{"id":182553,"date":"2026-07-08T22:53:54","date_gmt":"2026-07-08T20:53:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/novye-uyazvimosti-freebsd"},"modified":"2026-07-08T22:53:54","modified_gmt":"2026-07-08T20:53:54","slug":"novye-uyazvimosti-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/novye-uyazvimosti-freebsd","title":{"rendered":"Novas vulnerabilidades do FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex>          <a rel=\"nofollow\" id=\"memories_button\" href=\"#\" title=\"Monitorar\"><i class=\"icon-bell\"><\/i><\/a><br \/>2                            <\/p>\n<p>Em 30 de junho de 2026, foram publicadas notifica\u00e7\u00f5es de corre\u00e7\u00e3o para 13 novas vulnerabilidades no sistema operacional FreeBSD.<\/p>\n<ul>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:37.vm.asc\">CVE-2026-49418<\/a>. Um usu\u00e1rio com acesso a um dispositivo que possui uma interface memory-mapped pode provocar um double-free\/use-after-free no kernel. Isso pode levar a uma eleva\u00e7\u00e3o de privil\u00e9gios. <\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:38.jail.asc\">CVE-2026-49419<\/a>. (apenas FreeBSD 15+) Redu\u00e7\u00e3o dupla do refcount do jail atual ao tratar erro de acesso a outro jail por meio de um descritor de jail (introduzido no FreeBSD 15), resultando em uma libera\u00e7\u00e3o n\u00e3o planejada da estrutura de controle do jail e subsequentes use-after-free onde quer que ela seja utilizada. Teoricamente, isso pode levar a uma eleva\u00e7\u00e3o de privil\u00e9gios. <\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:39.execve.asc\">CVE-2026-49415<\/a>. Ao executar um programa setuid, os direitos de acesso \u00e0 sua mem\u00f3ria s\u00e3o configurados um pouco mais tarde do que a mem\u00f3ria \u00e9 inicializada, permitindo que, por um curto per\u00edodo de tempo, algu\u00e9m acesse e edite essa mem\u00f3ria sem ter os privil\u00e9gios necess\u00e1rios, atrav\u00e9s do procfs ou linprocfs. Na maioria dos sistemas, procfs, e ainda mais a libprocfs, n\u00e3o est\u00e3o montados, ent\u00e3o o problema provavelmente afeta poucas pessoas. <\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:40.zfs.asc\">CVE-2026-49429, CVE-2026-49430, CVE-2026-49431<\/a>. (apenas para sistemas com ZFS) Os dois primeiros erros est\u00e3o relacionados \u00e0 aloca\u00e7\u00e3o de mem\u00f3ria de tamanho incorreto: um buffer \u00e9 alocado com um tamanho passado como um n\u00famero de 32 bits, e depois dados do tamanho real s\u00e3o gravados nele, resultando em um estouro se o tamanho real do buffer era maior que 4GB. Ambos podem ser provocados apenas pelo root ou por um usu\u00e1rio com privil\u00e9gios explicitamente adicionados para opera\u00e7\u00f5es vulner\u00e1veis. O terceiro erro pode ser explorado por qualquer um, permitindo a qualquer pessoa anexar o flag &#171;$hasrecvd&#187; a um dataset usando ZFS_IOC_SET_PROP (o qu\u00e3o perigoso isso \u00e9, n\u00e3o est\u00e1 claro no an\u00fancio). <\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:41.libalias.asc\">CVE-2026-49420<\/a>. A falta de verifica\u00e7\u00e3o adequada do tamanho do pacote antes de grav\u00e1-lo em um buffer de tamanho fixo na pilha, no m\u00f3dulo libalias que suporta RTSP, leva \u00e0 possibilidade de o transbordamento da pilha ou do n\u00facleo (para ipfw nat) ou do processo natd (que geralmente \u00e9 executado como root) ser explorado remotamente e sem autoriza\u00e7\u00e3o. Pode potencialmente levar a RCE. A vulnerabilidade pode ser provocada por um host malicioso dentro da rede local por tr\u00e1s de NAT, implementado atrav\u00e9s do libalias, que envia pacotes RTSP maliciosos. Portanto, a vulnerabilidade n\u00e3o afeta hosts nos quais o NAT n\u00e3o est\u00e1 em execu\u00e7\u00e3o de alguma forma. Al\u00e9m disso: natd deixar\u00e1 de ser vulner\u00e1vel se a linha libalias_smedia.so for removida de \/etc\/libalias.conf e o natd for reiniciado, e o ipfw nat n\u00e3o ser\u00e1 vulner\u00e1vel sem o carregamento do m\u00f3dulo alias_smedia.ko (n\u00e3o est\u00e1 claro se ele pode ser carregado automaticamente). Al\u00e9m disso, o manipulador vulner\u00e1vel apenas monitora pacotes TCP\/UDP que est\u00e3o saindo e t\u00eam uma das portas 554 ou 7070 \u2014 se esses pacotes forem bloqueados antes de chegarem ao NAT, a vulnerabilidade tamb\u00e9m desaparecer\u00e1. <\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:42.unlinkat.asc\">CVE-2026-49421<\/a>. unlinkat() e funlinkat() n\u00e3o consideravam a flag AT_RESOLVE_BENEATH, que deveria proibir que, ao percorrer este caminho, se sa\u00edsse dos limites do diret\u00f3rio especificado pelo argumento dirfd. Assim, era permitido excluir arquivos fora do diret\u00f3rio quando o c\u00f3digo chamador desejava impor essa restri\u00e7\u00e3o. <\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:43.tcp.asc\">CVE-2026-49422<\/a>. Condi\u00e7\u00e3o de corrida no m\u00f3dulo tcp_rack.ko (por padr\u00e3o, ele n\u00e3o est\u00e1 carregado). Para cada socket TCP, \u00e9 poss\u00edvel escolher individualmente a pilha TCP pela qual ele funcionar\u00e1, inclusive alternando-as em tempo real. Se for feito assim: 1) em um socket com tcp_rack, chamamos setsockopt() espec\u00edfico do rack, 2) em outro thread, conseguimos rapidamente alternar a pilha TCP do rack para outra e voltar para o rack no momento certo, o manipulador rack setsockopt() funcionar\u00e1 com o antigo (antes da troca) endere\u00e7o da estrutura de estado do socket, o que leva a corrup\u00e7\u00e3o de mem\u00f3ria e poss\u00edvel eleva\u00e7\u00e3o de privil\u00e9gios. Apenas sistemas onde o tcp_rack.ko est\u00e1 claramente carregado s\u00e3o afetados, isso n\u00e3o \u00e9 o padr\u00e3o.<\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:44.posixshm.asc\">CVE-2026-49427, CVE-2026-49428<\/a>. As largepages POSIX (shm_create_largepage) n\u00e3o eram marcadas de forma adequada como utilizadas durante a aloca\u00e7\u00e3o, o que poderia levar \u00e0 sua libera\u00e7\u00e3o incorreta sob v\u00e1rias circunst\u00e2ncias (est\u00e3o mencionadas chamadas sendfile com a flag SF_NOCACHE, open com a flag O_TRUNC e fspacectl) e subsequente use-after-free com as consequ\u00eancias habituais.<\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:45.audit.asc\">CVE-2026-49426<\/a>. Logs de auditoria (4) incorretos sobre chamadas de sistema remotas via ptrace(PT_SC_REMOTE). Podem confundir sistemas de an\u00e1lise de situa\u00e7\u00f5es suspeitas, caso estejam em uso.<\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:46.ktls.asc\">CVE-2026-49423<\/a>. Poss\u00edvel kernel-panic ao receber dados via kTLS envolvendo registros TLS 1.2 CBC. Para evitar o problema, pode-se definir kern.ipc.tls.enable=0 ou kern.ipc.tls.cbc_enable=0.<\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:47.linux.asc\">CVE-2026-49424<\/a>. Vazamento de dados (104 bytes) da pilha do kernel ao chamar linux-compat waitid(), que esquece de zerar a parte n\u00e3o utilizada da estrutura siginfo_t do linux ao transferir dados dela para o FreeBSD. Em n\u00facleos GENERIC normais, o emulador linux est\u00e1 desativado por padr\u00e3o e \u00e9 ativado apenas com a carga manual do m\u00f3dulo.<\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:48.compat32.asc\">CVE-2026-49425<\/a>. Similar ao anterior, o kevent de 32 bits esquece de zerar a estrutura de 32 bits antes de transferir dados dela para a nativa de 64 bits, resultando em vazamento de dados da pilha. Por padr\u00e3o, a compatibilidade de 32 bits no kernel est\u00e1 habilitada (n\u00e3o como m\u00f3dulo).<\/li>\n<li> <a rel=\"nofollow\" href=\"https:\/\/www.freebsd.org\/security\/advisories\/FreeBSD-SA-26:49.iconv.asc\">CVE-2026-58081, CVE-2026-58082<\/a>. Vulnerabilidades no iconv. A primeira: muitos de seus m\u00f3dulos n\u00e3o verificam o tamanho do buffer de sa\u00edda fornecido pelo c\u00f3digo chamador antes de gravar o resultado nele (mencionados HZ, UTF-7, VIQR, ZW). A segunda: o m\u00f3dulo ISO-2022 utiliza um buffer de 6 bytes na pilha para opera\u00e7\u00f5es internas, mas pode gravar at\u00e9 10 bytes, corrompendo a pilha. Como resultado, executar iconv para convers\u00e3o para ou de uma das codifica\u00e7\u00f5es mencionadas com entradas n\u00e3o verificadas pode estar sujeito a estouros de buffer. <\/li>\n<\/ul>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/news\/security\/18335229\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>2 30 \u0438\u044e\u043d\u044f 2026 \u0433\u043e\u0434\u0430 \u0431\u044b\u043b\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u0443\u0432\u0435\u0434\u043e\u043c\u043b\u0435\u043d\u0438\u044f \u043e\u0431 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0438 13 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u041e\u0421 FreeBSD. CVE-2026-49418. \u041f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0441 \u0434\u043e\u0441\u0442\u0443\u043f\u043e\u043c \u043a \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0443, \u0438\u043c\u0435\u044e\u0449\u0435\u043c\u0443 memory-mapped \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441, \u043c\u043e\u0436\u0435\u0442 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c double-free\/use-after-free \u0432 \u044f\u0434\u0440\u0435. \u0412\u0435\u0440\u043e\u044f\u0442\u043d\u043e, \u044d\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u044e \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439. CVE-2026-49419. (\u0442\u043e\u043b\u044c\u043a\u043e FreeBSD 15+) \u0414\u0432\u043e\u0439\u043d\u043e\u0435 \u0443\u043c\u0435\u043d\u044c\u0448\u0435\u043d\u0438\u0435 refcount \u0442\u0435\u043a\u0443\u0449\u0435\u0433\u043e jail-\u0430 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u044f \u043a \u0434\u0440\u0443\u0433\u043e\u043c\u0443 jail \u043f\u043e jail [&hellip;]<\/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-182553","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=\"2 30 \u0438\u044e\u043d\u044f 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