Description

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.

Classification

CVE ID: CVE-2024-47748

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 8.03% (scored less or equal to compared to others)

EPSS Date: 2025-05-04 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: none

SSVC Technical Impact: partial

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2024-47748
https://git.kernel.org/stable/c/0c170b1e918b9afac25e2bbd01eaa2bfc0ece8c0
https://git.kernel.org/stable/c/927a2580208e0f9b0b47b08f1c802b7233a7ba3c
https://git.kernel.org/stable/c/ec5f1b54ceb23475049ada6e7a43452cf4df88d1
https://git.kernel.org/stable/c/ca64edd7ae93402af2596a952e0d94d545e2b9c0
https://git.kernel.org/stable/c/fae9b1776f53aab93ab345bdbf653b991aed717d
https://git.kernel.org/stable/c/7cf2fb51175cafe01df8c43fa15a06194a59c6e2
https://git.kernel.org/stable/c/02e9e9366fefe461719da5d173385b6685f70319

Timeline