{"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\/cs\/blog\/news\/opublikovan-poc-dlya-dirtydecrypt-novoj-lpe-uyazvimosti-v-yadre-linux","title":{"rendered":"Byl publikov\u00e1n PoC pro DirtyDecrypt \u2014 novou LPE zranitelnost v j\u00e1dru Linux.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex>      <noindex><\/p>\n<p>Byl zve\u0159ejn\u011bn proof-of-concept pro zranitelnost <strong>DirtyDecrypt<\/strong>, tak\u00e9 zn\u00e1mou jako <strong>DirtyCBC<\/strong>, umo\u017e\u0148uj\u00edc\u00ed m\u00edstn\u00edmu nep\u0159id\u011blen\u00e9mu u\u017eivateli z\u00edskat pr\u00e1va root na n\u011bkter\u00fdch syst\u00e9mech Linux. Probl\u00e9m je v k\u00f3du <strong>rxgk<\/strong> podsubsystemu <strong>RxRPC<\/strong> a souvis\u00ed s z\u00e1pisem do page cache kv\u016fli chyb\u011bj\u00edc\u00ed kontrole copy-on-write ve funkci rxgk_decrypt_skb(). O zve\u0159ejn\u011bn\u00ed PoC 18. kv\u011btna 2026 informovalo vyd\u00e1n\u00ed BleepingComputer; samotn\u00fd PoC je um\u00edst\u011bn v <a rel=\"nofollow\" href=\"https:\/\/github.com\/v12-security\/pocs\/tree\/main\/dirtydecrypt\">repozit\u00e1\u0159i t\u00fdmu 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 \u2014 to je s\u00ed\u0165ov\u00fd protokol j\u00e1dra Linuxu<\/a> na vrchu UDP, poskytuj\u00edc\u00ed spolehlivou dopravu pro vzd\u00e1len\u00e9 operace. V dokumentaci j\u00e1dra je v\u00fdslovn\u011b uvedeno, \u017ee <strong>AFS<\/strong> \u2014 Andrew File System \u2014 je p\u0159\u00edkladem aplikace, kter\u00e1 pou\u017e\u00edv\u00e1 RxRPC, a samotn\u00fd protokol podporuje vyjedn\u00e1v\u00e1n\u00ed o zabezpe\u010den\u00ed spojen\u00ed. To se t\u00fdk\u00e1 oblasti RxGK, pou\u017eit\u00e9 pro zabezpe\u010den\u00fd re\u017eim RxRPC\/AFS.<\/p>\n<p><\/noindex><\/p>\n<p>Podle popisu V12 je DirtyDecrypt dal\u0161\u00edm variantou zranitelnost\u00ed t\u0159\u00eddy <strong>CopyFail \/ Dirty Frag \/ Fragnesia<\/strong>. V\u0161echny se to\u010d\u00ed kolem podobn\u00e9 my\u0161lenky: nespr\u00e1vn\u00e9 zach\u00e1zen\u00ed s pam\u011bt\u00ed j\u00e1dra, page cache a buffery m\u016f\u017ee umo\u017enit nep\u0159id\u011blen\u00e9mu m\u00edstn\u00edmu procesu ovlivnit data, kter\u00e1 by m\u011bla b\u00fdt pro z\u00e1pis nedostupn\u00e1. V p\u0159\u00edpad\u011b DirtyDecrypt jde o \u201erxgk pagecache write\u201c kv\u016fli chyb\u011bj\u00edc\u00ed COW ochran\u011b v rxgk_decrypt_skb().<\/p>\n<p>T\u00fdm V12 tvrd\u00ed, \u017ee probl\u00e9m objevil a nahl\u00e1sil <strong>9. kv\u011btna 2026<\/strong>, ale p\u0159idru\u017een\u00e9 j\u00e1dra odpov\u011bd\u011bla, \u017ee se jedn\u00e1 o duplik\u00e1t ji\u017e opraven\u00e9 chyby. Pot\u00e9 v\u011bdci zve\u0159ejnili PoC, motivov\u00e1ni t\u00edm, \u017ee oprava je ji\u017e v mainline j\u00e1d\u0159e.<\/p>\n<p>Situace s CVE nen\u00ed zcela jasn\u00e1. BleepingComputer uv\u00e1d\u00ed, \u017ee mu neexistuje \u017e\u00e1dn\u00fd samostatn\u00fd ofici\u00e1ln\u00ed CVE pro n\u00e1zev DirtyDecrypt v dob\u011b zve\u0159ejn\u011bn\u00ed, ale analytik Will Dormann spojuje zve\u0159ejn\u011bn\u00e9 detaily V12 s <strong>CVE-2026-31635<\/strong>, opravenou koncem dubna. V datab\u00e1zi NVD je CVE-2026-31635 pops\u00e1na jako chyba v rxrpc: funkce rxgk_verify_response() nespr\u00e1vn\u011b kontrolovala d\u00e9lku RESPONSE autentiz\u00e1toru, co\u017e mohlo v\u00e9st k tomu, \u017ee p\u0159\u00edli\u0161 velk\u00fd autentiz\u00e1tor mohl proj\u00edt do rxgk_decrypt_skb() a vyvolat BUG_ON(len).<\/p>\n<p><noindex><\/p>\n<p>To znamen\u00e1, \u017ee ve\u0159ejn\u00e9 publikace spojuj\u00ed DirtyDecrypt s <strong><a rel=\"nofollow\" href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-31635\">CVE-2026-31635<\/a><\/strong>, ale form\u00e1ln\u00ed popis CVE v NVD zat\u00edm vypad\u00e1 u\u017e\u0161\u00ed a hovo\u0159\u00ed p\u0159edev\u0161\u00edm o chyb\u011b ov\u011b\u0159ov\u00e1n\u00ed d\u00e9lky v rxrpc, a ne p\u0159\u00edmo o aliasu DirtyDecrypt\/DirtyCBC jako o samostatn\u00e9m z\u00e1znamu. Proto je p\u0159esn\u011bj\u0161\u00ed \u0159\u00edci: <em>DirtyDecrypt pravd\u011bpodobn\u011b odpov\u00edd\u00e1 nebo je \u00fazce spojen s CVE-2026-31635<\/em>, a ne tvrdit, \u017ee je to ofici\u00e1ln\u00ed n\u00e1zev CVE.<\/p>\n<p><\/noindex><\/p>\n<p>Pro provozov\u00e1n\u00ed je vy\u017eadov\u00e1no j\u00e1dro s aktivovanou volbou <strong>CONFIG_RXGK<\/strong>, kter\u00e1 zahrnuje podporu RxGK pro AFS klienta a s\u00ed\u0165ov\u00fd transport. To v\u00fdrazn\u011b z\u00fa\u017euje okruh zasa\u017een\u00fdch syst\u00e9m\u016f: p\u0159edev\u0161\u00edm se jedn\u00e1 o distribuce, kter\u00e9 rychle n\u00e1sleduj\u00ed upstream j\u00e1dro, v\u010detn\u011b <strong>Fedora<\/strong>, <strong>Arch Linux<\/strong> a <strong>openSUSE Tumbleweed<\/strong>. P\u0159itom BleepingComputer zd\u016fraz\u0148uje, \u017ee publikovan\u00fd V12 PoC byl testov\u00e1n pouze na Fedo\u0159e a mainline j\u00e1d\u0159e.<\/p>\n<p><noindex><\/p>\n<p>DirtyDecrypt se objevila na pozad\u00ed cel\u00e9 s\u00e9rie podobn\u00fdch Linux LPE zranitelnost\u00ed. D\u0159\u00edve byly odhaleny <strong>Chyba kop\u00edrov\u00e1n\u00ed<\/strong> v algif_aead, <strong>Dirty Frag<\/strong> v s\u00ed\u0165ov\u00fdch komponentech, a pot\u00e9 <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\/\">popisovala<\/a> Dirty Frag jako lok\u00e1ln\u00ed zv\u00fd\u0161en\u00ed opr\u00e1vn\u011bn\u00ed prost\u0159ednictv\u00edm komponent esp4, esp6 a rxrpc, kter\u00e1 \u00fato\u010dn\u00edkovi umo\u017e\u0148uj\u00ed po z\u00edsk\u00e1n\u00ed lok\u00e1ln\u00edho p\u0159\u00edstupu pov\u00fd\u0161it se na root a upevnit se v syst\u00e9mu.<\/p>\n<p><\/noindex><\/p>\n<p>Praktick\u00e9 nebezpe\u010d\u00ed t\u011bchto chyb spo\u010d\u00edv\u00e1 v tom, \u017ee jsou \u010dasto zneu\u017e\u00edv\u00e1ny ji\u017e po prvotn\u00edm hackersk\u00e9m \u00fatoku: nap\u0159\u00edklad po kompromitaci SSH \u00fa\u010dtu, web shellu, zraniteln\u00e9ho kontejneru nebo m\u00e1lo privilegovan\u00e9ho servisn\u00edho u\u017eivatele. Z\u00edsk\u00e1n\u00edm rootu m\u016f\u017ee \u00fato\u010dn\u00edk vyp\u00ednat ochrann\u00e9 prost\u0159edky, \u010d\u00edst tajemstv\u00ed, m\u011bnit logy, rozv\u00edjet ochranu setrv\u00e1n\u00ed a posouvat se d\u00e1le v infrastruktu\u0159e.<\/p>\n<p>U\u017eivatel\u016fm potenci\u00e1ln\u011b zasa\u017een\u00fdch rolling-release distribuc\u00ed se doporu\u010duje nainstalovat posledn\u00ed aktualizace j\u00e1dra. Pro syst\u00e9my, kde nen\u00ed mo\u017en\u00e9 okam\u017eit\u00e9 aktualizov\u00e1n\u00ed, se v publikac\u00edch zmi\u0148uj\u00ed do\u010dasn\u00e1 opat\u0159en\u00ed, jako je deaktivace nepou\u017e\u00edvan\u00fdch rxrpc modul\u016f a souvisej\u00edc\u00edch komponent, av\u0161ak takov\u00e1 obch\u00e1zej\u00edc\u00ed \u0159e\u0161en\u00ed mohou naru\u0161it AFS a \u010d\u00e1st IPsec\/VPN sc\u00e9n\u00e1\u0159\u016f, a proto je nutn\u00e9 je aplikovat pouze po ov\u011b\u0159en\u00ed dopadu na konkr\u00e9tn\u00ed syst\u00e9m.<\/p>\n<p>Pro v\u011bt\u0161inu desktopov\u00fdch a serverov\u00fdch instalac\u00ed je riziko pravd\u011bpodobn\u011b ni\u017e\u0161\u00ed ne\u017e u Copy Fail: DirtyDecrypt vy\u017eaduje specifickou konfiguraci j\u00e1dra a m\u00edstn\u00ed vykon\u00e1v\u00e1n\u00ed k\u00f3du. Nicm\u00e9n\u011b pro Fedoru, Arch Linux, openSUSE Tumbleweed a dal\u0161\u00ed syst\u00e9my s rychl\u00fdm aktualizov\u00e1n\u00edm j\u00e1dra si probl\u00e9m zaslou\u017e\u00ed pozornost: to u\u017e nen\u00ed teoretick\u00e1 zpr\u00e1va, ale zranitelnost s publikovan\u00fdm PoC a jasnou cestou k z\u00edsk\u00e1n\u00ed vy\u0161\u0161\u00edch opr\u00e1vn\u011bn\u00ed.<\/p>\n<p>Zdroj: <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 5.0.3 - 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 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\/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-05-23T16:24:43+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-05-23T16:24:43+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Byl publikov\u00e1n PoC pro DirtyDecrypt \u2014 novou LPE zranitelnost v j\u00e1d\u0159e Linux | ProHoster","description":"Byl publikov\u00e1n proof-of-concept pro zranitelnost DirtyDecrypt, tak\u00e9 zn\u00e1mou jako DirtyCBC, kter\u00e1 umo\u017e\u0148uje lok\u00e1ln\u00edmu neopr\u00e1vn\u011bn\u00e9mu u\u017eivateli z\u00edskat pr\u00e1va.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/opublikovan-poc-dlya-dirtydecrypt-novoj-lpe-uyazvimosti-v-yadre-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d PoC \u0434\u043b\u044f DirtyDecrypt \u2014 \u043d\u043e\u0432\u043e\u0439 LPE-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u044f\u0434\u0440\u0435 Linux | ProHoster","og:description":"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d proof-of-concept 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