CVE-2026-46034
- Source
- https://cve.org/CVERecord?id=CVE-2026-46034
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46034.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-46034
- Downstream
- Related
- Published
- 2026-05-27T12:56:43Z
- Modified
- 2026-08-27T18:27:17Z
- Summary
- vfio/cdx: Fix NULL pointer dereference in interrupt trigger path
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46034.json" }- References
-
- https://git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a
- https://git.kernel.org/stable/c/51bf7638f33aece41cb3f4cbeb942cc52950e329
- https://git.kernel.org/stable/c/5d6c349c9823eb819fed8b537b088cf38126018c
- https://git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46034.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-46034
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced848e447e000c41894ff931dc7c004fd42c8840f8Fixed51bf7638f33aece41cb3f4cbeb942cc52950e329Fixed5d6c349c9823eb819fed8b537b088cf38126018cFixed338a736aaf15e8ba3635ce20b29af5b8fc15e66aFixed5ea5880764cbb164afb17a62e76ca75dc371409d