{"id":184020,"date":"2026-10-27T23:40:54","date_gmt":"2026-10-27T21:40:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/10-uyazvimostej-v-yadre-linux-i-4-vo-freebsd-pozvolyayushhie-poluchit-prava-root-v-sisteme"},"modified":"2026-10-27T23:40:59","modified_gmt":"2026-10-27T21:40:59","slug":"10-linux-kernel-vulnerabilities-and-4-in-freebsd-that-allow-root-access","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/10-linux-kernel-vulnerabilities-and-4-in-freebsd-that-allow-root-access","title":{"rendered":"10 vulnerabilidades no n\u00facleo do Linux e 4 no FreeBSD que permitem obter direitos de root no sistema","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Foi identificada uma s\u00e9rie de vulnerabilidades no kernel do Linux e do FreeBSD. As vulnerabilidades no Linux permitem a execu\u00e7\u00e3o remota de c\u00f3digo, a eleva\u00e7\u00e3o de privil\u00e9gios no sistema, a sa\u00edda de cont\u00eaineres ou a burla da isola\u00e7\u00e3o de m\u00e1quinas virtuais. As vulnerabilidades no FreeBSD permitem parar remotamente o funcionamento do kernel, elevar privil\u00e9gios no sistema e contornar a isola\u00e7\u00e3o do hipervisor Bhyve.<\/p>\n<p>Vulnerabilidades no kernel do Linux:<\/p>\n<ul>\n<li class=\"l\"> 5 vulnerabilidades reveladas pelo projeto Zero Day Initiative antes da publica\u00e7\u00e3o de corre\u00e7\u00f5es devido ao envio errado de informa\u00e7\u00f5es para a lista de distribui\u00e7\u00e3o:\n<ul>\n<li class=\"l\"> ZDI-CAN-33549 \u2014 vulnerabilidade no m\u00f3dulo ksmbd com implementa\u00e7\u00e3o de arquivos <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/dts-los-angeles\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\">servidor<\/a> baseada no protocolo SMB, que pode ser explorada para execu\u00e7\u00e3o remota de c\u00f3digo a n\u00edvel de kernel. O problema \u00e9 causado por um estouro de inteiro na fun\u00e7\u00e3o mbdirect_connection_rdma_xmit(), que se manifesta quando o kernel \u00e9 compilado com as op\u00e7\u00f5es \"CONFIG_SMB_SERVER_SMBDIRECT=y\" e \"CONFIG_RDMA_RXE=y\". Para um ataque bem-sucedido, o agressor deve ter a capacidade de grava\u00e7\u00e3o no armazenamento compartilhado fornecido pela v\u00edtima. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/dts-prohoster\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\">servidor<\/a>no qual tamb\u00e9m devem ser utilizadas tecnologias RDMA e SMB Direct. Um prot\u00f3tipo de exploit est\u00e1 dispon\u00edvel, funcionando no Debian 13.\n<li class=\"l\"> ZDI-CAN-33774 \u2014 condi\u00e7\u00e3o de corrida no m\u00f3dulo do kernel ksmbd, levando \u00e0 escrita de 62 bytes de dados no cabe\u00e7alho SMB2 em um buffer de 40 bytes alocado para o protocolo SMB1. A vulnerabilidade pode permitir execu\u00e7\u00e3o remota de c\u00f3digo com acesso ao armazenamento SMB processado pelo ksmbd. Um prot\u00f3tipo de exploit est\u00e1 dispon\u00edvel, funcionando no Debian 13.\n<li class=\"l\"> ZDI-CAN-33367 \u2014 vulnerabilidade na pilha de rede do kernel que permite a um usu\u00e1rio local obter privil\u00e9gios de root no sistema, reescrevendo dados de processos no cache de p\u00e1ginas, semelhante \u00e0s vulnerabilidades Dirty Frag e Fragnesia. Desta vez, o problema \u00e9 causado por um erro na fun\u00e7\u00e3o<br \/>\nskb_zerocopy(). Um prot\u00f3tipo de exploit foi preparado, funcionando em v\u00e1rias vers\u00f5es do Ubuntu. A corre\u00e7\u00e3o est\u00e1 dispon\u00edvel na forma de um patch. At\u00e9 agora, apenas os desenvolvedores do Alma Linux formaram uma atualiza\u00e7\u00e3o de pacote fora do cronograma com o kernel, onde corrigiram essa vulnerabilidade.<\/p>\n<li class=\"l\"> ZDI-CAN-34068 \u2014 estouro de buffer no driver gr\u00e1fico VMWGFX, utilizado para implementar acelera\u00e7\u00e3o 3D em ambientes VMware. O problema permite que um usu\u00e1rio local obtenha privil\u00e9gios de root no sistema, com acesso ao GPU virtual atrav\u00e9s do dispositivo \/dri\/card*. Um prot\u00f3tipo de exploit est\u00e1 dispon\u00edvel, funcionando no Ubuntu 26.04.\n<li class=\"l\"> ZDI-CAN-34076 \u2014 vulnerabilidade no driver nvmet (NVMe Target), resultando em vazamento de informa\u00e7\u00f5es sobre o conte\u00fado da mem\u00f3ria do kernel.\n<\/ul>\n<li class=\"l\"> Foram reveladas informa\u00e7\u00f5es e publicados prot\u00f3tipos de exploits para 5 vulnerabilidades no kernel, permitindo que um usu\u00e1rio n\u00e3o privilegiado obtenha privil\u00e9gios de root no sistema e contorne a isola\u00e7\u00e3o de containers. O conjunto de vulnerabilidades recebeu o codinome \"Infinity Core\". Os problemas j\u00e1 foram corrigidos em lan\u00e7amentos atuais do kernel.\n<ul>\n<li class=\"l\"> CVE-2026-98260 \u2014 acesso \u00e0 mem\u00f3ria ap\u00f3s sua libera\u00e7\u00e3o devido ao reuso da estrutura do temporizador POSIX, cuja mem\u00f3ria foi liberada no thread principal ap\u00f3s falha na execu\u00e7\u00e3o da chamada exec(), mas a refer\u00eancia permaneceu na fila (timerqueue) em outro thread. Um prot\u00f3tipo de exploit est\u00e1 dispon\u00edvel, cujo funcionamento foi demonstrado no Ubuntu 26.04 e em um Android no smartphone Samsung Galaxy S26 Ultra.\n<li class=\"l\"> CVE-2026-98256 \u2014 acesso \u00e0 mem\u00f3ria ap\u00f3s a sua libera\u00e7\u00e3o devido a uma condi\u00e7\u00e3o de corrida entre a chamada de exec() em uma thread secund\u00e1ria e a limpeza da fila de sinais (sigqueue) aguardando processamento. Durante a manipula\u00e7\u00e3o da fila, pode ocorrer uma situa\u00e7\u00e3o em que a refer\u00eancia ao manipulador de sinal permanece na fila ap\u00f3s a libera\u00e7\u00e3o da mem\u00f3ria associada a ele, e ent\u00e3o \u00e9 utilizada ao processar sinais. O funcionamento do exploit foi demonstrado no Ubuntu 26.04.\n<li class=\"l\"> CVE-2026-89754 \u2014 estouro de buffer na implementa\u00e7\u00e3o da chamada de sistema mincore(), causado por uma condi\u00e7\u00e3o de corrida ao percorrer novamente as tabelas de p\u00e1ginas de mem\u00f3ria ap\u00f3s a execu\u00e7\u00e3o de madvise(MADV_DONTNEED). O funcionamento do exploit foi demonstrado no Ubuntu 26.04.\n<li class=\"l\"> CVE-2026-80775 \u2014 acesso \u00e0 mem\u00f3ria ap\u00f3s a sua libera\u00e7\u00e3o na chamada de sistema prctl(), originado por um rastreamento incorreto dos contadores de refer\u00eancia para hashes de futexes ao ocorrer.<br \/>\numa condi\u00e7\u00e3o de corrida entre tarefas que compartilham uma estrutura mm_struct durante uma chamada aninhada de vfork(). O exploit que usa a vulnerabilidade para sobrescrever \/usr\/bin\/passwd na cache de p\u00e1ginas foi demonstrado no Ubuntu 26.04.<\/p>\n<li class=\"l\"> CVE-2026-98385 \u2014 acesso \u00e0 mem\u00f3ria ap\u00f3s a sua libera\u00e7\u00e3o no manipulador de cache do escalonador de tarefas, causado pelo fato de que o escalonador atualiza os campos de estat\u00edsticas na estrutura mm_struct para a tarefa ap\u00f3s a libera\u00e7\u00e3o da mem\u00f3ria associada a ela em caso de execu\u00e7\u00e3o da chamada de exec() em outro n\u00facleo da CPU. A vulnerabilidade se manifesta em n\u00facleos com a op\u00e7\u00e3o CONFIG_SCHED_CACHE ativada. O funcionamento do exploit foi demonstrado em.<br \/>\nArch Linux com n\u00facleo 7.2.4.<\/p>\n<\/ul>\n<li class=\"l\"> A vulnerabilidade Vghost (CVE-2026-74580) no subsistema do n\u00facleo vhost, utilizado para acelerar opera\u00e7\u00f5es de entrada\/sa\u00edda via Virtio em sistemas de virtualiza\u00e7\u00e3o. A vulnerabilidade \u00e9 causada por um funcionamento incorreto com o cache de tabelas de tradu\u00e7\u00e3o de endere\u00e7os de entrada\/sa\u00edda (IOTLB) e pode ser utilizada para elevar privil\u00e9gios no sistema e contornar a isolamento do sistema convidado. Durante a reconfigura\u00e7\u00e3o de endere\u00e7os ou tamanhos de filas (vring) atrav\u00e9s das chamadas VHOST_SET_VRING_ADDR ou VHOST_SET_VRING_NUM, o cache vq-&gt;meta_iotlb[] n\u00e3o foi limpo, levando \u00e0 tradu\u00e7\u00e3o de novos endere\u00e7os usando entradas de mapeamento de mem\u00f3ria j\u00e1 inv\u00e1lidas.\n<p>Um prot\u00f3tipo de exploit para obten\u00e7\u00e3o de privil\u00e9gios de root foi publicado, testado nas distribui\u00e7\u00f5es Ubuntu 26.04, RHEL 9.8, Amazon Linux 2023.12.20260817, Azure Linux 3.0 e Oracle Linux 10.2.<br \/>\n\u00c9 poss\u00edvel explorar a vulnerabilidade para executar c\u00f3digo no n\u00edvel do n\u00facleo do sistema host atrav\u00e9s de manipula\u00e7\u00f5es com a chamada VIRTIO_F_RING_RESET no sistema convidado em ambientes virtualizados com IOMMU virtual.<br \/>\nO problema se manifesta a partir do n\u00facleo Linux 4.11 e foi corrigido nas vers\u00f5es 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9 e 7.2. Como uma medida compensat\u00f3ria de prote\u00e7\u00e3o, pode-se restringir o acesso aos dispositivos \/dev\/vhost-net, \/dev\/vhost-vsock, \/dev\/vhost-scsi e \/dev\/vhost-vdpa*.<\/p>\n<\/ul>\n<p>Vulnerabilidades no FreeBSD (corrigidas nas atualiza\u00e7\u00f5es 15.1-RELEASE-p5, 14.5-RELEASE-p2 e 14.4-RELEASE-p11):<\/p>\n<ul>\n<li class=\"l\"> CVE-2026-101308 \u2014 acesso \u00e0 mem\u00f3ria ap\u00f3s a sua libera\u00e7\u00e3o no driver de som, originando-se de uma condi\u00e7\u00e3o de corrida entre a opera\u00e7\u00e3o de redimensionamento do buffer e o mapeamento de mem\u00f3ria via mmap. A vulnerabilidade potencialmente permite que um usu\u00e1rio local, com acesso ao dispositivo de som, obtenha privil\u00e9gios de root.\n<li class=\"l\"> CVE-2026-101309, CVE-2026-101310, CVE-2026-101311 \u2014 vulnerabilidades nos componentes do hipervisor Bhyve, que permitem, atrav\u00e9s de manipula\u00e7\u00f5es no sistema convidado, executar c\u00f3digo no ambiente do host. Os problemas s\u00e3o causados por estouro de buffer devido a uma condi\u00e7\u00e3o de corrida no modelo do controlador xHCI (USB 3), bem como pela aus\u00eancia de verifica\u00e7\u00f5es de tamanho nos registros nos modelos de dispositivos HDA (High Definition Audio) e framebuffer.\n<li class=\"l\"> CVE-2026-101307 \u2014 estouro inteiro no m\u00f3dulo tcp_rack com a implementa\u00e7\u00e3o do algoritmo de detec\u00e7\u00e3o de perda de pacotes RACK (Recent ACKnowledgment), resultando na aloca\u00e7\u00e3o de um buffer muito pequeno para armazenar todos os dados recebidos. A vulnerabilidade permite sobrescrever at\u00e9 512 KB em \u00e1reas fora do buffer ao enviar um grande n\u00famero de pacotes ACK em uma conex\u00e3o TCP estabelecida. Observa-se que a explora\u00e7\u00e3o pode levar o kernel a um estado de panic.\n<\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=66542\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0441\u0435\u0440\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux \u0438 FreeBSD. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 Linux \u0434\u0430\u044e\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434, \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0432\u044b\u0439\u0442\u0438 \u0438\u0437 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432 \u0438\u043b\u0438 \u043e\u0431\u043e\u0439\u0442\u0438 \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u044e \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u0448\u0438\u043d. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432\u043e FreeBSD \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u043e\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u0443 \u044f\u0434\u0440\u0430, \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438 \u043e\u0431\u043e\u0439\u0442\u0438 \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u044e \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 Bhyve. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u044f\u0434\u0440\u0435 Linux: 5 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0440\u0430\u0441\u043a\u0440\u044b\u0442\u044b\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-184020","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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As vulnerabilidades no Linux permitem que c\u00f3digo seja executado remotamente, elevando suas privil\u00e9gios no sistema, escapando de cont\u00eaineres ou contornando o isolamento de m\u00e1quinas virtuais.","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/10-linux-kernel-vulnerabilities-and-4-in-freebsd-that-allow-root-access","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pt_PT","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\udd4710 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux \u0438 4 \u0432\u043e FreeBSD, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 | ProHoster","og:description":"\u0412\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0441\u0435\u0440\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux \u0438 FreeBSD. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 Linux \u0434\u0430\u044e\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434, \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0432\u044b\u0439\u0442\u0438 \u0438\u0437 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432 \u0438\u043b\u0438 \u043e\u0431\u043e\u0439\u0442\u0438 \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u044e \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u0448\u0438\u043d.","og:url":"https:\/\/prohoster.info\/pt\/blog\/news\/10-linux-kernel-vulnerabilities-and-4-in-freebsd-that-allow-root-access","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":"2026-10-27T21:40:54+00:00","article:modified_time":"2026-10-27T21:40:59+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\/pt\/wp-json\/wp\/v2\/posts\/184020","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/comments?post=184020"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/184020\/revisions"}],"predecessor-version":[{"id":184021,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/184020\/revisions\/184021"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/media?parent=184020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/categories?post=184020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/tags?post=184020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}