{"id":181668,"date":"2026-05-23T00:25:11","date_gmt":"2026-05-22T22:25:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux"},"modified":"2026-05-23T00:25:11","modified_gmt":"2026-05-22T22:25:11","slug":"gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","title":{"rendered":"GRO Frag \u2014 a Copy Fail oszt\u00e1ly hetedik s\u00e9r\u00fcl\u00e9kenys\u00e9ge, amely root jogokat biztos\u00edt Linuxban","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Nyilv\u00e1nosan el\u00e9rhet\u0151v\u00e9 v\u00e1lt a Linux kernel hetedik sebezhet\u0151s\u00e9g\u00e9re vonatkoz\u00f3 exploit (1, 2-3, 4, 5, 6), amely lehet\u0151v\u00e9 teszi, hogy egy nem privilegiz\u00e1lt helyi felhaszn\u00e1l\u00f3 root jogosults\u00e1got szerezzen az\u00e1ltal, hogy adatokat \u00edr fel\u00fcl a lapoz\u00f3 cache-ben. A CVE azonos\u00edt\u00f3 m\u00e9g nem ker\u00fclt kiad\u00e1sra, a probl\u00e9ma mibenl\u00e9t\u00e9r\u0151l egyel\u0151re csak az exploit k\u00f3d \u00e1ll rendelkez\u00e9sre. A jav\u00edt\u00e1s csak patch form\u00e1j\u00e1ban \u00e9rhet\u0151 el, amelyet m\u00e1jus 20-\u00e1n tettek k\u00f6zz\u00e9, \u00e9s m\u00e1jus 21-\u00e9n elfogadt\u00e1k a Linux kernel f\u0151 \u00e1t\u00e9be (a jav\u00edt\u00f3 kernel verzi\u00f3k m\u00e9g nem el\u00e9rhet\u0151k). <\/p>\n

A sebezhet\u0151s\u00e9g a GRO (Generic Receive Offload) technol\u00f3gia megval\u00f3s\u00edt\u00e1s\u00e1ban rejlik, amely a szegment\u00e1lt csomagok feldolgoz\u00e1s\u00e1nak felgyors\u00edt\u00e1s\u00e1ra szolg\u00e1l. A sebezhet\u0151s\u00e9get a zerocopy mechanizmus\u00e1nak hib\u00e1ja okozza az skb_gro_receive() funkci\u00f3ban, amely k\u00f6zvetlen\u00fcl m\u00f3dos\u00edtja az adatokat az oldal cache-ben, elker\u00fclve a felesleges pufferez\u00e9st. A SKBFL_MANAGED_FRAG_REFS jelz\u0151 be\u00e1ll\u00edt\u00e1sakor elmaradt a hivatkoz\u00e1s meg\u0151rz\u00e9se a felszabad\u00edtott mem\u00f3riaoldalakra a shinfo->frags mez\u0151ben, ami ut\u00e1n ez a mez\u0151 egy m\u00e1sik skb-hez csatlakozott a referencia sz\u00e1ml\u00e1l\u00f3 megv\u00e1ltoztat\u00e1sa n\u00e9lk\u00fcl, ez pedig a mem\u00f3ria felszabad\u00edt\u00e1sa ut\u00e1ni hozz\u00e1f\u00e9r\u00e9shez (use-after-free) vezetett. A probl\u00e9m\u00e1t siker\u00fclt kihaszn\u00e1lni az oldal cache jellemz\u0151inek fel\u00fcl\u00edr\u00e1s\u00e1ra az io_uring puffert mutat\u00f3 mutat\u00f3 manipul\u00e1l\u00e1s\u00e1val. <\/p>\n

A t\u00e1mad\u00e1s lehets\u00e9ges a io_uring (io_uring_disabled=0) alrendszerrel rendelkez\u0151 rendszereken. Az exploit m\u0171k\u00f6d\u00e9s\u00e9hez egy olvashat\u00f3 SUID-root jelz\u0151vel rendelkez\u0151 v\u00e9grehajthat\u00f3 f\u00e1jlra van sz\u00fcks\u00e9g a rendszerben. A kihaszn\u00e1l\u00e1s mechanizmusa abban rejlik, hogy a t\u00e1mad\u00f3 el\u00e9ri a felhaszn\u00e1l\u00f3i adatb\u00e1zis t\u00e1rol\u00e1s\u00e1t az oldal cache-ben, majd beilleszt egy sort a cache-be: «hax::0:0::\/root:\/bin\/sh». Ezt k\u00f6vet\u0151en elindul a «su hax» parancs, amely nem az eredeti felhaszn\u00e1l\u00f3i adatb\u00e1zist kapja a t\u00e1rol\u00f3r\u00f3l, hanem a hamis bel\u00e9p\u0151vel rendelkez\u0151 m\u00f3dos\u00edtott m\u00e1solatot, amelynek jogai root \u00e9s \u00fcres jelsz\u00f3. Az exploit m\u0171k\u00f6d\u00e9s\u00e9t az Ubuntu 24.04 verzi\u00f3n tesztelt\u00e9k.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u0434\u043b\u044f \u0441\u0435\u0434\u044c\u043c\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5, 6) \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\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, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0447\u043d\u043e\u043c \u043a\u044d\u0448\u0435. 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[…]<\/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-181668","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47GRO Frag \u2014 a Linuxban root jogosults\u00e1got biztos\u00edt\u00f3 Copy Fail oszt\u00e1lyba tartoz\u00f3 hetedik sebezhet\u0151s\u00e9g | ProHoster","description":"Nyilv\u00e1nosan el\u00e9rhet\u0151v\u00e9 v\u00e1lt a Linux kernel hetedik sebezhet\u0151s\u00e9g\u00e9re vonatkoz\u00f3 exploit (1, 2-3, 4, 5, 6), amely lehet\u0151v\u00e9 teszi, hogy egy nem privilegiz\u00e1lt helyi felhaszn\u00e1l\u00f3 root jogosults\u00e1got szerezzen az\u00e1ltal, hogy adatokat \u00edr fel\u00fcl a lapoz\u00f3 cache-ben.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-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\udd47GRO Frag \u2014 \u0441\u0435\u0434\u044c\u043c\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043b\u0430\u0441\u0441\u0430 Copy Fail, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u0440\u0430\u0432\u0430 root \u0432 Linux | ProHoster","og:description":"\u0412 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 \u0434\u043b\u044f \u0441\u0435\u0434\u044c\u043c\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5, 6) \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\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, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0447\u043d\u043e\u043c \u043a\u044d\u0448\u0435.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2026-05-22T22:25:11+00:00","article:modified_time":"2026-05-22T22:25:11+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/181668","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=181668"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/181668\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=181668"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=181668"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=181668"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}