In the Linux kernel, the following vulnerability has been resolved:
vfio/cdx: Fix NULL pointer dereference in interrupt trigger path
Add validation to ensure MSI is configured before accessing cdx_irqs array in vfio_cdx_set_msi_trigger(). Without this check, userspace can trigger a NULL pointer dereference by calling VFIO_DEVICE_SET_IRQS with VFIO_IRQ_SET_DATA_BOOL or VFIO_IRQ_SET_DATA_NONE flags before ever setting up interrupts via VFIO_IRQ_SET_DATA_EVENTFD.
The vfio_cdx_msi_enable() function allocates the cdx_irqs array and sets config_msi to 1 only when called through the EVENTFD path. The trigger loop (for DATA_BOOL/DATA_NONE) assumed this had already been done, but there was no enforcement of this call ordering.
This matches the protection used in the PCI VFIO driver where vfio_pci_set_msi_trigger() checks irq_is() before the trigger loop.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Ubuntu | — | Upgrade linux-image-7.0.0-1008-awsUpgrade linux-image-7.0.0-1013-nvidiaUpgrade linux-image-7.0.0-27-generic-64kUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-7.0.0-1008-oemUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-24.04aUpgrade linux-image-raspi-realtimeUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-ibmUpgrade linux-image-oem-24.04cUpgrade linux-image-oracleUpgrade linux-image-azure-7.0Upgrade linux-image-awsUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-7.0.0-28-genericUpgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-nvidia-64kUpgrade linux-image-raspiUpgrade linux-image-7.0.0-27-genericUpgrade linux-image-oem-26.04Upgrade linux-image-realtimeUpgrade linux-image-7.0.0-27-realtimeUpgrade linux-image-oem-24.04dUpgrade linux-image-azureUpgrade linux-image-generic-7.0Upgrade linux-image-azure-fdeUpgrade linux-image-7.0.0-1014-raspiUpgrade linux-image-gcpUpgrade linux-image-oracle-64kUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-realtime-64kUpgrade linux-image-oem-7.0Upgrade linux-image-7.0.0-1007-gcpUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-nvidia-7.0Upgrade linux-image-oracle-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-7.0.0-1007-oracle-64kUpgrade linux-image-7.0.0-1007-oracleUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-virtual-7.0Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-gcp-7.0Upgrade linux-image-realtime-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-gcp-64kUpgrade linux-image-azure-fde-7.0Upgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-27-realtime-64kUpgrade linux-image-7.0.0-1014-raspi-realtimeUpgrade linux-image-7.0.0-1007-gcp-64kUpgrade linux-image-generic-64kUpgrade linux-image-aws-64kUpgrade linux-image-7.0.0-28-generic-64kUpgrade linux-image-7.0.0-1010-azureUpgrade linux-image-7.0.0-1009-ibmUpgrade linux-image-oem-24.04bUpgrade linux-image-7.0.0-1013-nvidia-64kUpgrade linux-image-oem-26.04aUpgrade linux-image-ibm-7.0Upgrade linux-image-virtualUpgrade linux-image-7.0.0-1008-aws-64kUpgrade linux-image-oem-24.04Upgrade linux-image-aws-64k-7.0Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-genericUpgrade linux-image-generic-64k-7.0Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-nvidia | Jul 1, 2026 | May 27, 2026 |
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