{"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\/sl\/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 jezgru.","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>, poznat kao <strong>DirtyCBC<\/strong>, koja omogu\u0107ava lokalnom nepovoljnom korisniku da dobije root prava na nekim Linux sistemima. Problem se nalazi u kodu <strong>rxgk<\/strong> pod-sistema <strong>RxRPC<\/strong> i povezan je s upisom u page cache usled nedostatka provere copy-on-write u funkciji rxgk_decrypt_skb(). O objavljivanju PoC 18. maja 2026. godine izvestio je portal BleepingComputer; sam PoC je postavljen u <a rel=\"nofollow\" href=\"https:\/\/github.com\/v12-security\/pocs\/tree\/main\/dirtydecrypt\">repozitorijumu 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 Linux jezgra<\/a> iznad UDP-a, koji pru\u017ea pouzdan transport za daljinske operacije. U dokumentaciji jezgra posebno je navedeno da <strong>AFS<\/strong> \u2014 Andrew File System \u2014 je primer aplikacije koja koristi RxRPC, a sam protokol podr\u017eava pregovore o bezbednosti veze. To\u010dno u ovu oblast spada RxGK, koji se koristi za za\u0161ti\u0107eni re\u017eim RxRPC\/AFS.<\/p>\n<p><\/noindex><\/p>\n<p>Prema opisima tima V12, DirtyDecrypt je jo\u0161 jedna varijanta ranjivosti klase <strong>CopyFail \/ Dirty Frag \/ Fragnesia<\/strong>. Sve se vrte oko sli\u010dne ideje: nepravilno rukovanje memorijom jezgra, page cache-om i baferima mo\u017ee omogu\u0107iti nepovoljnom lokalnom procesu da uti\u010de na podatke koji bi trebali biti nedostupni za upis. U slu\u010daju DirtyDecrypt radi se o \"rxgk pagecache write\" usled nedostatka COW za\u0161tite u rxgk_decrypt_skb().<\/p>\n<p>Tim V12 tvrdi da je otkrio i prijavio problem <strong>9. maja 2026. godine<\/strong>, ali prate\u0107i jezgra su odgovorili da je to duplikat ve\u0107 ispravljenog bug-a. Nakon toga su istra\u017eiva\u010di objavili PoC, motivi\u0161u\u0107i to \u010dinjenicom da je ispravka ve\u0107 u mainline jezgru.<\/p>\n<p>Situacija sa CVE-om nije sasvim jednostavna. BleepingComputer pi\u0161e da, u trenutku objave, ne postoji zaseban zvani\u010dni CVE za ime DirtyDecrypt, ali analiti\u010dar Will Dormann povezuje objavljene detalje tima V12 s <strong>CVE-2026-31635<\/strong>, ispravljenim krajem aprila. U bazi NVD, CVE-2026-31635 opisuje se kao gre\u0161ka u rxrpc: funkcija rxgk_verify_response() je nepravilno proveravala du\u017einu RESPONSE-authenticatora, zbog \u010dega je prevelik authenticator mogao da do\u0111e u rxgk_decrypt_skb() i izazove BUG_ON(len).<\/p>\n<p><noindex><\/p>\n<p>Dakle, javno objavljivanje povezuje 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 prvenstveno o gre\u0161ci u proveri du\u017eine u rxrpc, a ne direktno o aliasu DirtyDecrypt \/ DirtyCBC kao o zasebnoj stavci. Stoga je ispravnije re\u0107i: <em>DirtyDecrypt se verovatno podudara ili je blisko povezan s CVE-2026-31635<\/em>, ne pa trditi, da je to uradno ime CVE.<\/p>\n<p><\/noindex><\/p>\n<p>Za izkori\u0161\u010danje je jedro z vklopljeno mo\u017enostjo <strong>CONFIG_RXGK<\/strong>, ki omogo\u010da podporo za RxGK za AFS-odjemalca in omre\u017eni prenos. To znatno omejuje krog prizadetih sistemov: predvsem gre za distribucije, ki hitro sledijo upstream-jedru, vklju\u010dno z <strong>Fedora<\/strong>, <strong>Arch Linux<\/strong> in <strong>openSUSE Tumbleweed<\/strong>. Pri tem BleepingComputer poudarja, da je objavljen V12 PoC testiran le na Fedori in mainline jedru.<\/p>\n<p><noindex><\/p>\n<p>DirtyDecrypt se je pojavil v ozadju celotne serije podobnih Linux LPE ranljivosti. Prej so bile razkrite <strong>Copy Fail<\/strong> v algif_aead, <strong>Dirty Frag<\/strong> v omre\u017enih komponentah, nato <strong>Fragnesia<\/strong> v 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\/\">je opisal<\/a> Dirty Frag kot lokalno dvigovanje privilegijev preko komponent esp4, esp6 in rxrpc, kar omogo\u010da napadalcu, da po pridobitvi lokalnega dostopa dose\u017ee root in se utrdi v sistemu.<\/p>\n<p><\/noindex><\/p>\n<p>Prakti\u010dna nevarnost tak\u0161nih napak je, da se pogosto uporabljajo \u017ee po prvotnem vdoru: na primer, po kompromitaciji SSH ra\u010duna, web shella, ranljivega kontejnerja ali nizkopravnega servisnega uporabnika. Z dostopom do root lahko napadalec izklopi za\u0161\u010ditna sredstva, bere skrivnosti, spreminja dnevnike, postavi vzpostavitev trdnosti (persistence) in napreduje naprej po infrastrukturi.<\/p>\n<p>Uporabnikom potencialno prizadetih rolling-release distribucij se priporo\u010da, da namestijo zadnje posodobitve jedra. Za sisteme, kjer takoj\u0161nja posodobitev ni mogo\u010da, se v objavah omenjajo za\u010dasne re\u0161itve, kot so onemogo\u010danje neuporabljenih rxrpc modulov in povezanih komponent, vendar tak\u0161na obhodna re\u0161itev lahko po\u0161koduje AFS in del delovnih scenarijev IPsec\/VPN, zato jih je treba uporabiti le po preverjanju vpliva na specifi\u010den sistem.<\/p>\n<p>Za ve\u010dino namiznih in stre\u017enih namestitev je tveganje verjetno ni\u017eje kot pri Copy Fail: DirtyDecrypt zahteva specifi\u010dno konfiguracijo jedra in lokalno izvajanje kode. Kljub temu pa za Fedoro, Arch Linux, openSUSE Tumbleweed in druge sisteme z hitrimi posodobitvami jedra te\u017eava zaslu\u017ei pozornost: to \u017ee ni teoreti\u010dno poro\u010dilo, temve\u010d ranljivost z objavljenim PoC in jasnim na\u010dinom za dvig privilegijev.<\/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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