{"id":170830,"date":"2026-05-16T18:24:39","date_gmt":"2026-05-16T16:24:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/model-ugroz-i-osobennosti-oczenki-uyazvimostej-v-yadre-linux"},"modified":"2026-05-16T18:24:39","modified_gmt":"2026-05-16T16:24:39","slug":"model-ugroz-i-osobennosti-oczenki-uyazvimostej-v-yadre-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/model-ugroz-i-osobennosti-oczenki-uyazvimostej-v-yadre-linux","title":{"rendered":"Modelo de amea\u00e7as e caracter\u00edsticas da avalia\u00e7\u00e3o de vulnerabilidades no kernel Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Linus Torvalds aceitou um documento que regula o processo de tratamento de erros relacionados \u00e0 seguran\u00e7a no n\u00facleo, que define o modelo de amea\u00e7as, esclarecendo quais erros no n\u00facleo s\u00e3o considerados vulnerabilidades, e discute as a\u00e7\u00f5es a serem tomadas em rela\u00e7\u00e3o aos erros identificados com a ajuda da IA. O documento foi preparado por Willy Tarreau, autor do HAProxy e desenvolvedor veterano do n\u00facleo Linux, respons\u00e1vel pela manuten\u00e7\u00e3o de v\u00e1rios ramos est\u00e1veis do n\u00facleo. As bases foram estabelecidas a partir de acordos alcan\u00e7ados durante a discuss\u00e3o de vulnerabilidades cr\u00edticas recentemente identificadas no n\u00facleo (1, 2, 3, 4), reveladas antes da publica\u00e7\u00e3o das corre\u00e7\u00f5es e para as quais, gra\u00e7as \u00e0 IA, foi poss\u00edvel criar exploits funcionais imediatamente.      <\/p>\n<p>A maioria dos erros relacionados \u00e0 seguran\u00e7a deve ser tratada publicamente, a fim de atrair a maior audi\u00eancia poss\u00edvel e encontrar a solu\u00e7\u00e3o otimizada. Apenas mensagens de urg\u00eancia sobre vulnerabilidades facilmente explor\u00e1veis, que representam uma amea\u00e7a para muitos usu\u00e1rios e permitem a obten\u00e7\u00e3o de privil\u00e9gios ou capacidades expandidas, s\u00e3o sugeridas para serem enviadas a uma lista de distribui\u00e7\u00e3o privada.     <\/p>\n<p>As vulnerabilidades identificadas por assistentes de IA devem ser discutidas publicamente, uma vez que tais problemas frequentemente s\u00e3o descobertos simultaneamente por v\u00e1rios pesquisadores. No entanto, n\u00e3o se deve revelar o exploit no relat\u00f3rio \u2014 basta mencionar que ele est\u00e1 dispon\u00edvel e entreg\u00e1-lo em particular em resposta a um pedido do respons\u00e1vel.    <\/p>\n<p>Regras para a transmiss\u00e3o de relat\u00f3rios gerados com a ajuda de assistentes de IA s\u00e3o descritas separadamente. Muitos relat\u00f3rios desse tipo s\u00e3o enviados e, gra\u00e7as a eles, \u00e9 poss\u00edvel identificar erros em partes do c\u00f3digo que n\u00e3o foram bem revisadas, mas os respons\u00e1veis frequentemente os ignoram devido \u00e0 baixa qualidade e imprecis\u00f5es. Os principais requisitos para os relat\u00f3rios gerados com assistentes de IA s\u00e3o:   <\/p>\n<ul>\n<li class=\"l\"> Breviedade, sem rodeios e com \u00eanfase na ess\u00eancia e detalhes importantes logo no in\u00edcio.\n<li class=\"l\"> Apenas texto puro sem tags Markdown ou decora\u00e7\u00e3o.\n<li class=\"l\"> Compreender o modelo de amea\u00e7as e indicar fatos verific\u00e1veis (por exemplo, \"o erro permite que qualquer usu\u00e1rio obtenha CAP_NET_ADMIN\"), e n\u00e3o especula\u00e7\u00f5es te\u00f3ricas sobre as consequ\u00eancias da vulnerabilidade.\n<li class=\"l\"> Antes de enviar o relat\u00f3rio, \u00e9 essencial testar cuidadosamente a funcionalidade do exploit gerado pelo AI e garantir que o problema possa ser reproduzido.\n<li class=\"l\"> Utilizando AI para desenvolver e testar corre\u00e7\u00f5es para o problema identificado.  <\/ul>\n<p>Estat\u00edsticas de acompanhamentos indicam que a maioria dos relat\u00f3rios de erros enviados como se fossem corre\u00e7\u00f5es de vulnerabilidades n\u00e3o s\u00e3o, e devem ser tratados como erros comuns. Para diferenciar vulnerabilidades de erros comuns, um modelo de amea\u00e7a foi descrito no n\u00facleo do Linux. Entre as possibilidades e garantias cuja viola\u00e7\u00e3o pode ser considerada uma vulnerabilidade:  <\/p>\n<ul>\n<li class=\"l\"> Isolamento em n\u00edvel de usu\u00e1rio: acesso a arquivos restrito ao propriet\u00e1rio, a mem\u00f3ria do processo n\u00e3o acess\u00edvel a outros usu\u00e1rios, ptrace proibido para processos de outros, e isolamento IPC e comunica\u00e7\u00f5es de rede.\n<li class=\"l\"> Prote\u00e7\u00e3o baseada em capacidades: sem CAP_SYS_ADMIN n\u00e3o \u00e9 poss\u00edvel alterar a configura\u00e7\u00e3o do n\u00facleo, a mem\u00f3ria, ou o estado do sistema; sem CAP_NET_ADMIN n\u00e3o \u00e9 permitido alterar configura\u00e7\u00f5es de rede ou interceptar tr\u00e1fego; sem CAP_SYS_PTRACE n\u00e3o \u00e9 poss\u00edvel monitorar processos de outros usu\u00e1rios.\n<li class=\"l\"> O namespace de identificadores de usu\u00e1rios (CONFIG_USER_NS) permite que usu\u00e1rios n\u00e3o privilegiados criem seus pr\u00f3prios ambientes isolados, que n\u00e3o podem impactar o espa\u00e7o de nome global, por exemplo, mudando a hora, carregando m\u00f3dulos ou montando dispositivos blocos.\n<li class=\"l\"> Interfaces de depura\u00e7\u00e3o (\/proc\/kmsg, perf, debugfs), atrav\u00e9s das quais \u00e9 poss\u00edvel acessar informa\u00e7\u00f5es confidenciais, est\u00e3o dispon\u00edveis apenas ap\u00f3s a concess\u00e3o expl\u00edcita de acesso pelo administrador.    <\/ul>\n<p>Capacidades que n\u00e3o s\u00e3o consideradas vulnerabilidades:  <\/p>\n<ul>\n<li class=\"l\"> Uso de vers\u00f5es desatualizadas do n\u00facleo.\n<li class=\"l\"> Compila\u00e7\u00e3o com op\u00e7\u00f5es para desenvolvedores ou que diminuem a seguran\u00e7a (por exemplo, CONFIG_NOMMU).\n<li class=\"l\"> Defini\u00e7\u00e3o de configura\u00e7\u00f5es sysctl inseguras, op\u00e7\u00f5es de linha de comando, permiss\u00f5es no sistema de arquivos, capacidades ou fornecimento de acesso a interfaces privilegiadas para usu\u00e1rios n\u00e3o privilegiados (por exemplo, acesso de grava\u00e7\u00e3o ao procfs e debugfs).\n<li class=\"l\"> Problemas em fun\u00e7\u00f5es destinadas apenas para desenvolvimento e depura\u00e7\u00e3o do n\u00facleo, como LOCKDEP, KASAN e FAULT_INJECTION, que n\u00e3o devem ser inclu\u00eddas em configura\u00e7\u00f5es de produ\u00e7\u00e3o.\n<li class=\"l\"> Problemas em drivers, m\u00f3dulos e subsystems que est\u00e3o na se\u00e7\u00e3o STAGING ou marcados como experimentais, inseguros ou n\u00e3o funcionais.\n<li class=\"l\"> Uso de m\u00f3dulos de kernel de terceiros ou forks n\u00e3o oficiais do kernel.\n<li class=\"l\"> Exig\u00eancia de privil\u00e9gios excessivos, como a necessidade de executar a\u00e7\u00f5es com direitos de root ou de um usu\u00e1rio com direitos de CAP_SYS_ADMIN, CAP_NET_ADMIN, CAP_SYS_RAWIO e CAP_SYS_MODULE.\n<li class=\"l\"> Ataques te\u00f3ricos que requerem condi\u00e7\u00f5es de laborat\u00f3rio, bilh\u00f5es de tentativas, emula\u00e7\u00e3o ou modifica\u00e7\u00e3o de hardware, custos desproporcionais e configura\u00e7\u00f5es irreais (por exemplo, sistemas com dezenas de milhares de n\u00facleos de CPU).\n<li class=\"l\"> Contornar mecanismos de prote\u00e7\u00e3o (por exemplo, ASLR) sem demonstra\u00e7\u00e3o de exploit. Aus\u00eancia de verifica\u00e7\u00f5es de argumentos e c\u00f3digos de erro retornados que n\u00e3o t\u00eam consequ\u00eancias claras.\n<li class=\"l\"> Vazamentos de informa\u00e7\u00f5es acidentais, fora do controle dos atacantes, como dados remanescentes em mensagens de erro e vazamentos de endere\u00e7os\/pontadores para a mem\u00f3ria do kernel sem uma possibilidade direta de explora\u00e7\u00e3o.\n<li class=\"l\"> Erros na montagem de imagens de disco corrompidas, se o driver n\u00e3o for declarado como apropriado para uso com m\u00eddias n\u00e3o confi\u00e1veis. Problemas com imagens de disco que s\u00e3o detectados e resolvidos atrav\u00e9s da execu\u00e7\u00e3o da ferramenta fsck.\n<li class=\"l\"> Ataques que requerem acesso f\u00edsico ao hardware, modifica\u00e7\u00e3o de hardware ou conex\u00e3o de dispositivos de hardware, como placas para ataque por DMA e analisadores l\u00f3gicos, se o sistema n\u00e3o estiver especificamente configurado para prote\u00e7\u00e3o contra tais ataques (IOMMU).\n<li class=\"l\"> Regress\u00f5es de funcionalidade e desempenho que podem ser corrigidas ajustando permiss\u00f5es e limites.    <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65461\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041b\u0438\u043d\u0443\u0441 \u0422\u043e\u0440\u0432\u0430\u043b\u044c\u0434\u0441 \u043f\u0440\u0438\u043d\u044f\u043b \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442, \u0440\u0435\u0433\u043b\u0430\u043c\u0435\u043d\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u0448\u0438\u0431\u043e\u043a, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0445 \u0441 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c\u044e, \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u044e\u0449\u0438\u0439 \u043c\u043e\u0434\u0435\u043b\u044c \u0443\u0433\u0440\u043e\u0437, \u043f\u043e\u044f\u0441\u043d\u044f\u044e\u0449\u0438\u0439, \u043a\u0430\u043a\u0438\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 \u0432 \u044f\u0434\u0440\u0435 \u0442\u0440\u0430\u043a\u0442\u0443\u044e\u0442\u0441\u044f \u043a\u0430\u043a \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u0438 \u0440\u0430\u0437\u0431\u0438\u0440\u0430\u044e\u0449\u0438\u0439 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0441 \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u043c\u0438 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 AI. \u0414\u043e\u043a\u0443\u043c\u0435\u043d\u0442 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d \u0412\u0438\u043b\u043b\u0438 \u0422\u0430\u0440\u0440\u043e (Willy Tarreau), \u0430\u0432\u0442\u043e\u0440\u043e\u043c HAProxy \u0438 \u0434\u0430\u0432\u043d\u0438\u043c \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u043c \u044f\u0434\u0440\u0430 Linux, \u043e\u0442\u0432\u0435\u0447\u0430\u0432\u0448\u0438\u043c \u0437\u0430 \u0441\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0435\u043d\u0438\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u0432\u0435\u0442\u043e\u043a \u044f\u0434\u0440\u0430. \u0412 [&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-170830","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041b\u0438\u043d\u0443\u0441 \u0422\u043e\u0440\u0432\u0430\u043b\u044c\u0434\u0441 \u043f\u0440\u0438\u043d\u044f\u043b \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442, \u0440\u0435\u0433\u043b\u0430\u043c\u0435\u043d\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u0448\u0438\u0431\u043e\u043a, 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