CVE-2024-35973
Estado: ModificadaMedia (5.5)—
Detalles técnicos trazas, registros y código del informe original
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: geneve: corrige la validación del encabezado en geneve[6]_xmit_skb syzbot puede activar un valor uninit en geneve_xmit() [1] Problema: mientras que la mayoría de los asistentes de túnel IP (como ip_tunnel_get_dsfield( )) usa skb_protocol(skb, true), pskb_inet_may_pull() solo usa skb->protocol. Si se encuentra algo más que ETH_P_IPV6 o ETH_P_IP en skb->protocol, pskb_inet_may_pull() no hace nada en absoluto. Si la persona que llama proporcionó una etiqueta vlan (af_packet en el caso de syzbot), es posible que el encabezado de la red no apunte a la ubicación correcta y que la parte lineal de skb sea más pequeña de lo esperado. Agregue skb_vlan_inet_prepare() para realizar una validación completa de Mac. Utilice esto en Ginebra por el momento. Sospecho que debemos adoptarlo de manera más amplia. v4: Jakub informó que v3 rompió la autoprueba de l2_tos_ttl_inherit.sh: solo llame a __vlan_get_protocol() para tipos de VLAN. v2,v3: se abordaron los comentarios de Sabrina sobre v1 y v2 [1] ERROR: KMSAN: valor uninit en geneve_xmit_skb drivers/net/geneve.c:910 [en línea] ERROR: KMSAN: valor uninit en geneve_xmit+0x302d/0x5420 drivers/ net/geneve.c:1030 geneve_xmit_skb drivers/net/geneve.c:910 [en línea] geneve_xmit+0x302d/0x5420 drivers/net/geneve.c:1030 __netdev_start_xmit include/linux/netdevice.h:4903 [en línea] netdev_start_xmit include/ linux/netdevice.h:4917 [en línea] xmit_one net/core/dev.c:3531 [en línea] dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547 __dev_queue_xmit+0x348d/0x52c0 net/core/dev.c: 4335 dev_queue_xmit include/linux/netdevice.h:3091 [en línea] paquete_xmit+0x9c/0x6c0 net/packet/af_packet.c:276 paquete_snd net/packet/af_packet.c:3081 [en línea] packet_sendmsg+0x8bb0/0x9ef0 net/packet/ af_packet.c:3113 sock_sendmsg_nosec net/socket.c:730 [en línea] __sock_sendmsg+0x30f/0x380 net/socket.c:745 __sys_sendto+0x685/0x830 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [en línea ] __se_sys_sendto net/socket.c:2199 [en línea] __x64_sys_sendto+0x125/0x1d0 net/socket.c:2199 do_syscall_64+0xd5/0x1f0 Entry_SYSCALL_64_after_hwframe+0x6d/0x75 Uninit se creó en slab_post_alloc _hook mm/slub.c:3804 [en línea] slab_alloc_node mm/slub.c:3845 [en línea] kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577 __alloc_skb+0x35b/0x7a0 net/core/skbuff.c: 668 alloc_skb include/linux/skbuff.h:1318 [en línea] alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504 sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795 paquete_alloc_skb net/packet/af_packet.c :2930 [en línea] paquete_snd net/packet/af_packet.c:3024 [en línea] paquete_sendmsg+0x722d/0x9ef0 net/packet/af_packet.c:3113 sock_sendmsg_nosec net/socket.c:730 [en línea] __sock_sendmsg+0x30f/0x380 net/ Socket.c: 745 __sys_sendto+0x685/0x830 net/Socket.c: 2191 __do_sys_sendto net/Socket.c: 2203 [en línea] __se_sys_sendto net/Socket.c: 2199 [Inline] __X64_SYS_SENDTO+0x125/0x1d0 net/Socket/Socket. 2199 do_syscall_64+0xd5/0x1f0 Entry_SYSCALL_64_after_hwframe+0x6d/0x75 CPU: 0 PID: 5033 Comm: syz-executor346 No contaminado 6.9.0-rc1-syzkaller-00005-g928a87efa423 #0 Nombre de hardware: Google Google Compute Engine/Google Motor de cómputo, BIOS Google 29/02/2024
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.25%
- Percentil entre todas las CVEs puntuadas: 15
- Fecha de la puntuación: 8/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (2)
CWE
- CWE-908
Referencias
- https://git.kernel.org/stable/c/10204df9beda4978bd1d0c2db0d8375bfb03b915
- https://git.kernel.org/stable/c/190d9efa5773f26d6f334b1b8be282c4fa13fd5e
- https://git.kernel.org/stable/c/357163fff3a6e48fe74745425a32071ec9caf852
- https://git.kernel.org/stable/c/3c1ae6de74e3d2d6333d29a2d3e13e6094596c79
- https://git.kernel.org/stable/c/43be590456e1f3566054ce78ae2dbb68cbe1a536
- https://git.kernel.org/stable/c/4a1b65d1e55d53b397cb27014208be1e04172670
- https://git.kernel.org/stable/c/d3adf11d7993518a39bd02b383cfe657ccc0023c
- https://git.kernel.org/stable/c/d8a6213d70accb403b82924a1c229e733433a5ef
- https://git.kernel.org/stable/c/10204df9beda4978bd1d0c2db0d8375bfb03b915
- https://git.kernel.org/stable/c/190d9efa5773f26d6f334b1b8be282c4fa13fd5e
- https://git.kernel.org/stable/c/357163fff3a6e48fe74745425a32071ec9caf852
- https://git.kernel.org/stable/c/3c1ae6de74e3d2d6333d29a2d3e13e6094596c79
- https://git.kernel.org/stable/c/43be590456e1f3566054ce78ae2dbb68cbe1a536
- https://git.kernel.org/stable/c/4a1b65d1e55d53b397cb27014208be1e04172670
- https://git.kernel.org/stable/c/d3adf11d7993518a39bd02b383cfe657ccc0023c
- https://git.kernel.org/stable/c/d8a6213d70accb403b82924a1c229e733433a5ef
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-613116.html
JSON original (NVD)
Mostrar
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{
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],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-908"
}
]
}
],
"descriptions": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngeneve: fix header validation in geneve[6]_xmit_skb\n\nsyzbot is able to trigger an uninit-value in geneve_xmit() [1]\n\nProblem : While most ip tunnel helpers (like ip_tunnel_get_dsfield())\nuses skb_protocol(skb, true), pskb_inet_may_pull() is only using\nskb->protocol.\n\nIf anything else than ETH_P_IPV6 or ETH_P_IP is found in skb->protocol,\npskb_inet_may_pull() does nothing at all.\n\nIf a vlan tag was provided by the caller (af_packet in the syzbot case),\nthe network header might not point to the correct location, and skb\nlinear part could be smaller than expected.\n\nAdd skb_vlan_inet_prepare() to perform a complete mac validation.\n\nUse this in geneve for the moment, I suspect we need to adopt this\nmore broadly.\n\nv4 - Jakub reported v3 broke l2_tos_ttl_inherit.sh selftest\n - Only call __vlan_get_protocol() for vlan types.\n\nv2,v3 - Addressed Sabrina comments on v1 and v2\n\n[1]\n\nBUG: KMSAN: uninit-value in geneve_xmit_skb drivers/net/geneve.c:910 [inline]\n BUG: KMSAN: uninit-value in geneve_xmit+0x302d/0x5420 drivers/net/geneve.c:1030\n geneve_xmit_skb drivers/net/geneve.c:910 [inline]\n geneve_xmit+0x302d/0x5420 drivers/net/geneve.c:1030\n __netdev_start_xmit include/linux/netdevice.h:4903 [inline]\n netdev_start_xmit include/linux/netdevice.h:4917 [inline]\n xmit_one net/core/dev.c:3531 [inline]\n dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547\n __dev_queue_xmit+0x348d/0x52c0 net/core/dev.c:4335\n dev_queue_xmit include/linux/netdevice.h:3091 [inline]\n packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276\n packet_snd net/packet/af_packet.c:3081 [inline]\n packet_sendmsg+0x8bb0/0x9ef0 net/packet/af_packet.c:3113\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x30f/0x380 net/socket.c:745\n __sys_sendto+0x685/0x830 net/socket.c:2191\n __do_sys_sendto net/socket.c:2203 [inline]\n __se_sys_sendto net/socket.c:2199 [inline]\n __x64_sys_sendto+0x125/0x1d0 net/socket.c:2199\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:3804 [inline]\n slab_alloc_node mm/slub.c:3845 [inline]\n kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888\n kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577\n __alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668\n alloc_skb include/linux/skbuff.h:1318 [inline]\n alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504\n sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795\n packet_alloc_skb net/packet/af_packet.c:2930 [inline]\n packet_snd net/packet/af_packet.c:3024 [inline]\n packet_sendmsg+0x722d/0x9ef0 net/packet/af_packet.c:3113\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x30f/0x380 net/socket.c:745\n __sys_sendto+0x685/0x830 net/socket.c:2191\n __do_sys_sendto net/socket.c:2203 [inline]\n __se_sys_sendto net/socket.c:2199 [inline]\n __x64_sys_sendto+0x125/0x1d0 net/socket.c:2199\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nCPU: 0 PID: 5033 Comm: syz-executor346 Not tainted 6.9.0-rc1-syzkaller-00005-g928a87efa423 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024"
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"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: geneve: corrige la validación del encabezado en geneve[6]_xmit_skb syzbot puede activar un valor uninit en geneve_xmit() [1] Problema: mientras que la mayoría de los asistentes de túnel IP (como ip_tunnel_get_dsfield( )) usa skb_protocol(skb, true), pskb_inet_may_pull() solo usa skb->protocol. Si se encuentra algo más que ETH_P_IPV6 o ETH_P_IP en skb->protocol, pskb_inet_may_pull() no hace nada en absoluto. Si la persona que llama proporcionó una etiqueta vlan (af_packet en el caso de syzbot), es posible que el encabezado de la red no apunte a la ubicación correcta y que la parte lineal de skb sea más pequeña de lo esperado. Agregue skb_vlan_inet_prepare() para realizar una validación completa de Mac. Utilice esto en Ginebra por el momento. Sospecho que debemos adoptarlo de manera más amplia. v4: Jakub informó que v3 rompió la autoprueba de l2_tos_ttl_inherit.sh: solo llame a __vlan_get_protocol() para tipos de VLAN. v2,v3: se abordaron los comentarios de Sabrina sobre v1 y v2 [1] ERROR: KMSAN: valor uninit en geneve_xmit_skb drivers/net/geneve.c:910 [en línea] ERROR: KMSAN: valor uninit en geneve_xmit+0x302d/0x5420 drivers/ net/geneve.c:1030 geneve_xmit_skb drivers/net/geneve.c:910 [en línea] geneve_xmit+0x302d/0x5420 drivers/net/geneve.c:1030 __netdev_start_xmit include/linux/netdevice.h:4903 [en línea] netdev_start_xmit include/ linux/netdevice.h:4917 [en línea] xmit_one net/core/dev.c:3531 [en línea] dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3547 __dev_queue_xmit+0x348d/0x52c0 net/core/dev.c: 4335 dev_queue_xmit include/linux/netdevice.h:3091 [en línea] paquete_xmit+0x9c/0x6c0 net/packet/af_packet.c:276 paquete_snd net/packet/af_packet.c:3081 [en línea] packet_sendmsg+0x8bb0/0x9ef0 net/packet/ af_packet.c:3113 sock_sendmsg_nosec net/socket.c:730 [en línea] __sock_sendmsg+0x30f/0x380 net/socket.c:745 __sys_sendto+0x685/0x830 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [en línea ] __se_sys_sendto net/socket.c:2199 [en línea] __x64_sys_sendto+0x125/0x1d0 net/socket.c:2199 do_syscall_64+0xd5/0x1f0 Entry_SYSCALL_64_after_hwframe+0x6d/0x75 Uninit se creó en slab_post_alloc _hook mm/slub.c:3804 [en línea] slab_alloc_node mm/slub.c:3845 [en línea] kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577 __alloc_skb+0x35b/0x7a0 net/core/skbuff.c: 668 alloc_skb include/linux/skbuff.h:1318 [en línea] alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504 sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795 paquete_alloc_skb net/packet/af_packet.c :2930 [en línea] paquete_snd net/packet/af_packet.c:3024 [en línea] paquete_sendmsg+0x722d/0x9ef0 net/packet/af_packet.c:3113 sock_sendmsg_nosec net/socket.c:730 [en línea] __sock_sendmsg+0x30f/0x380 net/ Socket.c: 745 __sys_sendto+0x685/0x830 net/Socket.c: 2191 __do_sys_sendto net/Socket.c: 2203 [en línea] __se_sys_sendto net/Socket.c: 2199 [Inline] __X64_SYS_SENDTO+0x125/0x1d0 net/Socket/Socket. 2199 do_syscall_64+0xd5/0x1f0 Entry_SYSCALL_64_after_hwframe+0x6d/0x75 CPU: 0 PID: 5033 Comm: syz-executor346 No contaminado 6.9.0-rc1-syzkaller-00005-g928a87efa423 #0 Nombre de hardware: Google Google Compute Engine/Google Motor de cómputo, BIOS Google 29/02/2024"
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