{"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\/ro\/blog\/news\/bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa","title":{"rendered":"Bad Epoll: \u00een Linux \u0219i Android a fost descoperit\u0103 o vulnerabilitate pentru ob\u021binerea accesului root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

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1 <\/p>\n

O vulnerabilitate a fost descoperit\u0103 \u00een nucleul Linux Bad Epoll<\/strong>, \u00eenregistrat\u0103 ca CVE-2026-46242<\/a>. Aceasta permite unui utilizator local obi\u0219nuit, f\u0103r\u0103 drepturi speciale, s\u0103 \u00ee\u0219i creasc\u0103 privilegiile la root. Potrivit autorului studiului, Jaeon Chong, problema afecteaz\u0103 nu doar desktop-urile \u0219i serverele Linux, ci \u0219i unele dispozitive Android cu noi versiuni de kernel \u2014 acest lucru este subliniat separat \u00een descrierea Bad Epoll<\/a>.<\/p>\n

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Eroarea se afl\u0103 \u00een subsistemul epoll<\/strong> \u2014 mecanismul standard Linux pentru urm\u0103rirea mai multor descri\u0219teri de fi\u0219iere, conexiuni de re\u021bea \u0219i evenimente de intrare\/ie\u0219ire. Aceste mecanisme sunt utilizate activ de servere, browsere \u0219i servicii de re\u021bea, prin urmare, pur \u0219i simplu dezactivarea epoll nu este posibil\u0103. \u00cen analiza tehnic\u0103<\/a> vulnerabilitatea este descris\u0103 ca o competi\u021bie care conduce la use-after-free<\/strong>: \u00een timpul \u00eenchiderii simultane a obiectelor epoll asociate, un fir elibereaz\u0103 structurile interne, \u00een timp ce altul continu\u0103 s\u0103 le acceseze.<\/p>\n

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Mai exact, problema apare \u00een situa\u021bia \u00een care un descriitor epoll monitorizeaz\u0103 un altul, iar ambele descriitoare sunt \u00eenchise \u00een paralel. Dup\u0103 apelul __ep_remove(), c\u00e2mpul file->f_ep este temporar setat pe zero, iar __fput() concurent poate decide c\u0103 o cur\u0103\u021bare suplimentar\u0103 nu mai este necesar\u0103. Ca urmare, obiectul struct eventpoll sau struct file asociat este eliberat prea devreme, dar codul continu\u0103 s\u0103 lucreze cu pointeri pe o memorie deja eliberat\u0103. Acesta este exact ceea ce ofer\u0103 atacatorului un primitiv pentru coruperea memoriei nucleului.<\/p>\n

<\/p>\n

Pentru atac nu sunt necesare capabilit\u0103\u021bi suplimentare \u0219i nu sunt necesare namespace-uri de utilizator \u2014 este suficient s\u0103 existe CONFIG_EPOLL, ceea ce face problema deosebit de nepl\u0103cut\u0103 pentru sistemele Linux obi\u0219nuite. Conform raportului ini\u021bial al cercet\u0103torului<\/a>, bugul a fost introdus \u00een kernel printr-un commit 58c9b016e128<\/a> \u00een 2023, iar corectat prin commit a6dc643c693<\/a>.<\/p>\n

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\u00cen ciuda unei feronii foarte \u00eenguste, cercet\u0103torul a preg\u0103tit un exploit func\u021bional pentru Google kernelCTF. \u00cen descrierea exploat\u0103rii<\/a> se arat\u0103 cum eroarea se transform\u0103 \u00eentr-o \u00eenregistrare de 8 byte \u00een structura eliberat\u0103, apoi \u00eentr-o scurgere de memorie a nucleului prin \/proc\/self\/fdinfo, interceptarea file->f_op->poll \u0219i un lan\u021b ROP pentru ob\u021binerea root-ului. Pentru \u021binta lts-6.12.67, fiabilitatea este declarat\u0103 a fi de aproximativ 99%, pentru COS \u2014 de aproximativ 98%; exploit-ul Android, conform autorului, este \u00eenc\u0103 \u00een lucru.<\/p>\n

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

Sub atac sunt nucleele bazate pe ramura 6.4 \u0219i mai recente<\/strong>, dac\u0103 patch-ul nu a fost aplicat. Dispozitivele Android mai vechi cu nucleele 6.1, inclusiv Pixel 8 \u0219i modele similare, autorul consider\u0103 c\u0103 sunt invulnerabile<\/a>. Utilizatorii \u0219i administratorii au o singur\u0103 variant\u0103 corect\u0103 de protec\u021bie - s\u0103 instaleze actualizarea kernel-ului de la distribu\u021bia sau furnizorul dispozitivului lor.<\/p>\n

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Sursa: 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-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\n","aioseo_head_json":{"title":"\ud83e\udd47Bad Epoll: o vulnerabilitate \u00een Linux \u0219i Android permite ob\u021binerea accesului root | ProHoster","description":"","canonical_url":"https:\/\/prohoster.info\/ro\/blog\/news\/bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"ro_RO","og:site_name":"ProHoster | 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