{"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\/hu\/blog\/news\/opublikovan-poc-dlya-dirtydecrypt-novoj-lpe-uyazvimosti-v-yadre-linux","title":{"rendered":"Megjelent a PoC a DirtyDecrypt sz\u00e1m\u00e1ra - \u00faj LPE-sebezhet\u0151s\u00e9g a Linux kernelben.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex>      <noindex><\/p>\n<p>Megjelent a proof-of-concept a sebezhet\u0151s\u00e9ghez <strong>DirtyDecrypt<\/strong>, m\u00e1s n\u00e9ven <strong>DirtyCBC<\/strong>, amely lehet\u0151v\u00e9 teszi, hogy egy helyi, nem privilegiz\u00e1lt felhaszn\u00e1l\u00f3 root jogokat szerezzen n\u00e9h\u00e1ny Linux rendszeren. A probl\u00e9ma a k\u00f3dban tal\u00e1lhat\u00f3 <strong>rxgk<\/strong> alrendszerben <strong>RxRPC<\/strong> , \u00e9s a page cache-be t\u00f6rt\u00e9n\u0151 \u00edr\u00e1ssal f\u00fcgg \u00f6ssze, amely a copy-on-write ellen\u0151rz\u00e9s hi\u00e1nya miatt fordul el\u0151 az rxgk_decrypt_skb() funkci\u00f3ban. A PoC megjelen\u00e9s\u00e9r\u0151l 2026. m\u00e1jus 18-\u00e1n sz\u00e1molt be a BleepingComputer; a PoC maga a <a rel=\"nofollow\" href=\"https:\/\/github.com\/v12-security\/pocs\/tree\/main\/dirtydecrypt\">V12 csapat t\u00e1rol\u00f3j\u00e1ban tal\u00e1lhat\u00f3<\/a>.<\/p>\n<p><\/noindex><\/noindex><\/p>\n<p><noindex><\/p>\n<p><a rel=\"nofollow\" href=\"https:\/\/docs.kernel.org\/networking\/rxrpc.html\">Az RxRPC egy Linux kernel h\u00e1l\u00f3zati protokoll<\/a> UDP f\u00f6l\u00f6tt, amely megb\u00edzhat\u00f3 sz\u00e1ll\u00edt\u00e1st biztos\u00edt t\u00e1voli m\u0171veletekhez. A kernel dokument\u00e1ci\u00f3ban k\u00fcl\u00f6n hangs\u00falyozz\u00e1k, hogy <strong>AFS<\/strong> \u2014 Andrew File System \u2014 p\u00e9ld\u00e1ul az RxRPC-t haszn\u00e1l\u00f3 alkalmaz\u00e1s. Mag\u00e1nak a protokollnak a biztons\u00e1gi t\u00e1rgyal\u00e1sok t\u00e1mogat\u00e1sa is a feladata. Ezzel a ter\u00fclettel kapcsolatos az RxGK is, amelyet a RxRPC\/AFS v\u00e9dett m\u00f3dj\u00e1hoz haszn\u00e1lnak.<\/p>\n<p><\/noindex><\/p>\n<p>A V12 le\u00edr\u00e1sa szerint a DirtyDecrypt a sebezhet\u0151s\u00e9gek egy \u00fajabb vari\u00e1nsa <strong>CopyFail \/ Dirty Frag \/ Fragnesia<\/strong>. Mindegyik a hasonl\u00f3 \u00f6tlet k\u00f6r\u00fcl forog: a kernel mem\u00f3ri\u00e1val, a page cache-sel \u00e9s a pufferekkel val\u00f3 helytelen kezel\u00e9s lehet\u0151v\u00e9 teheti, hogy egy nem privilegiz\u00e1lt helyi folyamat befoly\u00e1solja azokat az adatokat, amelyekhez nem lenne szabad hozz\u00e1f\u00e9rnie. A DirtyDecrypt eset\u00e9ben a \"rxgk pagecache write\" probl\u00e9m\u00e1r\u00f3l van sz\u00f3, a COW-v\u00e9delem hi\u00e1nya miatt az rxgk_decrypt_skb() funkci\u00f3ban.<\/p>\n<p>A V12 csapat azt \u00e1ll\u00edtja, hogy m\u00e1jus 9-\u00e9n 2026-ban felfedezte \u00e9s jelentette a probl\u00e9m\u00e1t <strong>2026. m\u00e1jus 9-\u00e9n.<\/strong>, de a kernelfejleszt\u0151k azt v\u00e1laszolt\u00e1k, hogy ez m\u00e1r kijav\u00edtott hiba duplik\u00e1ci\u00f3ja. Ezt k\u00f6vet\u0151en a kutat\u00f3k publik\u00e1lt\u00e1k a PoC-t, azzal az indokl\u00e1ssal, hogy a jav\u00edt\u00e1s m\u00e1r a mainline kernelben tal\u00e1lhat\u00f3.<\/p>\n<p>A CVE helyzete nem teljesen egy\u00e9rtelm\u0171. A BleepingComputer arr\u00f3l sz\u00e1mol be, hogy k\u00fcl\u00f6n hivatalos CVE nincs kifejezetten a DirtyDecrypt n\u00e9vhez a k\u00f6zz\u00e9t\u00e9tel id\u0151pontj\u00e1ban, de Will Dormann elemz\u0151 \u00f6sszekapcsolja a k\u00f6zz\u00e9tett V12 r\u00e9szleteket a <strong>CVE-2026-31635<\/strong>, amelyet \u00e1prilis v\u00e9g\u00e9n jav\u00edtottak. A NVD adatb\u00e1zisban a CVE-2026-31635 \u00fagy van le\u00edrva, mint egy hiba az rxrpc-ben: az rxgk_verify_response() f\u00fcggv\u00e9ny helytelen\u00fcl ellen\u0151rizte a RESPONSE hiteles\u00edt\u0151 azonos\u00edt\u00f3 hossz\u00e1t, ami miatt egy t\u00fal nagy hiteles\u00edt\u0151 bejuthatott az rxgk_decrypt_skb()-be, \u00e9s a k\u00f3dot a BUG_ON(len) pontj\u00e1ra juttatta.<\/p>\n<p><noindex><\/p>\n<p>Ez\u00e9rt a nyilv\u00e1nos kiadv\u00e1nyok a DirtyDecrypt-et k\u00f6tik \u00f6ssze <strong><a rel=\"nofollow\" href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2026-31635\">CVE-2026-31635<\/a><\/strong>, de a NVD-ben tal\u00e1lhat\u00f3 hivatalos CVE le\u00edr\u00e1sa egyel\u0151re sz\u0171kebb \u00e9s els\u0151sorban az rxrpc-ben l\u00e9v\u0151 hosszellen\u0151rz\u00e9si hib\u00e1r\u00f3l besz\u00e9l, nem k\u00f6zvetlen\u00fcl a DirtyDecrypt\/DirtyCBC n\u00e9v mint k\u00fcl\u00f6n bejegyz\u00e9sr\u0151l. Ez\u00e9rt helyesebb lenne ezt \u00edrni: <em>A DirtyDecrypt val\u00f3sz\u00edn\u0171leg megfelel vagy szorosan kapcsol\u00f3dik a CVE-2026-31635-h\u00f6z.<\/em>, \u00e9s nem \u00e1ll\u00edtani, hogy ez a hivatalos neve a CVE-nek.<\/p>\n<p><\/noindex><\/p>\n<p>A kihaszn\u00e1l\u00e1shoz sz\u00fcks\u00e9ges egy olyan kernel, amelyben enged\u00e9lyezve van a <strong>CONFIG_RXGK<\/strong>, amely lehet\u0151v\u00e9 teszi az RxGK t\u00e1mogat\u00e1s\u00e1t az AFS kliens \u00e9s a h\u00e1l\u00f3zati sz\u00e1ll\u00edt\u00e1s sz\u00e1m\u00e1ra. Ez jelent\u0151sen sz\u0171k\u00edti a \u00e9rintett rendszerek k\u00f6r\u00e9t: els\u0151sorban azok a disztrib\u00faci\u00f3k \u00e9rintettek, amelyek gyorsan k\u00f6vetik az upstream kernelt, bele\u00e9rtve <strong>Fedora<\/strong>, <strong>Arch Linux<\/strong> \u00e9s <strong>openSUSE Tumbleweed<\/strong>. Ezzel egy\u00fctt a BleepingComputer kiemeli, hogy a k\u00f6zz\u00e9tett V12 PoC csak a Fedora \u00e9s a mainline kernel eset\u00e9ben lett tesztelve.<\/p>\n<p><noindex><\/p>\n<p>A DirtyDecrypt a Linux LPE s\u00e9r\u00fcl\u00e9kenys\u00e9gek egy sorozat\u00e1nak h\u00e1tter\u00e9ben jelent meg. Kor\u00e1bban felfedt\u00e9k <strong>M\u00e1sol\u00e1si hiba<\/strong> az algif_aead-ot, <strong>Dirty Frag<\/strong> a h\u00e1l\u00f3zati komponensekben, majd <strong>Fragnesia<\/strong> az XFRM ESP-in-TCP-ben. A 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\/\">le\u00edrta<\/a> a Dirty Frag-t mint lok\u00e1lis jogosults\u00e1g-n\u00f6vel\u00e9st az esp4, esp6 \u00e9s rxrpc komponensek r\u00e9v\u00e9n, amely lehet\u0151v\u00e9 teszi a t\u00e1mad\u00f3 sz\u00e1m\u00e1ra, hogy a helyi hozz\u00e1f\u00e9r\u00e9s megszerz\u00e9se ut\u00e1n root jogokat szerezzen \u00e9s r\u00f6gz\u00edtse mag\u00e1t a rendszerben.<\/p>\n<p><\/noindex><\/p>\n<p>Ezeknek a hib\u00e1knak a gyakorlati vesz\u00e9lye abban rejlik, hogy gyakran haszn\u00e1lj\u00e1k \u0151ket a kezdeti felt\u00f6r\u00e9s ut\u00e1n: p\u00e9ld\u00e1ul SSH-felhaszn\u00e1l\u00f3i fi\u00f3k, web shell, s\u00e9r\u00fcl\u00e9keny kont\u00e9ner vagy alacsony jogosults\u00e1g\u00fa szolg\u00e1ltat\u00f3 felhaszn\u00e1l\u00f3 kompromitt\u00e1l\u00e1sakor. Miut\u00e1n megszerezte a root jogosults\u00e1got, a t\u00e1mad\u00f3 letilthatja a v\u00e9delmi eszk\u00f6z\u00f6ket, olvashatja a titkos adatokat, m\u00f3dos\u00edthatja a napl\u00f3kat, fenntarthat\u00f3s\u00e1got alak\u00edthat ki \u00e9s tov\u00e1bbl\u00e9phet az infrastrukt\u00far\u00e1n.<\/p>\n<p>A potenci\u00e1lisan \u00e9rintett rolling-release disztrib\u00faci\u00f3k felhaszn\u00e1l\u00f3inak aj\u00e1nlott az utols\u00f3 kernel friss\u00edt\u00e9sek telep\u00edt\u00e9se. Az olyan rendszerek sz\u00e1m\u00e1ra, ahol a s\u00fcrg\u0151s friss\u00edt\u00e9s nem lehets\u00e9ges, a publik\u00e1ci\u00f3k eml\u00edtenek ideiglenes int\u00e9zked\u00e9seket, p\u00e9ld\u00e1ul a nem haszn\u00e1lt rxrpc modulok \u00e9s kapcsol\u00f3d\u00f3 komponensek letilt\u00e1s\u00e1t, azonban ezek a munkahelyi megold\u00e1sok megszak\u00edthatj\u00e1k az AFS-t \u00e9s n\u00e9h\u00e1ny IPsec\/VPN forgat\u00f3k\u00f6nyvet, \u00edgy ezeket csak a konkr\u00e9t rendszerre gyakorolt hat\u00e1s ellen\u0151rz\u00e9se ut\u00e1n szabad alkalmazni.<\/p>\n<p>A legt\u00f6bb asztali \u00e9s szerver telep\u00edt\u00e9s eset\u00e9n a kock\u00e1zat val\u00f3sz\u00edn\u0171leg alacsonyabb, mint a Copy Fail eset\u00e9n: a DirtyDecrypt megk\u00f6veteli a konkr\u00e9t kernel konfigur\u00e1ci\u00f3t \u00e9s a helyi k\u00f3d v\u00e9grehajt\u00e1s\u00e1t. Ennek ellen\u00e9re a Fedora, Arch Linux, openSUSE Tumbleweed \u00e9s egy\u00e9b gyors kernel-friss\u00edt\u00e9si rendszer eset\u00e9n a probl\u00e9ma figyelmet \u00e9rdemel: ez m\u00e1r nem egy elm\u00e9leti jelent\u00e9s, hanem egy k\u00f6zz\u00e9tett PoC-val rendelkez\u0151 s\u00e9r\u00fcl\u00e9kenys\u00e9g, amely vil\u00e1gos utat ad a jogosults\u00e1gok n\u00f6vel\u00e9s\u00e9re.<\/p>\n<p>Forr\u00e1s: <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\" 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\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.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/hu\/blog\/news\/opublikovan-poc-dlya-dirtydecrypt-novoj-lpe-uyazvimosti-v-yadre-linux\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" 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jogosults\u00e1g\u00fa felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra a jogok megszerz\u00e9s\u00e9t.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/opublikovan-poc-dlya-dirtydecrypt-novoj-lpe-uyazvimosti-v-yadre-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","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 | 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