CVE-2024-47748: vhost_vdpa: assign irq bypass producer token correctly
First published: Mon Oct 21 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.9<5.10.227 | |
| Linux Kernel | >=5.11<5.15.168 | |
| Linux Kernel | >=5.16<6.1.113 | |
| Linux Kernel | >=6.2<6.6.54 | |
| Linux Kernel | >=6.7<6.10.13 | |
| Linux Kernel | >=6.11<6.11.2 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/02e9e9366fefe461719da5d173385b6685f70319
- https://git.kernel.org/stable/c/0c170b1e918b9afac25e2bbd01eaa2bfc0ece8c0
- https://git.kernel.org/stable/c/7cf2fb51175cafe01df8c43fa15a06194a59c6e2
- https://git.kernel.org/stable/c/927a2580208e0f9b0b47b08f1c802b7233a7ba3c
- https://git.kernel.org/stable/c/ca64edd7ae93402af2596a952e0d94d545e2b9c0
- https://git.kernel.org/stable/c/ec5f1b54ceb23475049ada6e7a43452cf4df88d1
- https://git.kernel.org/stable/c/fae9b1776f53aab93ab345bdbf653b991aed717d
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-47748
- https://nvd.nist.gov/vuln/detail/CVE-2024-47748
- https://launchpad.net/bugs/cve/CVE-2024-47748
- https://security-tracker.debian.org/tracker/CVE-2024-47748
- https://ubuntu.com/security/CVE-2024-47748
- https://git.kernel.org/linus/02e9e9366fefe461719da5d173385b6685f70319
Frequently Asked Questions
What is the severity of CVE-2024-47748?
CVE-2024-47748 has a severity rating that underscores its importance for system security in the Linux kernel.
How do I fix CVE-2024-47748?
To fix CVE-2024-47748, upgrade your Linux kernel to one of the remedied versions such as 6.1.123-1 or 6.1.119-1.
Which Linux kernel versions are affected by CVE-2024-47748?
CVE-2024-47748 affects various versions of the Linux kernel prior to the patched releases mentioned.
What components are impacted by CVE-2024-47748?
CVE-2024-47748 primarily impacts the vhost_vdpa component within the Linux kernel.
Is CVE-2024-47748 specific to any distribution of Linux?
Yes, CVE-2024-47748 has been noted in the Debian version of the Linux kernel and may also affect other distributions that utilize affected kernel versions.
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