{"id":182595,"date":"2026-07-10T22:54:14","date_gmt":"2026-07-10T20:54:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-linux-raskryta-uyazvimost-ghostlock-pozvolyayushhaya-poluchit-root-dostup"},"modified":"2026-07-10T22:54:14","modified_gmt":"2026-07-10T20:54:14","slug":"v-linux-raskryta-uyazvimost-ghostlock-pozvolyayushhaya-poluchit-root-dostup","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/v-linux-raskryta-uyazvimost-ghostlock-pozvolyayushhaya-poluchit-root-dostup","title":{"rendered":"V Linuxu byla odhalena zranitelnost GhostLock, kter\u00e1 umo\u017e\u0148uje z\u00edsk\u00e1n\u00ed root p\u0159\u00edstupu.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

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1 <\/p>\n

V j\u00e1dru Linux byla odhalena zranitelnost CVE-2026-43499<\/a>, kter\u00e1 nese neofici\u00e1ln\u00ed n\u00e1zev GhostLock. Probl\u00e9m se t\u00fdk\u00e1 k\u00f3du rtmutex a mechanismu futex s d\u011bd\u011bn\u00edm priorit, a jeho vyu\u017eit\u00ed m\u016f\u017ee umo\u017enit m\u00edstn\u00edmu nepovolen\u00e9mu u\u017eivateli z\u00edskat pr\u00e1va na \u00farovni root. Podle AlmaLinux<\/a>, zranitelnost m\u016f\u017ee b\u00fdt tak\u00e9 vyu\u017eita z kontejneru k p\u0159\u00edstupu na hostitele, pokud syst\u00e9m b\u011b\u017e\u00ed na neaktualizovan\u00e9m j\u00e1dru.<\/p>\n

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

Podstata chyby spo\u010d\u00edv\u00e1 ve funkci remove_waiter() v kernel\/locking\/rtmutex.c. Jak je uvedeno v popisu NVD<\/a>, p\u0159i vracen\u00ed proxy-locku ve sc\u00e9n\u00e1\u0159i futex_requeue() funkce pracovala s aktu\u00e1ln\u00edm \u00fakolem (current), a\u010dkoli by m\u011bla vymazat stav toho \u00fakolu, kter\u00fd skute\u010dn\u011b \u010dekal na z\u00e1mek (waiter::task). V d\u016fsledku toho nemuselo b\u00fdt stav pi_blocked_on spr\u00e1vn\u011b vymaz\u00e1no, co\u017e vedlo k vis\u00edc\u00edmu ukazateli a vytvo\u0159ilo p\u0159edpoklad pro use-after-free.<\/p>\n

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

V\u00fdzkumn\u00edci z Nebula Security popisuj\u00ed GhostLock<\/a> jako chybu, kter\u00e1 p\u0159etrv\u00e1vala v hlavn\u00edch distribuc\u00edch Linuxu od roku 2011. Ve\u0159ejn\u00e1 diskuse o zranitelnosti zv\u00fd\u0161ila riziko pro servery a kontejnery: CloudLinux<\/a> specificky varuje, \u017ee pro CVE-2026-43499 ji\u017e existuje ve\u0159ejn\u00fd proof-of-concept, a proto by spr\u00e1vci nem\u011bli odkl\u00e1dat aktualizaci j\u00e1dra.<\/p>\n

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

Oprava v upstreamu spo\u010d\u00edv\u00e1 v tom, \u017ee remove_waiter() by m\u011bl pou\u017e\u00edvat waiter::task, nikoli current, ve v\u0161ech p\u0159\u00edslu\u0161n\u00fdch operac\u00edch. Na to poukazuje i GitHub Advisory Database<\/a>, kde jsou uvedeny d\u016fsledky chyby: nespr\u00e1vn\u00e9 odstran\u011bn\u00ed z rbtree bez pot\u0159ebn\u00e9 blokace, nevymazan\u00fd stav pi_blocked_on a pr\u00e1ce rt_mutex_adjust_prio_chain() ne s t\u00edm \u00fakolem.<\/p>\n

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

U\u017eivatel\u016fm linuxov\u00fdch distribuc\u00ed se doporu\u010duje nainstalovat \u010derstv\u00e9 aktualizace j\u00e1dra z ofici\u00e1ln\u00edch repozit\u00e1\u0159\u016f. Zranitelnost m\u00e1 lok\u00e1ln\u00ed charakter, tak\u017ee sama o sob\u011b neposkytuje vzd\u00e1len\u00fd p\u0159\u00edstup, ale na v\u00edceu\u017eivatelsk\u00fdch serverech, CI infrastruktu\u0159e, hostingu a syst\u00e9mech s kontejnery je riziko znateln\u011b vy\u0161\u0161\u00ed: \u00fasp\u011b\u0161n\u00e9 vyu\u017eit\u00ed prom\u011bn\u00ed ji\u017e z\u00edskan\u00fd n\u00edzko privilegovan\u00fd p\u0159\u00edstup v plnou kontrolu nad syst\u00e9mem.<\/p>\n

Zdroj: 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 CVE-2026-43499, \u043f\u043e\u043b\u0443\u0447\u0438\u0432\u0448\u0430\u044f \u043d\u0435\u043e\u0444\u0438\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0435 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 GhostLock. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u043a\u043e\u0434 rtmutex \u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c futex \u0441 \u043d\u0430\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043f\u0440\u0438\u043e\u0440\u0438\u0442\u0435\u0442\u0430, \u0430 \u0435\u0451 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442\u044c \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\u0432\u044b\u0441\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 \u0434\u043e root. \u041f\u043e \u0434\u0430\u043d\u043d\u044b\u043c AlmaLinux, \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0442\u0430\u043a\u0436\u0435 \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0438\u0437 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430 \u0434\u043b\u044f \u0432\u044b\u0445\u043e\u0434\u0430 \u043d\u0430 \u0445\u043e\u0441\u0442, \u0435\u0441\u043b\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u043d\u0430 \u043d\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0451\u043d\u043d\u043e\u043c \u044f\u0434\u0440\u0435. \u0421\u0443\u0442\u044c \u043e\u0448\u0438\u0431\u043a\u0438 […]<\/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-182595","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\n","aioseo_head_json":{"title":"\ud83e\udd47V Linuxu byla odhalena zranitelnost GhostLock, kter\u00e1 umo\u017e\u0148uje z\u00edskat root p\u0159\u00edstup | ProHoster","description":"1 V j\u00e1dru Linux byla odhalena 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