low
1
Advisory Published
CVE Published
Updated

CVE-2024-26812: vfio/pci: Create persistent INTx handler

First published: Fri Apr 05 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Create persistent INTx handler A vulnerability exists where the eventfd for INTx signaling can be deconfigured, which unregisters the IRQ handler but still allows eventfds to be signaled with a NULL context through the SET_IRQS ioctl or through unmask irqfd if the device interrupt is pending. Ideally this could be solved with some additional locking; the igate mutex serializes the ioctl and config space accesses, and the interrupt handler is unregistered relative to the trigger, but the irqfd path runs asynchronous to those. The igate mutex cannot be acquired from the atomic context of the eventfd wake function. Disabling the irqfd relative to the eventfd registration is potentially incompatible with existing userspace. As a result, the solution implemented here moves configuration of the INTx interrupt handler to track the lifetime of the INTx context object and irq_type configuration, rather than registration of a particular trigger eventfd. Synchronization is added between the ioctl path and eventfd_signal() wrapper such that the eventfd trigger can be dynamically updated relative to in-flight interrupts or irqfd callbacks.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
redhat/kernel<6.1.84
6.1.84
redhat/kernel<6.6.24
6.6.24
redhat/kernel<6.7.12
6.7.12
redhat/kernel<6.8.3
6.8.3
redhat/kernel<6.9
6.9
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.119-1
6.12.11-1
6.12.12-1

Remedy

https://git.kernel.org/linus/89e1f7d4c66d85f42c3d52ea3866eb10cadf6153

Remedy

https://git.kernel.org/linus/18c198c96a815c962adc2b9b77909eec0be7df4d

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-26812?

    CVE-2024-26812 has been classified as a medium severity vulnerability in the Linux kernel.

  • How do I fix CVE-2024-26812?

    To remediate CVE-2024-26812, update your Linux kernel to versions 6.1.84 or newer, or 5.10.223-1 or newer for Debian systems.

  • What impact does CVE-2024-26812 have on system security?

    CVE-2024-26812 can lead to deregistration of the IRQ handler while allowing signaling, which may result in unexpected behavior or privilege escalation.

  • Which Linux kernel versions are affected by CVE-2024-26812?

    CVE-2024-26812 affects multiple kernel versions prior to 6.1.84, 6.6.24, 6.7.12, 6.8.3, and 6.9.

  • Is CVE-2024-26812 present in earlier Debian kernels?

    Yes, CVE-2024-26812 is present in earlier Debian kernels before the fixed versions 5.10.223-1 and 6.1.123-1.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203