{"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\/it\/blog\/news\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","title":{"rendered":"GRO Frag \u2014 la settima vulnerabilit\u00e0 di classe Copy Fail, che fornisce diritti di root in Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stato reso pubblico un exploit per la settima vulnerabilit\u00e0 (1, 2-3, 4, 5, 6) nel kernel Linux, che consente a un utente locale non privilegiato di ottenere i diritti di root sovrascrivendo i dati nella cache delle pagine. L'identificatore CVE non \u00e8 ancora stato assegnato, e oltre al codice dell'exploit al momento non ci sono ulteriori informazioni sul problema. La correzione \u00e8 disponibile solo sotto forma di patch, pubblicata il 20 maggio e accettata nel ramo principale del kernel Linux il 21 maggio (le versioni correttive del kernel non sono ancora disponibili). <\/p>\n<p>La vulnerabilit\u00e0 \u00e8 presente nell'implementazione della tecnologia GRO (Generic Receive Offload), utilizzata per accelerare l'elaborazione dei pacchetti segmentati. La vulnerabilit\u00e0 \u00e8 causata da un errore nell'implementazione del meccanismo zerocopy nella funzione skb_gro_receive(), che modifica direttamente i dati nella cache delle pagine per escludere un eccessivo buffering. Con il flag SKBFL_MANAGED_FRAG_REFS attivato, veniva omesso il salvataggio del riferimento alle pagine di memoria rilasciate nel campo shinfo-&gt;frags, dopo di che questo campo veniva unito a un altro skb senza modificare il contatore dei riferimenti, il che portava a un accesso alla memoria dopo il suo rilascio (use-after-free). Il problema \u00e8 stato sfruttato per riscrivere i dati nella cache delle pagine, grazie alla manipolazione del puntatore al buffer io_uring. <\/p>\n<p>L'attacco \u00e8 possibile su sistemi con il sottosistema io_uring attivo (io_uring_disabled=0). Per il funzionamento dell'exploit, deve essere disponibile sulla macchina un file eseguibile con il flag SUID-root accessibile in lettura. Il meccanismo di sfruttamento consiste nel far s\u00ec che l'attaccante ottenga una copia della base utenti nella cache delle pagine, dopo di che inserisce nella cache la stringa &#171;hax::0:0::\/root:\/bin\/sh&#187;. Successivamente viene lanciato il comando &#171;su hax&#187;, che riceve non la copia originale della base utenti dal disco, ma una copia modificata con l'accesso utente &#171;hax&#187;, a cui sono stati concessi privilegi di root e password vuota. Il funzionamento dell'exploit \u00e8 stato testato su Ubuntu 24.04.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65504\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 [&hellip;]<\/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<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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tipo Copy Fail, che fornisce diritti di root in Linux | ProHoster","description":"\u00c8 stato reso pubblico un exploit per la settima vulnerabilit\u00e0 (1, 2-3, 4, 5, 6) nel kernel Linux, che consente a un utente locale non privilegiato di ottenere i diritti di root sovrascrivendo i dati nella cache delle pagine.","canonical_url":"https:\/\/prohoster.info\/it\/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":"it_IT","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 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