{"id":172753,"date":"2026-05-19T18:24:36","date_gmt":"2026-05-19T16:24:36","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux"},"modified":"2026-05-19T18:24:36","modified_gmt":"2026-05-19T16:24:36","slug":"pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/news\/pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","title":{"rendered":"PinTheft — die sechste Schwachstelle der Copy Fail-Klasse, die root-Rechte in Linux erm\u00f6glicht","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Information about the sixth vulnerability (1, 2-3, 4, 5) has been revealed, allowing an unprivileged local user to gain root rights by overwriting data in the page cache. The vulnerability is codenamed PinTheft. A prototype exploit is available. A CVE identifier has not yet been assigned. A fix is currently available only as a patch, which was published on May 5 and accepted into the netdev branch on May 11, but not included in the corrective kernel releases. <\/p>\n

The vulnerability is present in the implementation of the RDS (Reliable Datagram Sockets) network protocol, designed for high-speed message exchange between nodes in a cluster, with minimal latency and guaranteed delivery. An attack is possible on systems with the io_uring subsystem enabled (io_uring_disabled=0) and a kernel built with the CONFIG_RDS, CONFIG_RDS_TCP, and CONFIG_IO_URING options. For the exploit to work, there must be a readable executable file with the SUID-root flag in the system. <\/p>\n

Um das Kernelmodul rds_tcp automatisch zu laden, fordert der Exploit den Versand von Daten \u00fcber RDS mit dem Transport SO_RDS_TRANSPORT=2 an. Es wird festgestellt, dass das Kernelmodul rds in der Standardkonfiguration nur in Arch Linux bereitgestellt wird unter den getesteten Linux-Distributionen. Um die Schwachstelle zu umgehen, kann die automatische Ladefunktion der Kernelmodule rds und rds_tcp gesperrt werden: rmmod rds_tcp rds printf 'install rds \/bin\/false\ninstall rds_tcp \/bin\/false\n' > \/etc\/modprobe.d\/pintheft.conf <\/p>\n

Die Schwachstelle wird durch einen Fehler in der Implementierung des Zerocopy-Mechanismus in der Funktion rds_message_zcopy_from_user() verursacht, die direkte \u00c4nderungen der Daten im Seiten-Cache vornimmt, um \u00fcberfl\u00fcssiges Puffern zu vermeiden. Bei einem Fehler wurde das Feld rm->data.op_nents nicht zur\u00fcckgesetzt, was zu einer doppelten Freigabe des Buffers (double-free) f\u00fchrte. Es gelang, einen falschen Wert im Referenzz\u00e4hler auszunutzen, um Daten im Seiten-Cache neu zu schreiben, indem der Zeiger auf den festen io_uring-Buffer manipuliert wurde. <\/p>\n

Ansonsten ist der Exploit-Mechanismus typisch f\u00fcr alle Schwachstellen dieser Art \u2014 der Angreifer erreicht es, dass eine Programmdatei mit dem SUID-Root-Flag im Seiten-Cache gespeichert wird, und ersetzt dann den Code im ELF-Header durch den Code zum Starten von \/usr\/bin\/sh. Nach dieser Manipulation f\u00fchrt das Starten des Programms dazu, dass nicht die originale ausf\u00fchrbare Datei vom Speicher geladen wird, sondern eine ver\u00e4nderte Kopie aus dem Seiten-Cache. Im Gegensatz zu fr\u00fcheren Exploits ist die neue Variante speziell f\u00fcr den Angriff auf das Dienstprogramm \u201esu\u201c angepasst, kann aber auch angewendet werden, wenn im System solche SUID-Programme wie mount, passwd, chsh, newgrp, umount und pkexec vorhanden sind.
\n
Quelle: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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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-172753","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\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\udd47PinTheft \u2013 die sechste Schwachstelle der Copy Fail-Klasse, die Root-Rechte in Linux gew\u00e4hrt | ProHoster","description":"Informationen \u00fcber die sechste Schwachstelle (1, 2-3, 4, 5) wurden offengelegt, die es einem nicht privilegierten lokalen Benutzer erm\u00f6glicht, Root-Rechte zu erlangen, indem er Daten im Seitencache \u00fcberschreibt.","canonical_url":"https:\/\/prohoster.info\/de\/blog\/news\/pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"de_DE","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\udd47PinTheft \u2014 \u0448\u0435\u0441\u0442\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 | 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