{"id":182539,"date":"2026-07-08T10:54:16","date_gmt":"2026-07-08T08:54:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa"},"modified":"2026-07-08T10:54:16","modified_gmt":"2026-07-08T08:54:16","slug":"bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa","title":{"rendered":"Bad Epoll: \u00e8 stata trovata una vulnerabilit\u00e0 in Linux e Android per ottenere accesso root.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

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1 <\/p>\n

Nel kernel di Linux \u00e8 stata scoperta una vulnerabilit\u00e0 Bad Epoll<\/strong>, registrata come CVE-2026-46242<\/a>. Essa consente a un normale utente locale senza diritti speciali di aumentare i propri privilegi a root. Secondo l'autore dello studio, Jayon Chong, il problema colpisce non solo i desktop e i server Linux, ma anche alcuni dispositivi Android su nuove versioni del kernel \u2014 questo \u00e8 sottolineato separatamente in una descrizione di Bad Epoll<\/a>.<\/p>\n

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L'errore si trova nel sottosistema epoll<\/strong> \u2014 il meccanismo standard di Linux per monitorare molteplici descrittori di file, connessioni di rete e eventi di input\/output. Questi meccanismi sono ampiamente utilizzati da server, browser e servizi di rete, quindi non \u00e8 possibile semplicemente disabilitare epoll. In un'analisi tecnica<\/a> la vulnerabilit\u00e0 \u00e8 descritta come un race condition, che porta a use-after-free<\/strong>: quando due oggetti epoll correlati vengono chiusi simultaneamente, un thread libera le strutture interne, mentre l'altro continua ad accedervi.<\/p>\n

<\/noindex> <\/p>\n

In particolare, il problema si presenta quando un epoll descriptor monitora un altro, e entrambi i descrittori vengono chiusi in parallelo. Dopo la chiamata a __ep_remove(), il campo file->f_ep viene temporaneamente azzerato, e un __fput() in competizione potrebbe concludere che un'ulteriore pulizia non \u00e8 pi\u00f9 necessaria. Di conseguenza, l'oggetto struct eventpoll o il struct file associato viene liberato troppo presto, mentre il codice continua a lavorare con i puntatori alla memoria gi\u00e0 liberata. Questo offre all'attaccante un primitivo per il danneggiamento della memoria del kernel.<\/p>\n

<\/p>\n

Non sono necessarie capabilities aggiuntive e non sono necessari user namespaces per l'attacco \u2014 \u00e8 sufficiente avere CONFIG_EPOLL, il che rende il problema particolarmente sgradevole per i normali sistemi Linux. Secondo il rapporto iniziale del ricercatore<\/a>, il bug \u00e8 stato introdotto nel kernel con il commit 58c9b016e128<\/a> nel 2023, e corretto con il commit a6dc643c693<\/a>.<\/p>\n

<\/noindex> <\/p>\n

Nonostante la finestra di competizione molto ristretta, il ricercatore ha preparato un exploit funzionante per Google kernelCTF. In la descrizione dell'exploit<\/a> Mostra come un errore si trasforma in un record di 8 byte in una struttura liberata, quindi in una perdita di memoria del kernel tramite \/proc\/self\/fdinfo, intercettando file->f_op->poll e una catena ROP per ottenere i privilegi di root. Per l'obiettivo lts-6.12.67 \u00e8 dichiarata una stabilit\u00e0 di circa il 99%, per COS di circa il 98%; l'exploit per Android, secondo l'autore, \u00e8 ancora in fase di sviluppo.<\/p>\n

<\/noindex> <\/p>\n

Sotto attacco ci sono i kernel basati sul branch 6.4 e successivi<\/strong>, a meno che non venga portata la correzione. I vecchi dispositivi Android con kernel 6.1, inclusi Pixel 8 e modelli simili, sono considerati dall'autore inattaccabili<\/a>. Resta agli utenti e agli amministratori l'unica opzione normativa di protezione: installare l'aggiornamento del kernel dal proprio distributore o venditore del dispositivo.<\/p>\n

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Fonte: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

1 \u0412 \u044f\u0434\u0440\u0435 Linux \u0440\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c Bad Epoll, \u0437\u0430\u0440\u0435\u0433\u0438\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u043a\u0430\u043a CVE-2026-46242. \u041e\u043d\u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043e\u0431\u044b\u0447\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 \u0431\u0435\u0437 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u0430\u0432 \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0434\u043e root. \u041f\u043e \u0434\u0430\u043d\u043d\u044b\u043c \u0430\u0432\u0442\u043e\u0440\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0414\u0436\u044d\u0451\u043d\u0430 \u0427\u043e\u043d\u0430, \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e Linux-\u0434\u0435\u0441\u043a\u0442\u043e\u043f\u044b \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u044b, \u043d\u043e \u0438 \u0447\u0430\u0441\u0442\u044c Android-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u043d\u0430 \u043d\u043e\u0432\u044b\u0445 \u0432\u0435\u0440\u0441\u0438\u044f\u0445 \u044f\u0434\u0440\u0430 \u2014 \u044d\u0442\u043e \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e \u043f\u043e\u0434\u0447\u0451\u0440\u043a\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0432 \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0438 Bad Epoll. \u041e\u0448\u0438\u0431\u043a\u0430 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-182539","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47Bad Epoll: individuata una vulnerabilit\u00e0 in Linux e Android per ottenere accesso root | ProHoster","description":"1 \u00c8 stata scoperta una vulnerabilit\u00e0 nel kernel Linux nota come Bad Epoll, registrata come CVE-2026-46242. Permette a un comune utente locale senza privilegi speciali di elevare le proprie autorizzazioni a root. Secondo l'autore della ricerca, Jayden Chong, il problema colpisce non solo desktop e server Linux, ma anche alcuni dispositivi Android con nuove versioni del kernel \u2014 questo \u00e8 sottolineato nell'elenco delle vulnerabilit\u00e0 di Bad Epoll. L'errore si trova in","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa","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\udd47Bad Epoll: \u0432 Linux \u0438 Android \u043d\u0430\u0448\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0434\u043b\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f root-\u0434\u043e\u0441\u0442\u0443\u043f\u0430 | ProHoster","og:description":"1 \u0412 \u044f\u0434\u0440\u0435 Linux \u0440\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c Bad Epoll, \u0437\u0430\u0440\u0435\u0433\u0438\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u043a\u0430\u043a CVE-2026-46242. \u041e\u043d\u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043e\u0431\u044b\u0447\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 \u0431\u0435\u0437 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u0430\u0432 \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0434\u043e root. \u041f\u043e \u0434\u0430\u043d\u043d\u044b\u043c \u0430\u0432\u0442\u043e\u0440\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0414\u0436\u044d\u0451\u043d\u0430 \u0427\u043e\u043d\u0430, \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e Linux-\u0434\u0435\u0441\u043a\u0442\u043e\u043f\u044b \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u044b, \u043d\u043e \u0438 \u0447\u0430\u0441\u0442\u044c Android-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u043d\u0430 \u043d\u043e\u0432\u044b\u0445 \u0432\u0435\u0440\u0441\u0438\u044f\u0445 \u044f\u0434\u0440\u0430 \u2014 \u044d\u0442\u043e \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e \u043f\u043e\u0434\u0447\u0451\u0440\u043a\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0432 \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0438 Bad Epoll. \u041e\u0448\u0438\u0431\u043a\u0430 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432","og:url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa","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":"2026-07-08T08:54:16+00:00","article:modified_time":"2026-07-08T08:54:16+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts\/182539","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/comments?post=182539"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts\/182539\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/media?parent=182539"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/categories?post=182539"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/tags?post=182539"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}