cve-2024-35884
Vulnerability from cvelistv5
Published
2024-05-19 08:34
Modified
2024-11-13 18:46
Severity ?
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
udp: do not accept non-tunnel GSO skbs landing in a tunnel
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3001e7aa43d6691db2a878b0745b854bf12ddd19
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3391b157780bbedf8ef9f202cbf10ee90bf6b0f8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/35fe0e0b5c00bef7dde74842a2564c43856fbce4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d010c8031e39f5fa1e8b13ada77e0321091011f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d12245080cb259d82b34699f6cd4ec11bdb688bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d49ae15a5767d4e9ef8bbb79e42df1bfebc94670
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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It\u0027s OK to keep the current\\nlogic there as it should cover most cases but we also need to make sure\\nwe handle tunnel packets being GROed too early.\\n\\nThis is done by extending the checks in udp_unexpected_gso: GSO packets\\nlacking the SKB_GSO_UDP_TUNNEL/_CSUM bits and landing in a tunnel must\\nbe segmented.\\n\\n[1] kernel BUG at net/core/skbuff.c:4408!\\n    RIP: 0010:skb_segment+0xd2a/0xf70\\n    __udp_gso_segment+0xaa/0x560\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: udp: no acepte skbs GSO que no sean de t\u00fanel que aterricen en un t\u00fanel Cuando rx-udp-gro-forwarding est\u00e1 habilitado, los paquetes UDP pueden recibir GRO al reenviarse. Si dichos paquetes pudieran aterrizar en un t\u00fanel, esto puede causar varios problemas y udp_gro_receive se asegura de que este no sea el caso buscando un socket coincidente. Esto se realiza en udp4/6_gro_lookup_skb pero s\u00f3lo en las redes actuales. Este es un problema con los paquetes tunelizados cuando el punto final est\u00e1 en otra red. En tales casos, los paquetes se almacenar\u00e1n en el nivel UDP, lo que generar\u00e1 varios problemas m\u00e1s adelante. Lo mismo puede pasar con rx-gro-list. Vimos esto con paquetes geneve siendo GRO en el nivel UDP. En tal caso, se establece gso_size; luego, el paquete pasa por la ruta geneve rx, se extrae el encabezado geneve, se ajusta el desplazamiento y los skbs frag_list no se ajustan con respecto a geneve. Cuando esos skbs lleguen a skb_fragment, se comportar\u00e1 mal. Son posibles diferentes resultados dependiendo del aspecto de los skbs GROed; desde paquetes corruptos hasta fallas del kernel. Un ejemplo es un BUG_ON[1] activado en skb_segment mientras se procesa frag_list. Debido a que gso_size es incorrecto (se extrajo el encabezado geneve), skb_segment cree que hay un \\\"tama\u00f1o de encabezado geneve\\\" de datos en frag_list, aunque en realidad es el siguiente paquete. 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}


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