{"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\/hr\/blog\/news\/10-linux-kernel-vulnerabilities-and-4-in-freebsd-that-allow-root-access","title":{"rendered":"10 ranjivosti u Linux kernelu i 4 u FreeBSD-u koje omogu\u0107uju dobivanje root prava u sustavu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Otkrivena je serija ranjivosti u jezgru Linux i FreeBSD. Ranjivosti u Linuxu omogu\u0107uju daljinsko izvr\u0161avanje koda, podizanje privilegija u sustavu, izlazak iz kontejnera ili zaobila\u017eenje izolacije virtualnih strojeva. Ranjivosti u FreeBSD omogu\u0107uju daljinsko zaustavljanje rada jezgra, podizanje privilegija u sustavu i zaobila\u017eenje izolacije hipervizora Bhyve.<\/p>\n<p>Ranjivosti u jezgru Linux:<\/p>\n<ul>\n<li class=\"l\"> 5 ranjivosti otkrivenih od strane projekta Zero Day Initiative prije objave ispravaka zbog gre\u0161ke u slanju informacija na pogre\u0161nu mailing listu:\n<ul>\n<li class=\"l\"> ZDI-CAN-33549 \u2014 ranjivost u ksmbd modulu s implementacijom datoteka <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> temeljenom na SMB protokolu, koju je mogu\u0107e iskoristiti za daljinsko izvr\u0161avanje koda na razini jezgre. Problem je uzrokovan prelivanjem cijelog broja u funkciji mbdirect_connection_rdma_xmit(), \u0161to se manifestira ako je jezgra sastavljena s opcijama \u00abCONFIG_SMB_SERVER_SMBDIRECT=y\u00bb i \u00abCONFIG_RDMA_RXE=y\u00bb. Za uspje\u0161an napad, napada\u010d mora imati mogu\u0107nost pisanja u zajedni\u010dko pohranu koju pru\u017ea napadnuti <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hr\/server\/dts-prohoster\/\"   title=\"serverom\" data-wpil-keyword-link=\"linked\">serverom<\/a>, na kojoj tako\u0111er moraju biti kori\u0161tene tehnologije RDMA i SMB Direct. Dostupan je prototip exploit-a koji radi na Debianu 13.\n<li class=\"l\"> ZDI-CAN-33774 \u2014 stanje utrke u ksmbd jezgrenom modulu, \u0161to dovodi do pisanja 62 bajta podataka iz SMB2 zaglavlja u 40-bajtni bafer dodijeljen za SMB1 protokol. Ranjivost mo\u017ee dovesti do daljinskog izvr\u0161avanja koda uz pristup SMB pohrani koju obra\u0111uje ksmbd. Dostupan je prototip eksploita koji radi na Debian 13.\n<li class=\"l\"> ZDI-CAN-33367 \u2014 ranjivost u mre\u017enom stogu jezgre koja omogu\u0107ava lokalnom korisniku da dobije root privilegije u sustavu prepisivanjem podataka procesa u stranicnom predmemoriji, sli\u010dno ranjivostima Dirty Frag i Fragnesia. Ovaj put problem je uzrokovan gre\u0161kom u funkciji<br \/>\nskb_zerocopy(). Pripremljen je prototip exploit-a koji funkcionira u razli\u010ditim verzijama Ubuntua. Ispravka je dostupna u obliku patcheva. Od distribucija, do sada su jedino programeri Alma Linuksa formirali hitno a\u017euriranje paketa s jezgrom, u kojem su ispravili ovu ranjivost.<\/p>\n<li class=\"l\"> ZDI-CAN-34068 \u2014 prelivanje bafera u VMWGFX grafi\u010dkom upravlja\u010dkom programu, koji se koristi za implementaciju 3D ubrzavanja u VMware okru\u017eenjima. Problem omogu\u0107ava lokalnom korisniku da dobije root privilegije u sustavu, uz uvjet da ima pristup virtualnom GPU preko ure\u0111aja \/dri\/card*. Dostupan je prototip eksploita koji radi na Ubuntu 26.04.\n<li class=\"l\"> ZDI-CAN-34076 \u2014 ranjivost u nvmet (NVMe Target) upravlja\u010dkom programu koja dovodi do otkrivanja informacija o sadr\u017eaju jezgrine memorije.\n<\/ul>\n<li class=\"l\"> Otkriveni su podaci i objavljeni prototipovi eksploita za 5 ranjivosti u jezgri koje omogu\u0107avaju nepovla\u0161tenom korisniku da dobije root privilegije u sustavu i zaobi\u0111e izolaciju kontejnera. Skup ranjivosti dobio je kodno ime \u00abInfinity Core\u00bb. Problemi su ve\u0107 ispravljeni u aktualnim izdanjima jezgre.\n<ul>\n<li class=\"l\"> CVE-2026-98260 \u2014 pristup memoriji nakon njezina osloba\u0111anja zbog ponovnog kori\u0161tenja POSIX tajmerske strukture, \u010dija je memorija oslobo\u0111ena u glavnoj niti nakon neuspjeha tijekom izvr\u0161avanja exec() poziva, ali je referenca ostala u redu (timerqueue) u drugoj niti. Dostupan je prototip eksploita, \u010dije je djelovanje demonstrirano na Ubuntu 26.04 i na Androidu na pametnom telefonu Samsung Galaxy S26 Ultra.\n<li class=\"l\"> CVE-2026-98256 \u2014 pristup memoriji nakon njenog osloba\u0111anja zbog stanja trke izme\u0111u poziva exec() u sekundarnom threadu i \u010di\u0161\u0107enja reda signala (sigqueue) koji \u010dekaju obradu. Tijekom manipulacija s redom mo\u017ee do\u0107i do situacije u kojoj referenca na obrada\u010da signala ostane u redu nakon osloba\u0111anja povezane memorije, i zatim \u0107e biti kori\u0161tena tijekom obrade signala. Rad eksploita demonstriran je u Ubuntu 26.04.\n<li class=\"l\"> CVE-2026-89754 \u2014 prelivanje bafera u implementaciji sistemskog poziva mincore(), koje nastaje zbog stanja trke pri ponovnom pregledu tablica stranica memorije nakon izvr\u0161enja madvise(MADV_DONTNEED). Rad eksploita demonstriran je u Ubuntu 26.04.\n<li class=\"l\"> CVE-2026-80775 \u2014 pristup memoriji nakon njenog osloba\u0111anja u sistemskom pozivu prctl(), koji se doga\u0111a zbog nepravilnog pra\u0107enja brojila referenci za he\u0161irane futekse pri pojavi.<br \/>\nstanja trke izme\u0111u zadataka koji zajedni\u010dki koriste jednu mm_struct strukturu pri ugnije\u017edenom pozivu vfork(). Eksploitacija koja koristi ranjivost za prepisivanje \/usr\/bin\/passwd u stranici ke\u0161a demonstrirana je u Ubuntu 26.04.<\/p>\n<li class=\"l\"> CVE-2026-98385 \u2014 pristup memoriji nakon njenog osloba\u0111anja u obrada\u010du predmemorije planera zadataka, \u0161to se de\u0161ava zbog toga \u0161to planer a\u017eurira polja sa statistikom u strukturi mm_struct za zadatak nakon osloba\u0111anja povezane memorije u slu\u010daju izvr\u0161enja poziva exec() na drugom CPU jezgru. Ranljivost se javlja u jezgrama s uklju\u010denom opcijom CONFIG_SCHED_CACHE. Rad eksploita demonstriran je u.<br \/>\nArch Linux s kernelom 7.2.4.<\/p>\n<\/ul>\n<li class=\"l\"> Ranljivost Vghost (CVE-2026-74580) u podsistemu jezgra vhost, koja se koristi za ubrzanje operacija ulaza\/izlaza preko Virtio u sistemima virtualizacije. Ranljivost je uzrokovana nepravilnim radom s predmemorijom tablica prevo\u0111enja adresa ulaza-izlaza (IOTLB) i mo\u017ee se koristiti za pove\u0107anje privilegija u sistemu i za obila\u017eenje izolacije gostuju\u0107eg sistema. Tijekom ponovne konfiguracije adresa ili veli\u010dina redova (vring) putem poziva VHOST_SET_VRING_ADDR ili VHOST_SET_VRING_NUM, predmemorija vq-&gt;meta_iotlb[] nije bila o\u010di\u0161\u0107ena, \u0161to je dovelo do prevo\u0111enja novih adresa s ve\u0107 neva\u017ee\u0107im zapisima o mapiranju memorije.\n<p>Objavljen je prototip eksploita za dobivanje root prava, testiran na distribucijama Ubuntu 26.04, RHEL 9.8, Amazon Linux 2023.12.20260817, Azure Linux 3.0 i Oracle Linux 10.2.<br \/>\nMogu\u0107e je iskoristiti ranjivost za izvr\u0161avanje koda na razini jezgre host sustava kroz manipulacije pozivom VIRTIO_F_RING_RESET u gostuju\u0107em sustavu u virtualiziranim okru\u017eenjima s virtualnim IOMMU-om.<br \/>\nProblem se pojavljuje od jezgre Linux 4.11 i otklonjen je u verzijama 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, 6.18.45, 7.1.9 i 7.2. Kao zaobilazno rje\u0161enje za\u0161tite mo\u017ee se ograni\u010diti pristup ure\u0111ajima \/dev\/vhost-net, \/dev\/vhost-vsock, \/dev\/vhost-scsi i \/dev\/vhost-vdpa-*.<\/p>\n<\/ul>\n<p>Ranljivosti u FreeBSD (otklonjene u a\u017euriranjima 15.1-RELEASE-p5, 14.5-RELEASE-p2 i 14.4-RELEASE-p11):<\/p>\n<ul>\n<li class=\"l\"> CVE-2026-101308 \u2014 pristup memoriji nakon njenog osloba\u0111anja u drajveru zvuka, koji nastaje zbog stanja trke izme\u0111u operacije promjene veli\u010dine bafera i mapiranja memorije putem mmap. Ranljivost potencijalno omogu\u0107ava lokalnom korisniku s pristupom zvu\u010dnom ure\u0111aju da dobije root prava.\n<li class=\"l\"> CVE-2026-101309, CVE-2026-101310, CVE-2026-101311 \u2014 ranjivosti u komponentama hipervizora Bhyve, koje omogu\u0107uju izvr\u0161avanje koda na strani host okru\u017eenja putem manipulacija u gostuju\u0107em sustavu. Problemi su uzrokovani izlaskom izvan granica spremnika zbog stanja utrke u modelu kontrolera xHCI (USB 3), kao i nedostatkom provjera veli\u010dine zapisa u modelima ure\u0111aja HDA (High Definition Audio) i framebuffer.\n<li class=\"l\"> CVE-2026-101307 \u2014 cijeli broj preljeva u modulu tcp_rack s implementacijom algoritma za odre\u0111ivanje gubitka paketa RACK (Recent ACKnowledgment), \u0161to dovodi do alokacije premalog spremnika za prihva\u0107ene podatke. Ranjivost omogu\u0107uje prepisivanje do 512 KB u podru\u010dju izvan granica spremnika prilikom slanja velikog broja ACK paketa u uspostavljenom TCP vezi. Zapa\u017ea se da eksploatacija mo\u017ee dovesti do pada jezgre u stanje panike.\n<\/ul>\n<p>Izvor: <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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