{"cve":"CVE-2026-46034","nvd":{"published":"2026-05-27T14:17:22.463","modified":"2026-06-17T10:52:56.280","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/cdx: Fix NULL pointer dereference in interrupt trigger path\n\nAdd validation to ensure MSI is configured before accessing cdx_irqs\narray in vfio_cdx_set_msi_trigger(). Without this check, userspace\ncan trigger a NULL pointer dereference by calling VFIO_DEVICE_SET_IRQS\nwith VFIO_IRQ_SET_DATA_BOOL or VFIO_IRQ_SET_DATA_NONE flags before\never setting up interrupts via VFIO_IRQ_SET_DATA_EVENTFD.\n\nThe vfio_cdx_msi_enable() function allocates the cdx_irqs array and\nsets config_msi to 1 only when called through the EVENTFD path. The\ntrigger loop (for DATA_BOOL/DATA_NONE) assumed this had already been\ndone, but there was no enforcement of this call ordering.\n\nThis matches the protection used in the PCI VFIO driver where\nvfio_pci_set_msi_trigger() checks irq_is() before the trigger loop.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"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"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-46034","score":0.00135,"percentile":0.02972,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}