CVE-2022-49788
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
misc/vmw_vmci: fix an infoleak in vmci_host_do_receive_datagram()
`struct vmci_event_qp` allocated by qp_notify_peer() contains padding, which may carry uninitialized data to the userspace, as observed by KMSAN:
Use memset() to prevent the infoleaks.
Also speculatively fix qp_notify_peer_local(), which may suffer from the same problem.
Detalles técnicos trazas, registros y código del informe original
BUG: KMSAN: kernel-infoleak in instrument_copy_to_user ./include/linux/instrumented.h:121 instrument_copy_to_user ./include/linux/instrumented.h:121 _copy_to_user+0x5f/0xb0 lib/usercopy.c:33 copy_to_user ./include/linux/uaccess.h:169 vmci_host_do_receive_datagram drivers/misc/vmw_vmci/vmci_host.c:431 vmci_host_unlocked_ioctl+0x33d/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:925 vfs_ioctl fs/ioctl.c:51 ... Uninit was stored to memory at: kmemdup+0x74/0xb0 mm/util.c:131 dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:271 vmci_datagram_dispatch+0x4f8/0xfc0 drivers/misc/vmw_vmci/vmci_datagram.c:339 qp_notify_peer+0x19a/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1479 qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662 qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750 vmci_qp_broker_alloc+0x96/0xd0 drivers/misc/vmw_vmci/vmci_queue_pair.c:1940 vmci_host_do_alloc_queuepair drivers/misc/vmw_vmci/vmci_host.c:488 vmci_host_unlocked_ioctl+0x24fd/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:927 ... Local variable ev created at: qp_notify_peer+0x54/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1456 qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662 qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750 Bytes 28-31 of 48 are uninitialized Memory access of size 48 starts at ffff888035155e00 Data copied to user address 0000000020000100
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: 5/10/2026
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 (1)
CWE
- CWE-908
Referencias
- https://git.kernel.org/stable/c/5a275528025ae4bc7e2232866856dfebf84b2fad
- https://git.kernel.org/stable/c/62634b43d3c4e1bf62fd540196f7081bf0885c0a
- https://git.kernel.org/stable/c/76c50d77b928a33e5290aaa9fdc10e88254ff8c7
- https://git.kernel.org/stable/c/7ccf7229b96fadc3a185d1391f814a604c7ef609
- https://git.kernel.org/stable/c/8e2f33c598370bcf828bab4d667d1d38bcd3c57d
- https://git.kernel.org/stable/c/e5b0d06d9b10f5f43101bd6598b076c347f9295f
- https://git.kernel.org/stable/c/e7061dd1fef2dfb6458cd521aef27aa66f510d31
- https://git.kernel.org/stable/c/f04586c2315cfd03d72ad0395705435e7ed07b1a
JSON original (NVD)
Mostrar
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc/vmw_vmci: fix an infoleak in vmci_host_do_receive_datagram()\n\n`struct vmci_event_qp` allocated by qp_notify_peer() contains padding,\nwhich may carry uninitialized data to the userspace, as observed by\nKMSAN:\n\n BUG: KMSAN: kernel-infoleak in instrument_copy_to_user ./include/linux/instrumented.h:121\n instrument_copy_to_user ./include/linux/instrumented.h:121\n _copy_to_user+0x5f/0xb0 lib/usercopy.c:33\n copy_to_user ./include/linux/uaccess.h:169\n vmci_host_do_receive_datagram drivers/misc/vmw_vmci/vmci_host.c:431\n vmci_host_unlocked_ioctl+0x33d/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:925\n vfs_ioctl fs/ioctl.c:51\n ...\n\n Uninit was stored to memory at:\n kmemdup+0x74/0xb0 mm/util.c:131\n dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:271\n vmci_datagram_dispatch+0x4f8/0xfc0 drivers/misc/vmw_vmci/vmci_datagram.c:339\n qp_notify_peer+0x19a/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1479\n qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662\n qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750\n vmci_qp_broker_alloc+0x96/0xd0 drivers/misc/vmw_vmci/vmci_queue_pair.c:1940\n vmci_host_do_alloc_queuepair drivers/misc/vmw_vmci/vmci_host.c:488\n vmci_host_unlocked_ioctl+0x24fd/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:927\n ...\n\n Local variable ev created at:\n qp_notify_peer+0x54/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1456\n qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662\n qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750\n\n Bytes 28-31 of 48 are uninitialized\n Memory access of size 48 starts at ffff888035155e00\n Data copied to user address 0000000020000100\n\nUse memset() to prevent the infoleaks.\n\nAlso speculatively fix qp_notify_peer_local(), which may suffer from the\nsame problem."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: misc/vmw_vmci: se corrige una fuga de información en vmci_host_do_receive_datagram() `struct vmci_event_qp` asignado por qp_notify_peer() que contiene relleno, que puede llevar datos no inicializados al espacio de usuario, como lo observó KMSAN: ERROR: KMSAN: fuga de información del kernel en instrument_copy_to_user ./include/linux/instrumented.h:121 instrument_copy_to_user ./include/linux/instrumented.h:121 _copy_to_user+0x5f/0xb0 lib/usercopy.c:33 copy_to_user ./include/linux/uaccess.h:169 vmci_host_do_receive_datagram drivers/misc/vmw_vmci/vmci_host.c:431 vmci_host_unlocked_ioctl+0x33d/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:925 vfs_ioctl fs/ioctl.c:51 ... Uninit se almacenó en la memoria en: kmemdup+0x74/0xb0 mm/util.c:131 dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:271 vmci_datagram_dispatch+0x4f8/0xfc0 drivers/misc/vmw_vmci/vmci_datagram.c:339 qp_notify_peer+0x19a/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1479 qp_broker_attach controladores/misc/vmw_vmci/vmci_queue_pair.c:1662 qp_broker_alloc+0x2977/0x2f30 controladores/misc/vmw_vmci/vmci_queue_pair.c:1750 vmci_qp_broker_alloc+0x96/0xd0 controladores/misc/vmw_vmci/vmci_queue_pair.c:1940 vmci_host_do_alloc_queuepair controladores/misc/vmw_vmci/vmci_host.c:488 vmci_host_unlocked_ioctl+0x24fd/0x43d0 controladores/misc/vmw_vmci/vmci_host.c:927 ... Variable local ev creada en: qp_notify_peer+0x54/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1456 qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662 qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750 Bytes 28-31 de 48 sin inicializar. El acceso a memoria de tamaño 48 comienza en ffff888035155e00. Datos copiados a la dirección de usuario 0000000020000100. Use memset() para evitar las filtraciones de información. También se especula que se debe corregir qp_notify_peer_local(), que podría presentar el mismo problema."
}
],
"lastModified": "2026-06-17T05:19:08.930",
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