CVE-2024-47748

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.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/02e9e9366fefe461719da5d173385b6685f70319	Patch
https://git.kernel.org/stable/c/0c170b1e918b9afac25e2bbd01eaa2bfc0ece8c0	Patch
https://git.kernel.org/stable/c/7cf2fb51175cafe01df8c43fa15a06194a59c6e2	Patch
https://git.kernel.org/stable/c/927a2580208e0f9b0b47b08f1c802b7233a7ba3c	Patch
https://git.kernel.org/stable/c/ca64edd7ae93402af2596a952e0d94d545e2b9c0	Patch
https://git.kernel.org/stable/c/ec5f1b54ceb23475049ada6e7a43452cf4df88d1	Patch
https://git.kernel.org/stable/c/fae9b1776f53aab93ab345bdbf653b991aed717d	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

No history.

Information

Published : 2024-10-21 13:15

Updated : 2024-10-23 17:28

NVD link : CVE-2024-47748

Mitre link : CVE-2024-47748

CVE.ORG link : CVE-2024-47748

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-416

Use After Free

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And such registering\nand unregistering will only be done if DRIVER_OK is set."}, {"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(). 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