{"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\/et\/blog\/news\/opublikovan-poc-dlya-dirtydecrypt-novoj-lpe-uyazvimosti-v-yadre-linux","title":{"rendered":"Avaldatud PoC DirtyDecrypti \u2014 uue LPE-haavatavuse kohta Linuxi tuumas","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex>      <noindex><\/p>\n<p>Avaldatud t\u00f5estuskontseptsioon haavatavuse kohta <strong>DirtyDecrypt<\/strong>\u201eThe Rock\u201c <strong>DirtyCBC<\/strong>, mis v\u00f5imaldab kohalikul privileegita kasutajal saada root \u00f5igused m\u00f5nedes Linuxi s\u00fcsteemides. Probleem on koodis <strong>rxgk<\/strong> alams\u00fcsteemi <strong>RxRPC<\/strong> ja see on seotud kirjutamisega page cache'i, kuna puudu on copy-on-write kontroll funktsioonis rxgk_decrypt_skb(). PoC avaldamisest teatas 18. mai 2026 v\u00e4ljaanne BleepingComputer; ise PoC on paigutatud <a rel=\"nofollow\" href=\"https:\/\/github.com\/v12-security\/pocs\/tree\/main\/dirtydecrypt\">V12 meeskonna hoidlas<\/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 on Linuxi tuuma v\u00f5rguprotokoll<\/a> UDP peal, mis pakub usaldusv\u00e4\u00e4rset transporti kaugtegevuste jaoks. Tuuma dokumentatsioonis on eraldi mainitud, et <strong>AFS<\/strong> \u2014 Andrew File System \u2014 on n\u00e4ide rakendusest, mis kasutab RxRPC-d, ning protokoll toetab \u00fchenduse turvalisuse l\u00e4bir\u00e4\u00e4kimisi. Just selle ala juurde kuulub RxGK, mida kasutatakse RxRPC\/AFS turvalise re\u017eiimi jaoks.<\/p>\n<p><\/noindex><\/p>\n<p>V12 kirjelduse kohaselt on DirtyDecrypt veel \u00fcks n\u00e4ide haavatavustest klassist <strong>CopyFail \/ Dirty Frag \/ Fragnesia<\/strong>. K\u00f5ik need p\u00f6\u00f6rlevad sarnase idee \u00fcmber: tuuma m\u00e4lu, page cache'i ja puhvers\u00fcsteemide vale k\u00e4sitlemine v\u00f5ib v\u00f5imaldada privileegita kohalikul protsessil m\u00f5jutada andmeid, mis peaksid olema kirjutamiseks k\u00e4ttesaamatud. DirtyDecrypt'i puhul on tegu \"rxgk pagecache write\" probleemiga, kuna rxgk_decrypt_skb() funktsioonis puudub COW kaitse.<\/p>\n<p>V12 meeskond v\u00e4idab, et avastas ja teatas probleemist <strong>9. mai 2026<\/strong>, kuid tuuma hooldajad vastasid, et see on duplikaat juba parandatud veast. P\u00e4rast seda avaldasid teadlased PoC, v\u00e4ites, et parandamine on juba mainline- tuumas.<\/p>\n<p>CVE olukord ei tundu kuigi selge. BleepingComputer kirjutab, et eraldi ametlikku CVE-d nimega DirtyDecrypt hetkel ei ole, kuid anal\u00fc\u00fctik Will Dormann seob avaldatud V12 \u00fcksikasjad <strong>CVE-2026-31635<\/strong>, mis parandati aprilli l\u00f5pus. NVD andmebaasis on CVE-2026-31635 kirjeldatud kui viga rxrpc: funktsioon rxgk_verify_response() ei kontrollinud korrektselt RESPONSE autentifikaatori pikkust, mis v\u00f5imaldas liiga suure autentifikaatori j\u00f5uda rxgk_decrypt_skb() ja p\u00f5hjustada koodi BUG_ON(len).<\/p>\n<p><noindex><\/p>\n<p>Seega seovad avalikud publikatsioonid DirtyDecrypt'i <strong><a rel=\"nofollow\" href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-31635\">CVE-2026-31635<\/a><\/strong>, kuid CVE ametlik kirjeldus NVD-s tundub hetkel kitsam ja r\u00e4\u00e4gib peamiselt rxrpc pikkuse kontrollimise veast, mitte otse aliasist DirtyDecrypt\/DirtyCBC kui eraldi kirjest. Seet\u00f5ttu on korrektsem kirjutada: <em>DirtyDecrypt on t\u00f5en\u00e4oliselt seotud v\u00f5i tihedalt seotud CVE-2026-31635<\/em>, mitte v\u00e4ita, et see on ametlik nimi CVE.<\/p>\n<p><\/noindex><\/p>\n<p>Eksploiteerimiseks on vajalik s\u00fcda, kus on aktiveeritud valik <strong>CONFIG_RXGK<\/strong>, mis v\u00f5imaldab RxGK toetust AFS-kliendile ja v\u00f5rgu transpordile. See kitsendab oluliselt m\u00f5jutatud s\u00fcsteemide hulka: eelk\u00f5ige r\u00e4\u00e4gime jaotustest, mis j\u00e4rgnevate upstream-kerede kiirelt j\u00e4rgivad, sealhulgas <strong>Fedora<\/strong>, <strong>Arch Linux<\/strong> ja <strong>openSUSE Tumbleweed<\/strong>. Samas r\u00f5hutab BleepingComputer, et avaldatud V12 PoC oli testitud ainult Fedora ja mainline-kernelil.<\/p>\n<p><noindex><\/p>\n<p>DirtyDecrypt ilmnes seoses terve seeria sarnaste Linux LPE-haavatavustega. Varasemaid on avalikustatud <strong>Kopeeri nurjumine<\/strong> algif_aeadis, <strong>Dirty Frag<\/strong> v\u00f5rgu komponentides ja seej\u00e4rel <strong>Fragnesia<\/strong> XFRM ESP-in-TCP-s. 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\/\">kirjeldas<\/a> Dirty Fragi kui kohaliku privileegide t\u00f5usu esp4, esp6 ja rxrpc komponentide kaudu, mis v\u00f5imaldab r\u00fcndajal, kes on saanud kohaliku ligip\u00e4\u00e4su, t\u00f5usta root-taseme ja kinnituda s\u00fcsteemi.<\/p>\n<p><\/noindex><\/p>\n<p>Sarnaste vigade praktiline oht on see, et neid kasutatakse sageli p\u00e4rast esialgset r\u00fcnnet: n\u00e4iteks p\u00e4rast SSH-konto, web shelli, haavatava konteineri v\u00f5i madala privileegiga teenusekasutaja kompromiteerimist. Saades root'i juurdep\u00e4\u00e4su, saab r\u00fcndaja kaitsemehhanisme keelata, saladusi lugeda, logisid muuta, p\u00fcsivust luua ning edasi liikuda infrastruktuuris.<\/p>\n<p>Potentsiaalselt m\u00f5jutatud rolling-release jaotuste kasutajatele soovitatakse installida viimased tuumauuendused. S\u00fcsteemide jaoks, kus kohene uuendamine ei ole v\u00f5imalik, mainitakse avaldustes ajutisi meetmeid, nagu mitteaktiivsete rxrpc-modulite ja seotud komponentide keeldumine, kuid sellised lahendused v\u00f5ivad rikkuda AFS-i ja osa IPsec\/VPN stsenaariume, seet\u00f5ttu tuleks neid rakendada ainult p\u00e4rast konkreetse s\u00fcsteemi m\u00f5ju kontrollimist.<\/p>\n<p>Enamikul lauaarvuti ja serveri installatsioonidest on risk t\u00f5en\u00e4oliselt madalam kui Kopeeri nurjumine: DirtyDecrypt n\u00f5uab konkreetse kernelikonfiguratsiooni ja kohalike koodide t\u00e4itmist. K\u00fcll aga on Fedora, Arch Linux, openSUSE Tumbleweed ja teiste kiire tuumauuendusega s\u00fcsteemide puhul probleem t\u00e4helepanu v\u00e4\u00e4rt: see ei ole enam teoreetiline raport, vaid haavatavus koos avaldatud PoC-ga ja arusaadava teega privileegide t\u00f5stmiseks.<\/p>\n<p>Allikas: <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 5.0.1.1 - 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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