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.
References
Configurations
Configuration 1 (hide)
|
History
16 Jun 2026, 16:59
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a - Patch | |
| References | () https://git.kernel.org/stable/c/51bf7638f33aece41cb3f4cbeb942cc52950e329 - Patch | |
| References | () https://git.kernel.org/stable/c/5d6c349c9823eb819fed8b537b088cf38126018c - Patch | |
| References | () https://git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| First Time |
Linux linux Kernel
Linux |
|
| CWE | CWE-476 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
27 May 2026, 14:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-27 14:17
Updated : 2026-06-17 10:52
NVD link : CVE-2026-46034
Mitre link : CVE-2026-46034
CVE.ORG link : CVE-2026-46034
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference