{"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\/pt\/blog\/news\/bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa","title":{"rendered":"Vulnerabilidade Bad Epoll: uma falha foi encontrada no Linux e Android que permite acesso root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

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1 <\/p>\n

Uma vulnerabilidade foi descoberta no n\u00facleo do Linux Bad Epoll<\/strong>, registrada como CVE-2026-46242<\/a>. Ela permite que um usu\u00e1rio local comum, sem direitos especiais, eleve suas permiss\u00f5es a root. Segundo o autor da pesquisa, Jaeon Chong, o problema afeta n\u00e3o apenas desktops e servidores Linux, mas tamb\u00e9m parte dos dispositivos Android em novas vers\u00f5es do n\u00facleo \u2014 isso \u00e9 destacado separadamente na descri\u00e7\u00e3o do Bad Epoll<\/a>.<\/p>\n

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O erro est\u00e1 na subsistema epoll<\/strong> \u2014 um mecanismo padr\u00e3o do Linux para monitorar v\u00e1rios descritores de arquivo, conex\u00f5es de rede e eventos de entrada e sa\u00edda. Esses mecanismos s\u00e3o amplamente utilizados por servidores, navegadores e servi\u00e7os de rede, portanto, n\u00e3o se pode simplesmente desativar o epoll. Na an\u00e1lise t\u00e9cnica<\/a> a vulnerabilidade \u00e9 descrita como uma condi\u00e7\u00e3o de corrida, levando a use-after-free<\/strong>: enquanto objetos epoll relacionados est\u00e3o sendo fechados simultaneamente, uma thread libera estruturas internas, enquanto a outra continua a acess\u00e1-las.<\/p>\n

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

Mais precisamente, o problema se manifesta quando um descritor epoll monitora outro, e ambos os descritores s\u00e3o fechados em paralelo. Ap\u00f3s a chamada __ep_remove(), o campo file->f_ep \u00e9 temporariamente zerado, e o __fput() concorrente pode decidir que a limpeza adicional n\u00e3o \u00e9 mais necess\u00e1ria. Como resultado, o objeto struct eventpoll ou o struct file associado \u00e9 liberado muito cedo, mas o c\u00f3digo continua a operar com ponteiros para a mem\u00f3ria j\u00e1 liberada. \u00c9 isso que fornece ao atacante um vetor para corromper a mem\u00f3ria do n\u00facleo.<\/p>\n

<\/p>\n

N\u00e3o s\u00e3o necess\u00e1rias capacidades adicionais e nem namespaces de usu\u00e1rio \u2014 basta que o CONFIG_EPOLL esteja ativo, tornando o problema especialmente inc\u00f4modo para sistemas Linux comuns. De acordo com o relat\u00f3rio inicial do pesquisador<\/a>, o bug foi introduzido no n\u00facleo com o commit 58c9b016e128<\/a> em 2023, e foi corrigido pelo commit a6dc643c693<\/a>.<\/p>\n

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

Apesar da janela de corrida ser muito estreita, o pesquisador preparou um exploit funcional para o Google kernelCTF. Na descri\u00e7\u00e3o do exploit<\/a> \u00e9 demonstrado como o erro se transforma em uma grava\u00e7\u00e3o de 8 bytes em uma estrutura liberada, depois em um vazamento de mem\u00f3ria do n\u00facleo atrav\u00e9s de \/proc\/self\/fdinfo, interceptando file->f_op->poll e uma cadeia ROP para obter root. Para a vers\u00e3o lts-6.12.67, a confiabilidade \u00e9 de cerca de 99%, para COS \u2014 cerca de 98%; o exploit para Android, segundo o autor, ainda est\u00e1 em desenvolvimento.<\/p>\n

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

As vers\u00f5es do n\u00facleo afetadas s\u00e3o aquelas baseadas na ramifica\u00e7\u00e3o 6.4 e mais recentes<\/strong>, a menos que a corre\u00e7\u00e3o tenha sido aplicada. Dispositivos Android mais antigos em n\u00facleos 6.1, incluindo o Pixel 8 e modelos semelhantes, est\u00e3o tamb\u00e9m em risco. considera-se invulner\u00e1vel<\/a>. A \u00fanica solu\u00e7\u00e3o normal restante para usu\u00e1rios e administradores \u00e9 instalar a atualiza\u00e7\u00e3o do kernel do seu distribui\u00e7\u00e3o ou fornecedor do 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-news"],"aioseo_notices":[],"aioseo_head":"\n\t\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: vulnerabilidade encontrada no Linux e Android para obter acesso root | ProHoster","description":"","canonical_url":"https:\/\/prohoster.info\/pt\/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":"pt_PT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c 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