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CVE-2024-47748

Estado: ModificadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

vhost_vdpa: assign irq bypass producer token correctly

We used to call irq_bypass_unregister_producer() in vhost_vdpa_setup_vq_irq() which is problematic as we don't know if the token pointer is still valid or not.

Actually, we use the eventfd_ctx as the token so the life cycle of the token should be bound to the VHOST_SET_VRING_CALL instead of vhost_vdpa_setup_vq_irq() which could be called by set_status().

Fixing this by setting up irq bypass producer's token when handling VHOST_SET_VRING_CALL and un-registering the producer before calling vhost_vring_ioctl() to prevent a possible use after free as eventfd could have been released in vhost_vring_ioctl().

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And such registering and unregistering will only be done if DRIVER_OK is set.

CVSS

Probabilidad de explotación (EPSS)

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de use-after-free (CWE-416) en kernel Linux con acceso local (AV:L) y privilegios limitados (PR:L) permite ejecutar código con contexto del proceso, causando ejecución de comandos y escalada de privilegios.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost_vdpa: assign irq bypass producer token correctly\n\nWe used to call irq_bypass_unregister_producer() in\nvhost_vdpa_setup_vq_irq() which is problematic as we don't know if the\ntoken pointer is still valid or not.\n\nActually, we use the eventfd_ctx as the token so the life cycle of the\ntoken should be bound to the VHOST_SET_VRING_CALL instead of\nvhost_vdpa_setup_vq_irq() which could be called by set_status().\n\nFixing this by setting up irq bypass producer's token when handling\nVHOST_SET_VRING_CALL and un-registering the producer before calling\nvhost_vring_ioctl() to prevent a possible use after free as eventfd\ncould have been released in vhost_vring_ioctl(). And such registering\nand unregistering will only be done if DRIVER_OK is set."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: vhost_vdpa: asignar correctamente el token del productor de omisión de irq Solíamos llamar a irq_bypass_unregister_producer() en vhost_vdpa_setup_vq_irq(), lo cual es problemático ya que no sabemos si el puntero del token sigue siendo válido o no. En realidad, usamos eventfd_ctx como token, por lo que el ciclo de vida del token debería estar vinculado a VHOST_SET_VRING_CALL en lugar de a vhost_vdpa_setup_vq_irq(), que podría llamarse mediante set_status(). Para solucionar esto, configuramos el token del productor de omisión de irq al manejar VHOST_SET_VRING_CALL y anulamos el registro del productor antes de llamar a vhost_vring_ioctl() para evitar un posible use after free, ya que eventfd podría haberse liberado en vhost_vring_ioctl(). Y dicho registro y anulación de registro solo se realizará si DRIVER_OK está configurado."
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