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THREATINT
PUBLISHED

CVE-2024-47748

vhost_vdpa: assign irq bypass producer token correctly



AssignerLinux
Reserved2024-09-30
Published2024-10-21
Updated2024-11-05

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.

Product status

Default status
unaffected

2cf1ba9a4d15 before 0c170b1e918b
affected

2cf1ba9a4d15 before 927a2580208e
affected

2cf1ba9a4d15 before ec5f1b54ceb2
affected

2cf1ba9a4d15 before ca64edd7ae93
affected

2cf1ba9a4d15 before fae9b1776f53
affected

2cf1ba9a4d15 before 7cf2fb51175c
affected

2cf1ba9a4d15 before 02e9e9366fef
affected

Default status
affected

5.9
affected

Any version before 5.9
unaffected

5.10.227
unaffected

5.15.168
unaffected

6.1.113
unaffected

6.6.54
unaffected

6.10.13
unaffected

6.11.2
unaffected

6.12-rc1
unaffected

References

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

cve.org CVE-2024-47748

nvd.nist.gov CVE-2024-47748

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