{"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\/es\/blog\/news\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","title":{"rendered":"GRO Frag \u2014 s\u00e9ptima vulnerabilidad de la clase Copy Fail, que otorga derechos de root en Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Se ha publicado un exploit para la s\u00e9ptima vulnerabilidad (1, 2-3, 4, 5, 6) en el kernel de Linux, que permite a un usuario local no privilegiado obtener derechos de root, sobrescribiendo datos en la cach\u00e9 de p\u00e1ginas. El identificador CVE a\u00fan no ha sido asignado, y adem\u00e1s del c\u00f3digo del exploit, no hay informaci\u00f3n adicional sobre el problema por el momento. La soluci\u00f3n est\u00e1 disponible solo en forma de parche, que fue publicado el 20 de mayo y fue aceptado en la rama principal del kernel de Linux el 21 de mayo (las versiones corregidas del kernel a\u00fan no est\u00e1n disponibles). <\/p>\n

La vulnerabilidad se encuentra en la implementaci\u00f3n de la tecnolog\u00eda GRO (Generic Receive Offload), utilizada para acelerar el procesamiento de paquetes segmentados. La vulnerabilidad es causada por un error en la implementaci\u00f3n del mecanismo zerocopy en la funci\u00f3n skb_gro_receive(), que realiza cambios directos en los datos en la cach\u00e9 de p\u00e1ginas para evitar un buffering innecesario. Con el flag SKBFL_MANAGED_FRAG_REFS activado, se omit\u00eda la preservaci\u00f3n de la referencia a las p\u00e1ginas de memoria liberadas en el campo shinfo->frags, y luego este campo se un\u00eda a otro skb sin modificar el contador de referencias, lo que llevaba a acceder a la memoria despu\u00e9s de su liberaci\u00f3n (use-after-free). Se pudo explotar el problema para sobrescribir datos en la cach\u00e9 de p\u00e1ginas manipulando el puntero al buffer io_uring. <\/p>\n

El ataque es posible en sistemas con el subsistema io_uring habilitado (io_uring_disabled=0). Para que el exploit funcione, debe haber un archivo ejecutable accesible en modo lectura con el flag SUID-root. El mecanismo de explotaci\u00f3n consiste en que el atacante logra que la base de usuarios se asiente en la cach\u00e9 de p\u00e1ginas, y luego inyecta en la cach\u00e9 la l\u00ednea \"hax::0:0::\/root:\/bin\/sh\". A continuaci\u00f3n, se ejecuta el comando \"su hax\", que no obtiene la base original de usuarios del almacenamiento, sino una copia modificada con un login fraudulentamente inyectado \"hax\", al que se le otorgan permisos de root y se le deja la contrase\u00f1a vac\u00eda. El funcionamiento del exploit ha sido probado en Ubuntu 24.04.
\n
Fuente: 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\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 s\u00e9ptima vulnerabilidad de la clase Copy Fail, que otorga derechos de root en Linux | ProHoster","description":"Se ha publicado un exploit para la s\u00e9ptima vulnerabilidad (1, 2-3, 4, 5, 6) en el kernel de Linux, que permite a un usuario local no privilegiado obtener derechos de root, sobrescribiendo datos en la cach\u00e9 de 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