{"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\/hr\/blog\/news\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","title":{"rendered":"GRO Frag \u2014 sedma ranjivost klase Copy Fail, koja omogu\u0107ava root pristup u Linux-u","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Javno je objavljen exploit za sedmu ranjivost (1, 2-3, 4, 5, 6) u Linux kernelu, koja omogu\u0107ava neprivilegiranom lokalnom korisniku da dobije root prava, prepisuju\u0107i podatke u stran\u010dnom ke\u0161u. CVE identifikator jo\u0161 nije dodijeljen, osim koda exploita, informacije o problemu za sada nema. Ispravka je dostupna samo u obliku patch-a, koji je objavljen 20. maja, a 21. maja je prihva\u0107en u glavnu granu Linux kernela (ispravci kernela jo\u0161 nisu dostupni). <\/p>\n

Ranljivost se nalazi u implementaciji tehnologije GRO (Generic Receive Offload), koja se koristi za ubrzavanje obrade segmentiranih paketa. Ranljivost je uzrokovana gre\u0161kom u implementaciji mehanizma zerocopy u funkciji skb_gro_receive(), koja vr\u0161i direktnu izmjenu podataka u stranici ke\u0161a kako bi se izbjeglo nepotrebno baferisanje. Kada je uklju\u010den zastavica SKBFL_MANAGED_FRAG_REFS, presko\u010deno je \u010duvanje reference na oslobo\u0111ene stranice memorije u polju shinfo->frags, nakon \u010dega se to polje povezivalo s drugim skb-om bez promjene broja referenci, \u0161to je dovelo do pristupa memoriji nakon njenog osloba\u0111anja (use-after-free). Problem je uspje\u0161no iskori\u0161ten za prepisivanje podataka u stranici ke\u0161a, zahvaljuju\u0107i manipulaciji sa pokaziva\u010dem na bafer io_uring. <\/p>\n

Napad je mogu\u0107 na sistemima sa uklju\u010denom podsistemom io_uring (io_uring_disabled=0). Da bi eksploatacija radila, u sistemu mora biti dostupan za \u010ditanje izvr\u0161ni fajl sa SUID-root zastavicom. Mehanizam eksploatacije se svodi na to da napada\u010d postigne oslanjanje baze korisnika u stranici ke\u0161a, nakon \u010dega umetne u ke\u0161 string «hax::0:0::\/root:\/bin\/sh». Zatim se pokre\u0107e komanda «su hax», koja dobija ne originalnu bazu korisnika sa skladi\u0161ta, ve\u0107 izmijenjenu verziju sa podmetnutim korisni\u010dkim imenom «hax», kojem su dodeljena prava root i prazan password. Eksploatacija je testirana na Ubuntu 24.04.
\n
Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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 sedma ranjivost klase Copy Fail, koja pru\u017ea root prava u Linuxu | ProHoster","description":"Javno je objavljen exploit za sedmu ranjivost (1, 2-3, 4, 5, 6) u Linux kernelu, koja omogu\u0107ava neprivilegiranom lokalnom korisniku da dobije root prava, prepisuju\u0107i podatke u stran\u010dnom 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\u043a\u044d\u0448\u0435.","og:url":"https:\/\/prohoster.info\/hr\/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\/hr\/wp-json\/wp\/v2\/posts\/181668","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/comments?post=181668"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/posts\/181668\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/media?parent=181668"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/categories?post=181668"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/tags?post=181668"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}