{"id":181690,"date":"2026-05-23T18:24:43","date_gmt":"2026-05-23T16:24:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/opublikovan-poc-dlya-dirtydecrypt-novoj-lpe-uyazvimosti-v-yadre-linux"},"modified":"2026-05-23T18:24:43","modified_gmt":"2026-05-23T16:24:43","slug":"opublikovan-poc-dlya-dirtydecrypt-novoj-lpe-uyazvimosti-v-yadre-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/opublikovan-poc-dlya-dirtydecrypt-novoj-lpe-uyazvimosti-v-yadre-linux","title":{"rendered":"Objavljen je PoC za DirtyDecrypt \u2014 novu LPE ranjivost u Linux kernelu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex>      <noindex><\/p>\n<p>Objavljen je proof-of-concept za ranjivost <strong>DirtyDecrypt<\/strong>, tako\u0111er poznat kao <strong>DirtyCBC<\/strong>, koji omogu\u0107uje lokalnom korisniku bez privilegija da dobije root prava na nekim Linux sustavima. Problem se nalazi u kodu <strong>rxgk<\/strong> pod sustavom <strong>RxRPC<\/strong> i povezan je s pisanjem u page cache zbog nedostatka provjere copy-on-write u funkciji rxgk_decrypt_skb(). O objavi PoC-a 18. svibnja 2026. godine izvijestio je BleepingComputer; sam PoC je objavljen u <a rel=\"nofollow\" href=\"https:\/\/github.com\/v12-security\/pocs\/tree\/main\/dirtydecrypt\">repozitoriju tima V12<\/a>.<\/p>\n<p><\/noindex><\/noindex><\/p>\n<p><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/docs.kernel.org\/networking\/rxrpc.html\">RxRPC je mre\u017eni protokol jezgre Linuxa<\/a> iznad UDP-a, osiguravaju\u0107i pouzdan transport za udaljene operacije. U dokumentaciji jezgre izri\u010dito se navodi da <strong>AFS<\/strong> \u2014 Andrew File System \u2014 je primjer aplikacije koja koristi RxRPC, a sam protokol podr\u017eava pregovore o sigurnosti veze. Ova se domena odnosi na RxGK, koji se koristi za za\u0161ti\u0107eni na\u010din rada RxRPC\/AFS.<\/p>\n<p><\/noindex><\/p>\n<p>Prema opisu V12, DirtyDecrypt je jo\u0161 jedna varijanta ranjivosti klase <strong>CopyFail \/ Dirty Frag \/ Fragnesia<\/strong>. Sve one vrte se oko sli\u010dne ideje: nepravilno rukovanje memorijom jezgre, page cache i baferima mo\u017ee omogu\u0107iti neprivilegiranom lokalnom procesu da utje\u010de na podatke koji bi trebali biti nedostupni za pisanje. U slu\u010daju DirtyDecrypt, rije\u010d je o \"rxgk pagecache write\" zbog nedostatka COW za\u0161tite u rxgk_decrypt_skb().<\/p>\n<p>Tim V12 tvrdi da je otkrio i prijavio problem <strong>9. svibnja 2026. godine<\/strong>, ali su odgovaraju\u0107i programeri jezgre odgovorili da je to duplikat ve\u0107 ispravljene gre\u0161ke. Nakon toga, istra\u017eiva\u010di su objavili PoC, motiviraju\u0107i to time da ispravak ve\u0107 postoji u mainline kernelu.<\/p>\n<p>Situacija s CVE-om izgleda nije posve jednostavna. BleepingComputer izvje\u0161tava da za ime DirtyDecrypt ne postoji zaseban slu\u017ebeni CVE u trenutku objave, ali analiti\u010dar Will Dormann povezuje objavljene detalje V12 s <strong>CVE-2026-31635<\/strong>, ispravljenom krajem travnja. U bazi NVD, CVE-2026-31635 opisuje se kao gre\u0161ka u rxrpc: funkcija rxgk_verify_response() nije pravilno provjeravala duljinu RESPONSE autentifikatora, zbog \u010dega je preduga\u010dak autentifikator mogao u\u0107i u rxgk_decrypt_skb() i izazvati kod do BUG_ON(len).<\/p>\n<p><noindex><\/p>\n<p>To jest, javne publikacije povezuju DirtyDecrypt s <strong><a rel=\"nofollow\" href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-31635\">CVE-2026-31635<\/a><\/strong>, ali formalni opis CVE u NVD za sada izgleda u\u017ei i govori prije svega o gre\u0161ci provjere duljine u rxrpc, a ne izravno o aliasu DirtyDecrypt\/DirtyCBC kao odvojenoj stavci. Stoga je ispravnije re\u0107i: <em>DirtyDecrypt vjerojatno odgovara ili je blisko povezan s CVE-2026-31635<\/em>, a ne tvrditi da je to slu\u017ebeni naziv CVE.<\/p>\n<p><\/noindex><\/p>\n<p>Za iskori\u0161tavanje je potrebno jezgro s uklju\u010denom opcijom <strong>CONFIG_RXGK<\/strong>, koja omogu\u0107uje podr\u0161ku RxGK za AFS klijenta i mre\u017eni transport. To zna\u010dajno su\u017eava krug pogo\u0111enih sustava: prvenstveno se radi o distribucijama koje brzo prate upstream jezgro, uklju\u010duju\u0107i <strong>Fedora<\/strong>, <strong>Arch Linux<\/strong> i <strong>openSUSE Tumbleweed<\/strong>. Pritom BleepingComputer nagla\u0161ava da je objavljeni V12 PoC testiran samo na Fedori i mainline jezgru.<\/p>\n<p><noindex><\/p>\n<p>DirtyDecrypt se pojavio na pozadini cijelog niza sli\u010dnih LPE ranjivosti u Linuxu. Ranije su objavljene <strong>Kopiranje nije uspjelo<\/strong> u algif_aead, <strong>Dirty Frag<\/strong> u mre\u017enim komponentama, a zatim <strong>Fragnesia<\/strong> u XFRM ESP-in-TCP. Microsoft <a rel=\"nofollow\" href=\"https:\/\/www.microsoft.com\/en-us\/security\/blog\/2026\/05\/08\/active-attack-dirty-frag-linux-vulnerability-expands-post-compromise-risk\/\">opisala<\/a> Dirty Frag kao lokalno pove\u0107anje privilegija preko komponenti esp4, esp6 i rxrpc, \u0161to omogu\u0107ava napada\u010du da, nakon \u0161to stekne lokalni pristup, postane root i u\u010dvrsti se u sustavu.<\/p>\n<p><\/noindex><\/p>\n<p>Prakti\u010dna opasnost takvih gre\u0161aka le\u017ei u tome \u0161to se \u010desto koriste nakon prvobitnog hakiranja: primjerice, nakon kompromitacije SSH ra\u010duna, web shelle, ranjive kontejnere ili nisko privilegiranog servisnog korisnika. Dobivanjem root privilegija, napada\u010d mo\u017ee onemogu\u0107iti za\u0161titne mjere, \u010ditati tajne, mijenjati dnevni\u010dke zapise, provoditi persistenciju i napredovati dalje kroz infrastrukturu.<\/p>\n<p>Korisnicima potencijalno pogo\u0111enih rolling-release distribucija preporu\u010duje se instalacija najnovijih a\u017euriranja jezgra. Za sustave gdje odmah a\u017euriranje nije mogu\u0107e, u publikacijama se spominju privremene mjere poput isklju\u010divanja neiskori\u0161tenih rxrpc modula i povezanih komponenti, no takva privremena rje\u0161enja mogu pokvariti AFS i dio IPsec\/VPN scenarija, stoga ih treba primjenjivati tek nakon provjere utjecaja na odre\u0111eni sustav.<\/p>\n<p>Za ve\u0107inu desktop i serverskih instalacija rizik je vjerojatno manji nego kod Copy Fail: DirtyDecrypt zahtijeva specifi\u010dnu konfiguraciju jezgra i lokalno izvr\u0161avanje koda. Ipak, za Fedoru, Arch Linux, openSUSE Tumbleweed i druge sustave s brzim a\u017euriranjem jezgra problem zaslu\u017euje pa\u017enju: ovo vi\u0161e nije teorijski izvje\u0161taj, ve\u0107 ranjivost s objavljenim PoC-om i jasnim putem do pove\u0107anja privilegija.<\/p>\n<p>Izvor: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/news\/security\/18296676\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d proof-of-concept \u0434\u043b\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 DirtyDecrypt, \u0442\u0430\u043a\u0436\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0439 \u043a\u0430\u043a DirtyCBC, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root \u043d\u0430 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 Linux. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 \u043a\u043e\u0434\u0435 rxgk \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b RxRPC \u0438 \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u0437\u0430\u043f\u0438\u0441\u044c\u044e \u0432 page cache \u0438\u0437-\u0437\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 copy-on-write \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 rxgk_decrypt_skb(). \u041e \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 PoC 18 \u043c\u0430\u044f 2026 \u0433\u043e\u0434\u0430 \u0441\u043e\u043e\u0431\u0449\u0438\u043b\u043e \u0438\u0437\u0434\u0430\u043d\u0438\u0435 BleepingComputer; \u0441\u0430\u043c PoC \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d \u0432 [&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-181690","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d proof-of-concept \u0434\u043b\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 DirtyDecrypt, 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