CVE-2024-47748
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.
How to fix
- linux linux_kernel5.10.227, 5.15.168, 6.1.113, 6.6.54, 6.10.13, 6.11.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.9 ≤ v < 5.10.227, 5.11 ≤ v < 5.15.168, 5.16 ≤ v < 6.1.113, 6.2 ≤ v < 6.6.54, 6.7 ≤ v < 6.10.13, 6.11 ≤ v < 6.11.2 | 5.10.227, 5.15.168, 6.1.113, 6.6.54, 6.10.13, 6.11.2 |
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