{"id":181668,"date":"2026-05-23T00:25:11","date_gmt":"2026-05-22T22:25:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux"},"modified":"2026-05-23T00:25:11","modified_gmt":"2026-05-22T22:25:11","slug":"gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","title":{"rendered":"GRO Frag \u2014 siedma zranite\u013enos\u0165 triedy Copy Fail, poskytuj\u00faca pr\u00e1va root v Linuxe","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Na verejnosti je zverejnen\u00fd exploit pre siedmu zranite\u013enos\u0165 (1, 2-3, 4, 5, 6) v jadre Linuxu, ktor\u00fd umo\u017e\u0148uje nepriviligovan\u00e9mu lok\u00e1lnemu pou\u017e\u00edvate\u013eovi z\u00edska\u0165 pr\u00e1va root prep\u00edsan\u00edm \u00fadajov v str\u00e1nkovom cache. CVE identifik\u00e1tor e\u0161te nebol pridelen\u00fd, okrem k\u00f3du exploitu nie s\u00fa zatia\u013e k dispoz\u00edcii \u017eiadne \u010fal\u0161ie inform\u00e1cie o probl\u00e9me. Oprava je k dispoz\u00edcii iba vo forme z\u00e1platy, ktor\u00e1 bola zverejnen\u00e1 20. m\u00e1ja a 21. m\u00e1ja bola prijat\u00e1 do hlavnej vetvy jadra Linuxu (opraven\u00e9 verzie jadra zatia\u013e nie s\u00fa dostupn\u00e9). <\/p>\n

Zranite\u013enos\u0165 sa nach\u00e1dza v implement\u00e1cii technol\u00f3gie GRO (Generic Receive Offload), ktor\u00e1 sa pou\u017e\u00edva na ur\u00fdchlenie spracovania segmentovan\u00fdch paketov. Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 chybou v implement\u00e1cii mechanizmu zerocopy vo funkcii skb_gro_receive(), ktor\u00e1 priamo men\u00ed \u00fadaje v str\u00e1nkovom cache s cie\u013eom vyl\u00fa\u010di\u0165 zbyto\u010dn\u00e9 vyrovn\u00e1vanie. Pri nain\u0161talovanom pr\u00edznaku SKBFL_MANAGED_FRAG_REFS sa presko\u010dilo ulo\u017eenie odkazu na uvo\u013enen\u00e9 str\u00e1nky pam\u00e4te v poli shinfo->frags, po \u010dom sa toto pole pripojilo k in\u00e9mu skb bez zmeny po\u010d\u00edtadla odkazov, \u010do viedlo k pr\u00edstupu k pam\u00e4ti po jej uvo\u013enen\u00ed (use-after-free). Probl\u00e9m sa podarilo vyu\u017ei\u0165 na prep\u00edsanie \u00fadajov v str\u00e1nkovom cache manipulovan\u00edm s ukazovate\u013eom na buffer io_uring. <\/p>\n

\u00datok je mo\u017en\u00fd na syst\u00e9my s povolenou subsyst\u00e9mom io_uring (io_uring_disabled=0). Pre fungovanie exploit-u mus\u00ed by\u0165 v syst\u00e9me dostupn\u00fd na \u010d\u00edtanie spustite\u013en\u00fd s\u00fabor s pr\u00edznakom SUID-root. Mechanizmus exploitu spo\u010d\u00edva v tom, \u017ee \u00fato\u010dn\u00edk dosiahne usadenie datab\u00e1zy pou\u017e\u00edvate\u013eov v str\u00e1nkovom cache, po \u010dom do cache vlo\u017e\u00ed re\u0165azec «hax::0:0::\/root:\/bin\/sh». N\u00e1sledne sa spust\u00ed pr\u00edkaz «su hax», ktor\u00fd z\u00edska nie p\u00f4vodn\u00fa datab\u00e1zu pou\u017e\u00edvate\u013eov z \u00falo\u017eiska, ale zmenen\u00fa k\u00f3piu so falo\u0161n\u00fdm prihl\u00e1sen\u00edm «hax», ktor\u00e9mu s\u00fa priraden\u00e9 pr\u00e1va root a pr\u00e1zdne heslo. Fungovanie exploitu bolo testovan\u00e9 na Ubuntu 24.04.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u0434\u043b\u044f \u0441\u0435\u0434\u044c\u043c\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5, 6) \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0447\u043d\u043e\u043c \u043a\u044d\u0448\u0435. CVE-\u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u0435\u0449\u0451 \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d, \u043a\u0440\u043e\u043c\u0435 \u043a\u043e\u0434\u0430 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0435 \u043f\u043e\u043a\u0430 \u043d\u0435\u0442. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u0438\u0434\u0435 \u043f\u0430\u0442\u0447\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d 20 \u043c\u0430\u044f \u0438 21 \u043c\u0430\u044f \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-181668","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47GRO Frag \u2014 siedma zranite\u013enos\u0165 triedy Copy Fail, poskytuj\u00faca pr\u00e1va root v Linuxe | ProHoster","description":"Na verejnosti je zverejnen\u00fd exploit pre siedmu zranite\u013enos\u0165 (1, 2-3, 4, 5, 6) v jadre Linuxu, ktor\u00fd umo\u017e\u0148uje nepriviligovan\u00e9mu lok\u00e1lnemu pou\u017e\u00edvate\u013eovi z\u00edska\u0165 pr\u00e1va root prep\u00edsan\u00edm \u00fadajov v str\u00e1nkovom cache.","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47GRO Frag \u2014 \u0441\u0435\u0434\u044c\u043c\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043b\u0430\u0441\u0441\u0430 Copy Fail, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u0440\u0430\u0432\u0430 root \u0432 Linux | ProHoster","og:description":"\u0412 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u0434\u043b\u044f \u0441\u0435\u0434\u044c\u043c\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5, 6) \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0447\u043d\u043e\u043c \u043a\u044d\u0448\u0435.","og:url":"https:\/\/prohoster.info\/sk\/blog\/news\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2026-05-22T22:25:11+00:00","article:modified_time":"2026-05-22T22:25:11+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts\/181668","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/comments?post=181668"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/posts\/181668\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/media?parent=181668"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/categories?post=181668"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/sk\/wp-json\/wp\/v2\/tags?post=181668"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}