CVE-2024-47748

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/02e9e9366fefe461719da5d173385b6685f70319 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/02e9e9366fefe461719da5d173385b6685f70319Patch
• https://git.kernel.org/stable/c/0c170b1e918b9afac25e2bbd01eaa2bfc0ece8c0Patch
• https://git.kernel.org/stable/c/7cf2fb51175cafe01df8c43fa15a06194a59c6e2Patch
• https://git.kernel.org/stable/c/927a2580208e0f9b0b47b08f1c802b7233a7ba3cPatch
• https://git.kernel.org/stable/c/ca64edd7ae93402af2596a952e0d94d545e2b9c0Patch
• https://git.kernel.org/stable/c/ec5f1b54ceb23475049ada6e7a43452cf4df88d1Patch
• https://git.kernel.org/stable/c/fae9b1776f53aab93ab345bdbf653b991aed717dPatch
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html