{"id":182332,"date":"2026-06-27T08:48:07","date_gmt":"2026-06-27T06:48:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/pedit-cow-i-dirtyclone-uyazvimosti-v-yadre-linux-pozvolyayushhie-poluchit-root-cherez-izmenenie-stranichnogo-kesha"},"modified":"2026-06-27T08:48:07","modified_gmt":"2026-06-27T06:48:07","slug":"pedit-cow-i-dirtyclone-uyazvimosti-v-yadre-linux-pozvolyayushhie-poluchit-root-cherez-izmenenie-stranichnogo-kesha","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/pedit-cow-i-dirtyclone-uyazvimosti-v-yadre-linux-pozvolyayushhie-poluchit-root-cherez-izmenenie-stranichnogo-kesha","title":{"rendered":"PEdit-CoW i DirtyClone \u2014 ranjivosti u Linux kernelu koje omogu\u0107uju dobivanje root pristupa putem promjene stranice cache-a","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Otkrivene su informacije o dvije nove ranjivosti u Linux kernelu koje omogu\u0107uju neprivilegiranom korisniku da dobije root prava zapisivanjem podataka u stranici predmemorije. Za obje ranjivosti su pripremljeni radni eksploiti.<\/p>\n<ul>\n<li class=\"l\"> PEdit-CoW (CVE-2026-46331, eksploit 1, eksploit 2) \u2014 gre\u0161ka prilikom primjene mehanizma copy-on-write u kodu za izmjenu zaglavlja paketa (act_pedit), koji se koristi u planeru mre\u017enih paketa (net\/sched), omogu\u0107ava zapisivanje podataka izvan dodijeljenog bafera, \u0161to se mo\u017ee iskoristiti za prepisivanje podataka u stranicama predmemorije na odabranom pomaku. Gre\u0161ka je uzrokovana time \u0161to se provjera dozvoljenog podru\u010dja za zapis podataka provodila bez uzimanja u obzir da se pomak na ure\u0111ivana polja mo\u017ee promijeniti tijekom izvr\u0161enja operacije.\n<p>Problemi se javljaju od jezgre Linux 5.18 i otklonjeni su u izdanjima 7.1, 7.0.13, 6.18.36 i 6.12.94. Izvje\u0161teno je o mogu\u0107nosti iskori\u0161tavanja problema u RHEL 8\/9\/10, Debian 11\/12, openSUSE Leap 15.6, SUSE Linux 15-SP7\/16.0 i Ubuntu 18.04-25.10 (u verziji Ubuntu 26.4 po defaultu je onemogu\u0107eno stvaranje korisni\u010dkog prostora imena). Kao privremeno rje\u0161enje za za\u0161titu preporu\u010duje se onemogu\u0107avanje u\u010ditavanja jezgrenog modula act_pedit (prestanu raditi pravila ograni\u010denja prometa i prepisivanje zaglavlja putem \u201etc pedit\u201c).<\/p>\n<p>   echo \u201eblacklist act_pedit\u201c &gt; \/etc\/modprobe.d\/blacklist-act-pedit.conf<br \/>\n   rmmod act_pedit<\/p>\n<li class=\"l\"> DirtyClone (CVE-2026-43503, eksploit) \u2014 zaobi\u0111ivanje exploita za ranjivost Dirty Frag u modulu xfrm-ESP, koji se koristi za ubrzanje operacija \u0161ifriranja u IPsec-u s protokolom ESP (Encapsulating Security Payload). Za kloniranje strukture skb u novom exploit-u koristi se manipulacija s TEE-ekstenzijom za netfilter (modul xt_TEE), koji izvr\u0161ava operaciju kloniranja mre\u017enih paketa.\n<p>Ranjivost je ispravljena u izdanjima Linux kernela 7.1, 7.0.10, 5.10.257, 5.15.208, 6.1.174, 6.6.141, 6.12.91 i 6.18.33. Problem se javlja u Debianu, Ubuntuu, Fedori,<br \/>\nRHEL-u i SUSE-u. Kao zaobilazno rje\u0161enje za blokiranje ranjivosti mo\u017ee se zabraniti u\u010ditavanje modula kernela esp4 i esp6.<\/p>\n<\/ul>\n<p>Za iskori\u0161tavanje obje ranjivosti potrebna su prava pristupa CAP_NET_ADMIN, koja neprivilegirani korisnik mo\u017ee dobiti stvaranjem prostora imena identifikatora korisnika (user namespace). U Ubuntu takva operacija je po defaultu onemogu\u0107ena, ali se mo\u017ee dozvoliti putem sysctl \u201ekernel.apparmor_restrict_unprivileged_userns=0\u201c ili AppArmor profila. U ostalim distribucijama dostupnost \u201euser namespace\u201c za neprivilegirane korisnike ovisi o postavljanju sysctl \u201ekernel.unprivileged_userns_clone\u201c (ako je 0, onda je onemogu\u0107eno). <\/p>\n<p>Iskori\u0161tavanje ranjivosti svodi se na \u010ditanje datoteke programa \/bin\/su s suid root zastavicom, za njegovo smje\u0161tanje u ke\u0161u stranica, i zamjenu u ke\u0161u dijela koda programa kodom za pokretanje \/bin\/sh. Posljedovno pokretanje programa dovest \u0107e do toga da \u0107e u memoriju biti u\u010ditan neoriginalni izvr\u0161ni datoteka s povr\u0161ine, ve\u0107 promijenjena kopija iz ke\u0161a stranica.  <\/p>\n<p>Dodatno se mo\u017ee primijetiti stvaranje exploita za ranjivost CVE-2026-23111 u podsustavu nf_tables, koja je otklonjena u velja\u010danskim a\u017euriranjima Linux jezgre. Ranjivost je uzrokovana pristupom memoriji nakon \u0161to je oslobo\u0111ena (use-after-free) i omogu\u0107ava neprivilegiranom korisniku da dobije root prava u sustavu. Za napad tako\u0111er je potrebno da korisnik ima mogu\u0107nost stvaranja prostora imena identiteta korisnika (user namespace). Rad exploita demonstriran je u<br \/>\nDebian 12\/13 i Ubuntu 22.04\/24.04.<br \/>\n<br \/>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65784\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u0434\u0432\u0443\u0445 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \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, \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. \u0414\u043b\u044f \u043e\u0431\u0435\u0438\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u044b \u0440\u0430\u0431\u043e\u0447\u0438\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u044b. PEdit-CoW (CVE-2026-46331, \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 1, \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442 2) &#8212; \u043e\u0448\u0438\u0431\u043a\u0430 \u043f\u0440\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 copy-on-write \u0432 \u043a\u043e\u0434\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043a\u043e\u0432 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 (act_pedit), \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u043c \u0432 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0435 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 (net\/sched), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u044b [&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-182332","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u0434\u0432\u0443\u0445 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 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podataka u ke\u0161u stranica.","canonical_url":"https:\/\/prohoster.info\/hr\/blog\/news\/pedit-cow-i-dirtyclone-uyazvimosti-v-yadre-linux-pozvolyayushhie-poluchit-root-cherez-izmenenie-stranichnogo-kesha","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hr_HR","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\udd47PEdit-CoW \u0438 DirtyClone \u2014 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u044f\u0434\u0440\u0435 Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c root \u0447\u0435\u0440\u0435\u0437 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