vfio/cdx: Fix NULL pointer dereference in interrupt trigger path

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Summary

CVECVE-2026-46034
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:22 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.048460000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 848e447e000c41894ff931dc7c004fd42c8840f8 51bf7638f33aece41cb3f4cbeb942cc52950e329 git Not specified
CNA Linux Linux affected 848e447e000c41894ff931dc7c004fd42c8840f8 5d6c349c9823eb819fed8b537b088cf38126018c git Not specified
CNA Linux Linux affected 848e447e000c41894ff931dc7c004fd42c8840f8 338a736aaf15e8ba3635ce20b29af5b8fc15e66a git Not specified
CNA Linux Linux affected 848e447e000c41894ff931dc7c004fd42c8840f8 5ea5880764cbb164afb17a62e76ca75dc371409d git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.86 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/51bf7638f33aece41cb3f4cbeb942cc52950e329 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d6c349c9823eb819fed8b537b088cf38126018c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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