Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 848e447e000c41894ff931dc7c004fd42c8840f8 before 51bf7638f33aece41cb3f4cbeb942cc52950e329; affected 848e447e000c41894ff931dc7c004fd42c8840f8 before 5d6c349c9823eb819fed8b537b088cf38126018c; affected 848e447e000c41894ff931dc7c004fd42c8840f8 before 338a736aaf15e8ba3635ce20b29af5b8fc15e66a; affected 848e447e000c41894ff931dc7c004fd42c8840f8 before 5ea5880764cbb164afb17a62e76ca75dc371409d |
| Linux / Linux | affected 6.10; unaffected 0 before 6.10; unaffected 6.12.86 through 6.12.*; unaffected 6.18.27 through 6.18.*; unaffected 7.0.4 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.