CVE-2024-35944
Estado: ModificadaMedia (5.5)—
Detalles técnicos trazas, registros y código del informe original
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: VMCI: corrigió la advertencia de tiempo de ejecución de memcpy() en dg_dispatch_as_host() Syzkaller presionó el error 'ADVERTENCIA en dg_dispatch_as_host'. memcpy: se detectó escritura que abarca todos los campos (tamaño 56) de un solo campo "&dg_info->msg" en drivers/misc/vmw_vmci/vmci_datagram.c:237 (tamaño 24) ADVERTENCIA: CPU: 0 PID: 1555 en drivers/misc/vmw_vmci /vmci_datagram.c:237 dg_dispatch_as_host+0x88e/0xa60 drivers/misc/vmw_vmci/vmci_datagram.c:237 Algunos comentarios de código, según tengo entendido: 544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)->payload_size ) /// Esto es 24 + payload_size memcpy(&dg_info->msg, dg, dg_size); Destino = dg_info->msg ---> esta es una estructura de 24 bytes (struct vmci_datagram) Fuente = dg --> esta es una estructura de 24 bytes (struct vmci_datagram) Tamaño = dg_size = 24 + payload_size {payload_size = 56-24 = 32} -- Syzkaller logró establecer payload_size en 32. 35 struct delay_datagram_info { 36 struct datagram_entry *entry; 37 struct work_struct work; 38 bool in_dg_host_queue; 39 /* msg y msg_payload deben estar juntos. */ 40 struct vmci_datagram mensaje; 41 u8 msg_payload[]; 42}; Entonces, esos bytes adicionales de payload se copian en msg_payload[], se ve una advertencia de tiempo de ejecución mientras se utiliza Syzkaller. Una forma posible de solucionar la advertencia es dividir memcpy() en dos partes: una, asignación directa del mensaje y la segunda, encargada del payload. Gustavo citó: "Bajo FORTIFY_SOURCE no debemos copiar datos entre varios miembros de una estructura".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: 0.23%
- Percentil entre todas las CVEs puntuadas: 13
- 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
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74
- https://git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ec
- https://git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866f
- https://git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100
- https://git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73
- https://git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051
- https://git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624b
- https://git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75
- https://git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74
- https://git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ec
- https://git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866f
- https://git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100
- https://git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73
- https://git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051
- https://git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624b
- https://git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75
- 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-398330.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nVMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()\n\nSyzkaller hit 'WARNING in dg_dispatch_as_host' bug.\n\nmemcpy: detected field-spanning write (size 56) of single field \"&dg_info->msg\"\nat drivers/misc/vmw_vmci/vmci_datagram.c:237 (size 24)\n\nWARNING: CPU: 0 PID: 1555 at drivers/misc/vmw_vmci/vmci_datagram.c:237\ndg_dispatch_as_host+0x88e/0xa60 drivers/misc/vmw_vmci/vmci_datagram.c:237\n\nSome code commentry, based on my understanding:\n\n544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)->payload_size)\n/// This is 24 + payload_size\n\nmemcpy(&dg_info->msg, dg, dg_size);\n\tDestination = dg_info->msg ---> this is a 24 byte\n\t\t\t\t\tstructure(struct vmci_datagram)\n\tSource = dg --> this is a 24 byte structure (struct vmci_datagram)\n\tSize = dg_size = 24 + payload_size\n\n{payload_size = 56-24 =32} -- Syzkaller managed to set payload_size to 32.\n\n 35 struct delayed_datagram_info {\n 36 struct datagram_entry *entry;\n 37 struct work_struct work;\n 38 bool in_dg_host_queue;\n 39 /* msg and msg_payload must be together. */\n 40 struct vmci_datagram msg;\n 41 u8 msg_payload[];\n 42 };\n\nSo those extra bytes of payload are copied into msg_payload[], a run time\nwarning is seen while fuzzing with Syzkaller.\n\nOne possible way to fix the warning is to split the memcpy() into\ntwo parts -- one -- direct assignment of msg and second taking care of payload.\n\nGustavo quoted:\n\"Under FORTIFY_SOURCE we should not copy data across multiple members\nin a structure.\""
},
{
"lang": "es",
"value": "En el kernel de Linux, se resolvió la siguiente vulnerabilidad: VMCI: corrigió la advertencia de tiempo de ejecución de memcpy() en dg_dispatch_as_host() Syzkaller presionó el error 'ADVERTENCIA en dg_dispatch_as_host'. memcpy: se detectó escritura que abarca todos los campos (tamaño 56) de un solo campo \"&dg_info->msg\" en drivers/misc/vmw_vmci/vmci_datagram.c:237 (tamaño 24) ADVERTENCIA: CPU: 0 PID: 1555 en drivers/misc/vmw_vmci /vmci_datagram.c:237 dg_dispatch_as_host+0x88e/0xa60 drivers/misc/vmw_vmci/vmci_datagram.c:237 Algunos comentarios de código, según tengo entendido: 544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)->payload_size ) /// Esto es 24 + payload_size memcpy(&dg_info->msg, dg, dg_size); Destino = dg_info->msg ---> esta es una estructura de 24 bytes (struct vmci_datagram) Fuente = dg --> esta es una estructura de 24 bytes (struct vmci_datagram) Tamaño = dg_size = 24 + payload_size {payload_size = 56-24 = 32} -- Syzkaller logró establecer payload_size en 32. 35 struct delay_datagram_info { 36 struct datagram_entry *entry; 37 struct work_struct work; 38 bool in_dg_host_queue; 39 /* msg y msg_payload deben estar juntos. */ 40 struct vmci_datagram mensaje; 41 u8 msg_payload[]; 42}; Entonces, esos bytes adicionales de payload se copian en msg_payload[], se ve una advertencia de tiempo de ejecución mientras se utiliza Syzkaller. Una forma posible de solucionar la advertencia es dividir memcpy() en dos partes: una, asignación directa del mensaje y la segunda, encargada del payload. Gustavo citó: \"Bajo FORTIFY_SOURCE no debemos copiar datos entre varios miembros de una estructura\"."
}
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"lastModified": "2026-06-17T07:35:46.593",
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"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}