{"id":243616,"date":"2026-05-11T08:55:00","date_gmt":"2026-05-11T12:55:00","guid":{"rendered":"https:\/\/news-you-need.com\/index.php\/2026\/05\/11\/linux-developers-weigh-emergency-killswitch-for-vulnerable-kernel-functions\/"},"modified":"2026-05-11T09:05:08","modified_gmt":"2026-05-11T13:05:08","slug":"linux-developers-weigh-emergency-killswitch-for-vulnerable-kernel-functions","status":"publish","type":"post","link":"https:\/\/news-you-need.com\/index.php\/2026\/05\/11\/linux-developers-weigh-emergency-killswitch-for-vulnerable-kernel-functions\/","title":{"rendered":"Linux developers weigh emergency “killswitch” for vulnerable kernel functions"},"content":{"rendered":"

Linux developers weigh emergency “killswitch” for vulnerable kernel functions<\/a><\/p>\n

https:\/\/www.helpnetsecurity.com\/2026\/05\/11\/linux-kernel-emergency-killswitch\/<\/a><\/p>\n

Publish Date: 2026-05-11 08:55:00<\/a><\/p>\n

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

Linux kernel developers are reviewing a proposal for an emergency risk mitigation mechanism (\u201cKillswitch\u201d) that would allow administrators to disable vulnerable kernel functions at runtime.<\/p>\n

The proposal, submitted by Linux kernel developer\/maintainer Sasha Levin, arrives in the wake of the public disclosure of two privilege escalation vulnerabilities affecting the Linux kernel.<\/p>\n

What prompted the proposal<\/h3>\n

The impetus for the proposal is explicit: the patch\u2019s selftest references Copy Fail (CVE-2026-31431), a nine-year-old local privilege escalation flaw in the AF_ALG cryptographic socket interface disclosed by researchers at Theori on April 29. <\/p>\n

The flaw allows an unprivileged local user to write four controlled bytes into the kernel page cache of any readable file, reliably achieving root without needing to win a race condition. <\/p>\n

Copy Fail\u2019s disclosure process was chaotic: Linux kernel developers were notified in advance and had time to work on a fix, but various Linux distributions were still working on issuing patched kernel packages when Theori researchers published a working proof-of-concept exploit.<\/p>\n

Dirty Frag was publicly disclosed on May 7 by researcher Hyunwoo Kim, who privately reported CVE-2026-43284 and CVE-2026-43500, which together \u201cmake\u201d Dirty Frag, to kernel maintainers on April 29\u201330. <\/p>\n

But when a patch for CVE-2026-43284 got merged on May 5, it didn\u2019t take long for another researcher to analyze it, create a working exploit, and publish it, forcing Kim to proceed with public disclosure before the agreed-upon embargo window ended. <\/p>\n

(The researcher in question didn\u2019t know about the embargo. \u201cThe work is n-day weaponization from a public upstream commit, which is standard practice once a security-relevant fix lands in a public tree,\u201d he noted.)<\/p>\n

Copy Fail demonstrated that due to a poor understanding of the intricacies of the process, even well-intentioned disclosure can leave distros scrambling. Dirty Frag demonstrated…<\/p>\n

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

Linux developers weigh emergency “killswitch” for vulnerable kernel functions https:\/\/www.helpnetsecurity.com\/2026\/05\/11\/linux-kernel-emergency-killswitch\/ Publish Date: 2026-05-11 08:55:00 Source…<\/p>\n","protected":false},"author":1,"featured_media":243618,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/img.helpnetsecurity.com\/wp-content\/uploads\/2026\/05\/11144606\/linux-tux.webp","fifu_image_alt":"","footnotes":""},"categories":[48],"tags":[90,31,89,71,57],"class_list":["post-243616","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","tag-cve","tag-exploit","tag-flaw","tag-linux","tag-security"],"_links":{"self":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/243616"}],"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=243616"}],"version-history":[{"count":1,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/243616\/revisions"}],"predecessor-version":[{"id":243620,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/posts\/243616\/revisions\/243620"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media\/243618"}],"wp:attachment":[{"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/media?parent=243616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/categories?post=243616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/news-you-need.com\/index.php\/wp-json\/wp\/v2\/tags?post=243616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}