FKIE_CVE-2024-47748

Vulnerability from fkie_nvd - Published: 2024-10-21 13:15 - Updated: 2025-11-03 23:16
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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(). And such registering and unregistering will only be done if DRIVER_OK is set.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/02e9e9366fefe461719da5d173385b6685f70319Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c170b1e918b9afac25e2bbd01eaa2bfc0ece8c0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7cf2fb51175cafe01df8c43fa15a06194a59c6e2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/927a2580208e0f9b0b47b08f1c802b7233a7ba3cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca64edd7ae93402af2596a952e0d94d545e2b9c0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ec5f1b54ceb23475049ada6e7a43452cf4df88d1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fae9b1776f53aab93ab345bdbf653b991aed717dPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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      "lang": "en",
      "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\u0027t 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\u0027s 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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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: vhost_vdpa: asignar correctamente el token del productor de omisi\u00f3n de irq Sol\u00edamos llamar a irq_bypass_unregister_producer() en vhost_vdpa_setup_vq_irq(), lo cual es problem\u00e1tico ya que no sabemos si el puntero del token sigue siendo v\u00e1lido o no. En realidad, usamos eventfd_ctx como token, por lo que el ciclo de vida del token deber\u00eda estar vinculado a VHOST_SET_VRING_CALL en lugar de a vhost_vdpa_setup_vq_irq(), que podr\u00eda llamarse mediante set_status(). Para solucionar esto, configuramos el token del productor de omisi\u00f3n 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 podr\u00eda haberse liberado en vhost_vring_ioctl(). Y dicho registro y anulaci\u00f3n de registro solo se realizar\u00e1 si DRIVER_OK est\u00e1 configurado."
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  "id": "CVE-2024-47748",
  "lastModified": "2025-11-03T23:16:21.840",
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