{"id":182539,"date":"2026-07-08T10:54:16","date_gmt":"2026-07-08T08:54:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa"},"modified":"2026-07-08T10:54:16","modified_gmt":"2026-07-08T08:54:16","slug":"bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/bad-epoll-v-linux-i-android-nashli-uyazvimost-dlya-polucheniya-root-dostupa","title":{"rendered":"Hib\u00e1s Epoll: a Linux \u00e9s Android rendszerekben gy\u00f6k\u00e9r-hozz\u00e1f\u00e9r\u00e9st lehet\u0151v\u00e9 tev\u0151 sebezhet\u0151s\u00e9get tal\u00e1ltak.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

<\/i><\/a>
1 <\/p>\n

A vulnerability has been revealed in the Linux kernel. Rossz Epoll<\/strong>, bejegyzett mint CVE-2026-46242<\/a>. Ez lehet\u0151v\u00e9 teszi egy sima helyi felhaszn\u00e1l\u00f3 sz\u00e1m\u00e1ra, hogy k\u00fcl\u00f6nleges jogosults\u00e1gok n\u00e9lk\u00fcl emelje a jogosults\u00e1gokat root szintre. A kutat\u00e1s szerz\u0151je, Jay Chun szerint a probl\u00e9ma nemcsak a Linux asztali g\u00e9peket \u00e9s szervereket \u00e9rinti, hanem egyes Android-eszk\u00f6z\u00f6ket is az \u00fajabb kernel verzi\u00f3kon \u2014 ezt k\u00fcl\u00f6n kiemelik a Rossz Epoll le\u00edr\u00e1s\u00e1ban<\/a>.<\/p>\n

<\/noindex> <\/p>\n

A hiba a epoll<\/strong> alrendszerben tal\u00e1lhat\u00f3 \u2014 a Linux standard mechanizmusa, amely t\u00f6bb f\u00e1jlmeghajt\u00f3, h\u00e1l\u00f3zati kapcsolat \u00e9s bemeneti-kimeneti esem\u00e9ny nyomon k\u00f6vet\u00e9s\u00e9re szolg\u00e1l. Az ilyen mechanizmusokat akt\u00edvan haszn\u00e1lj\u00e1k a szerverek, b\u00f6ng\u00e9sz\u0151k \u00e9s h\u00e1l\u00f3zati szolg\u00e1ltat\u00e1sok, ez\u00e9rt az epoll-t egyszer\u0171en nem lehet letiltani. A technikai elemz\u00e9sben<\/a> a sebezhet\u0151s\u00e9get versenyhelyzetnek \u00edrj\u00e1k le, amely a k\u00f6vetkez\u0151t okozza use-after-free<\/strong>: amikor kapcsol\u00f3d\u00f3 epoll-objektumokat z\u00e1rnak le, az egyik sz\u00e1l felszabad\u00edtja a bels\u0151 strukt\u00far\u00e1kat, m\u00edg a m\u00e1sik tov\u00e1bbra is hozz\u00e1f\u00e9r ezekhez.<\/p>\n

<\/noindex> <\/p>\n

Pontosabban a probl\u00e9ma akkor jelentkezik, amikor egy epoll-meghajt\u00f3 figyeli a m\u00e1sikat, \u00e9s mindkett\u0151 p\u00e1rhuzamosan z\u00e1r\u00f3dik. Az __ep_remove() h\u00edv\u00e1sa ut\u00e1n a file->f_ep mez\u0151 ideiglenesen null\u00e1z\u00f3dik, \u00e9s a konkur\u00e1l\u00f3 __fput() \u00fagy d\u00f6nthet, hogy a tov\u00e1bbi tiszt\u00edt\u00e1s m\u00e1r nem sz\u00fcks\u00e9ges. Ennek k\u00f6vetkezt\u00e9ben a struct eventpoll objektum vagy a hozz\u00e1 kapcsol\u00f3d\u00f3 struct file t\u00fal kor\u00e1n felszabadul, de a k\u00f3d tov\u00e1bbra is a m\u00e1r felszabad\u00edtott mem\u00f3ria mutat\u00f3ival dolgozik. Ez adja a t\u00e1mad\u00f3nak a primit\u00edvet a kernel mem\u00f3ria megs\u00e9rt\u00e9s\u00e9hez.<\/p>\n

<\/p>\n

A t\u00e1mad\u00e1shoz nem sz\u00fcks\u00e9gesek tov\u00e1bbi k\u00e9pess\u00e9gek \u00e9s nem sz\u00fcks\u00e9gesek felhaszn\u00e1l\u00f3i nevek \u2014 el\u00e9g a CONFIG_EPOLL megl\u00e9te, ami k\u00fcl\u00f6n\u00f6sen kellemetlenn\u00e9 teszi a probl\u00e9m\u00e1t a szok\u00e1sos Linux rendszerek sz\u00e1m\u00e1ra. A kutat\u00f3 els\u0151dleges jelent\u00e9se szerint<\/a>, a hiba a kernelbe ker\u00fclt egy commit r\u00e9v\u00e9n 58c9b016e128<\/a> 2023-ban, \u00e9s a jav\u00edt\u00e1s a commit r\u00e9v\u00e9n t\u00f6rt\u00e9nt a6dc643c693<\/a>.<\/p>\n

<\/noindex> <\/p>\n

A nagyon sz\u0171k versenyk\u00f6r ablak ellen\u00e9re a kutat\u00f3 egy m\u0171k\u00f6d\u0151 exploitot k\u00e9sz\u00edtett a Google kernelCTF sz\u00e1m\u00e1ra. A kihaszn\u00e1l\u00e1s le\u00edr\u00e1s\u00e1ban<\/a> megmutatj\u00e1k, hogyan v\u00e1lik a hiba egy 8 b\u00e1jt hossz\u00fa bejegyz\u00e9ss\u00e9 a felszabad\u00edtott strukt\u00far\u00e1ban, majd kernel mem\u00f3ria sziv\u00e1rg\u00e1shoz vezet a \/proc\/self\/fdinfo-n kereszt\u00fcl, a file->f_op->poll megszak\u00edt\u00e1s\u00e1val, \u00e9s ROP l\u00e1nccal a root megszerz\u00e9s\u00e9hez. Az lts-6.12.67 c\u00e9lra a megb\u00edzhat\u00f3s\u00e1g k\u00f6r\u00fclbel\u00fcl 99%, a COS-ra pedig k\u00f6r\u00fclbel\u00fcl 98%; az Android exploit, a szerz\u0151 szerint, m\u00e9g fejleszt\u00e9s alatt \u00e1ll.<\/p>\n

<\/noindex> <\/p>\n

A \u00e9rintett kernel verzi\u00f3k, amelyek a 6.4-es \u00e1gra \u00e9s az \u00fajabbakra \u00e9p\u00fclnek<\/strong>, ha ezekben nem lett \u00e1tvezetve a jav\u00edt\u00e1s. A r\u00e9gi Android-eszk\u00f6z\u00f6k 6.1-es kernelj\u00e9n, bele\u00e9rtve a Pixel 8-at \u00e9s hasonl\u00f3 modelleket, a szerz\u0151 sebezhetetlennek tartja<\/a>. A felhaszn\u00e1l\u00f3knak \u00e9s az adminisztr\u00e1toroknak egyetlen norm\u00e1lis v\u00e9delmi lehet\u0151s\u00e9g marad \u2014 telep\u00edteni a kernel friss\u00edt\u00e9st a saj\u00e1t disztrib\u00faci\u00f3jukb\u00f3l vagy az eszk\u00f6z gy\u00e1rt\u00f3j\u00e1t\u00f3l.<\/p>\n

<\/noindex><\/p>\n

Forr\u00e1s: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

1 \u0412 \u044f\u0434\u0440\u0435 Linux \u0440\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c Bad Epoll, \u0437\u0430\u0440\u0435\u0433\u0438\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u043a\u0430\u043a CVE-2026-46242. \u041e\u043d\u0430 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043e\u0431\u044b\u0447\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 \u0431\u0435\u0437 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u0430\u0432 \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0434\u043e root. \u041f\u043e \u0434\u0430\u043d\u043d\u044b\u043c \u0430\u0432\u0442\u043e\u0440\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0414\u0436\u044d\u0451\u043d\u0430 \u0427\u043e\u043d\u0430, \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e Linux-\u0434\u0435\u0441\u043a\u0442\u043e\u043f\u044b \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u044b, \u043d\u043e \u0438 \u0447\u0430\u0441\u0442\u044c Android-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u043d\u0430 \u043d\u043e\u0432\u044b\u0445 \u0432\u0435\u0440\u0441\u0438\u044f\u0445 \u044f\u0434\u0440\u0430 \u2014 \u044d\u0442\u043e \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e \u043f\u043e\u0434\u0447\u0451\u0440\u043a\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0432 \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0438 Bad Epoll. \u041e\u0448\u0438\u0431\u043a\u0430 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-182539","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\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\udd47Bad Epoll: Linuxban \u00e9s Androidon tal\u00e1ltak sebezhet\u0151s\u00e9get root-hozz\u00e1f\u00e9r\u00e9s megszerz\u00e9s\u00e9re | 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