{"id":183410,"date":"2026-09-20T10:54:15","date_gmt":"2026-09-20T08:54:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/opasnye-uyazvimosti-v-yadre-linux-kvm-exim-unbound-ghostscript-i-suricata"},"modified":"2026-09-20T10:54:15","modified_gmt":"2026-09-20T08:54:15","slug":"serious-vulnerabilities-in-the-linux-kernel-kvm-exim-unbound-ghostscript-and-suricata","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/serious-vulnerabilities-in-the-linux-kernel-kvm-exim-unbound-ghostscript-and-suricata","title":{"rendered":"Opasne ranjivosti u jezgru Linuxa, KVM-u, Eximu, Unboundu, Ghostscriptu i Suricati","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nekoliko nedavno otkrivenih opasnih ranjivosti koje omogu\u0107avaju dobivanje root pristupa u sustavu ili izvo\u0111enje daljinskog izvr\u0161avanja koda.  <\/p>\n<ul>\n<li class=\"l\"> Otkrivene su informacije o \u010detiri ranjivosti u Linux jezgru koje omogu\u0107avaju neprivilegiranom lokalnom korisniku da izvr\u0161i kod s root pravima. Problemi su ispravljeni u a\u017euriranjima Linux jezgra 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50 i 7.2.4. Za sve ranjivosti pripremljeni su eksploiti, \u010dija je funkcionalnost demonstrirana u Fedora 43\/44 i Ubuntu 24.04. Za iskori\u0161tavanje prva tri ranjivosti potrebna je mogu\u0107nost stvaranja prostora imenskih identifikatora korisnika (user namespace) ili posjedovanje prava CAP_NET_ADMIN, kao i uklju\u010divanje podr\u0161ke za podsustave u kojima se nalaze ranjivosti (AH6\/XFRM, TUN, PPPoE i SCTP).\n<ul>\n<li class=\"l\"> DirtyAH6 (CVE-2026-80844, eksploitat) \u2014 prelivanje bafera u obradi IPsec AH (Authentication Header), koje se odvija zbog nedostatka provjere navedenih vrijednosti u zaglavlju. Osim lokalne provedbe napada, ranjivost se teoretski mo\u017ee iskoristiti na daljinu pod specifi\u010dnim uvjetima.\n<li class=\"l\"> TUNderflow (CVE-2026-81000, eksploitat) \u2014 pisanje izvan dodijeljenog bafera tijekom obrade neispravno formatiranog TUN paketa.\n<li class=\"l\"> PPPoEject (CVE-2026-68121, eksploitat) \u2014 pristup ve\u0107 oslobo\u0111enoj memoriji u PPPoE upravlja\u010du.\n<li class=\"l\"> DiagSpill (CVE-2026-74469, eksploitat) \u2014 prelivanje bafera u sredstvima za dijagnostiku SCTP protokola. Osim lokalne provedbe napada, ranjivost se teoretski mo\u017ee iskoristiti na daljinu pod specifi\u010dnim uvjetima.     <\/ul>\n<li class=\"l\"> Ranjivost (CVE-2026-89775) u hipervizoru <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hr\/vps\/abuzoustojchivye-vps\/\" title=\"KVM\" data-wpil-keyword-link=\"linked\">KVM<\/a>, omogu\u0107uju\u0107i pristup host okru\u017eenju iz gostuju\u0107eg sustava. Ako neprivilegirani korisnici imaju pristup ure\u0111aju \/dev\/kvm (po defaultu u RHEL), ranjivost se tako\u0111er mo\u017ee koristiti za pove\u0107anje privilegija u sustavu. Problem se javlja samo na sustavima s ARM64 arhitekturom kada je omogu\u0107ena podr\u0161ka za ugnije\u017edenu virtualizaciju. Ranjivost je uzrokovana time \u0161to je postupak izra\u010duna veli\u010dine vra\u0107ao \"0\", podrazumijevaju\u0107i da je veli\u010dina nepoznata, a funkcija osloba\u0111anja stranica memorije obra\u0111ivala \"0\" kao stvarnu vrijednost i nije \u010di\u0161tila stranice memorije.\n<li class=\"l\"> U izdanju po\u0161tanske <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hr\/server\/dts-los-angeles\/\" title=\"poslu\u017eitelja\" data-wpil-keyword-link=\"linked\">poslu\u017eitelja<\/a> Exim 4.100.1 ispravljene su 4 ranjivosti: \u010ditanje podataka izvan granica bafera i kori\u0161tenje neinicijaliziranih podataka u implementaciji Proxy protokola; pristup memoriji nakon njezinog osloba\u0111anja u TLS-on-connect koriste\u0107i GnuTLS; umetanje poruke u tu\u0111i tok (SMTP smuggling).\n<li class=\"l\"> U paketu Ghostscript 10.08.0 ispravljena je ranjivost (CVE-2026-39919) uzrokovana prelje vanjem bafera u kodu za analizu JPEG 2000 formata kada su navedene neispravne vrijednosti poduzorkovanja. Problem mo\u017ee dovesti do izvr\u0161enja koda tijekom obrade posebno oblikovanih PDF datoteka s ugra\u0111enim JPEG 2000 slikama u Ghostscriptu. Opasnost ove ranjivosti dodatno poja\u010dava to \u0161to se Ghostscript poziva tijekom izrade sli\u010dica na radnoj povr\u0161ini, tijekom pozadinske indeksacije podataka i tijekom konverzije slika. Za uspje\u0161an napad u mnogim slu\u010dajevima dovoljno je jednostavno preuzeti datoteku s eksploitom ili pregledati direktorij s njom u Nautilusu. Ranjivosti u Ghostscriptu tako\u0111er se mogu iskoristiti preko obraditelja slika temeljenih na paketima ImageMagick i GraphicsMagick, proslijediv\u0161i im JPEG ili PNG datoteku u kojoj se umjesto slike nalazi PostScript kod (takva \u0107e datoteka biti obra\u0111ena u Ghostscriptu, budu\u0107i da se MIME tip prepoznaje prema sadr\u017eaju, a ne oslanjaju\u0107i se na ekstenziju). Problem je ispravljen u Ghostscript 10.08.0.\n<li class=\"l\"> U DNS poslu\u017eitelju Unbound 1.26.1 ispravljeno je 9 ranjivosti, me\u0111u kojima je problem CVE-2026-81642, \u0161to dovodi do preljevanja bafera tijekom obrade odre\u0111enih DNSKEY. Ranjivost se mo\u017ee iskoristiti za daljinsko izvr\u0161avanje koda na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hr\/server\/dts-dronten\/\" title=\"serveru\" data-wpil-keyword-link=\"linked\">serveru<\/a>. Tako\u0111er su ispravljeni: preljevanje bafera u kodu za rad s DNSSEC-om, o\u0161te\u0107enje podataka u memoriji u obradi CNAME-a, pozivanje na ve\u0107 oslobo\u0111enu memoriju u kodu DoQ i DoH.\n<li class=\"l\"> U sustavu za otkrivanje i sprje\u010davanje napada Suricata 8.0.7 ispravljeno je 67 ranjivosti, od kojih su dvije ozna\u010dene kao kriti\u010dne. Podaci o problemima jo\u0161 nisu otkriveni, ali sude\u0107i prema razini opasnosti, ranjivosti dopu\u0161taju daljinsko izvr\u0161avanje koda tijekom obrade posebno oblikovanog prometa.  <\/ul>\n<p>Izvor: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=66310\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043d\u0435\u0434\u0430\u0432\u043d\u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043e\u043f\u0430\u0441\u043d\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c root-\u0434\u043e\u0441\u0442\u0443\u043f \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438\u043b\u0438 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430. \u0420\u0430\u0441\u043a\u0440\u044b\u0442\u044b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u0447\u0435\u0442\u044b\u0440\u0451\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 \u044f\u0434\u0440\u0435 Linux, \u0434\u0430\u044e\u0449\u0438\u0445 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\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 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 \u044f\u0434\u0440\u0430 Linux 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50 \u0438 7.2.4. \u0414\u043b\u044f \u0432\u0441\u0435\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u044b \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u044b, \u0440\u0430\u0431\u043e\u0442\u0430 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0430 [&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-183410","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043d\u0435\u0434\u0430\u0432\u043d\u043e \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043e\u043f\u0430\u0441\u043d\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c root-\u0434\u043e\u0441\u0442\u0443\u043f \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 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