like
\n <\/span><\/p>\n

At a technical level, the bug enables attackers to write controlled data into the kernel\u2018s page cache, a low-level memory structure, ultimately allowing privilege escalation. While the exploit requires local access, it still allows attackers to break out of standard user restrictions and gain full control of the system.<\/p>\n

Compounding the risk, a discussion on the Openwall oss-security mailing list suggests that the vulnerability and the working exploit were publicly disclosed without prior coordination with Linux distribution maintainers. In typical responsible disclosure processes, vendors are given advance notice to prepare and distribute patches before technical details are made public.<\/p>\n

In this case, however, maintainers indicated that no such heads-up was provided, leaving some distributions…<\/p>\n

Source<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

CISA flags actively exploited \u2018Copy Fail\u2019 Linux kernel flaw enabling root takeover across major distros…<\/p>\n","protected":false},"author":1,"featured_media":239388,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/cdn.mos.cms.futurecdn.net\/Nhs4yvdLbHSMdgjnZmv4wn-1024-80.jpg","fifu_image_alt":"","footnotes":""},"categories":[48],"tags":[90,31,89,71,57,79,27],"class_list":["post-239387","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","tag-cve","tag-exploit","tag-flaw","tag-linux","tag-security","tag-ubuntu","tag-vulnerability"],"_links":{"self":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/239387"}],"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=239387"}],"version-history":[{"count":1,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/239387\/revisions"}],"predecessor-version":[{"id":239389,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/239387\/revisions\/239389"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media\/239388"}],"wp:attachment":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media?parent=239387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/categories?post=239387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/tags?post=239387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}