{"id":"CVE-2026-46034","summary":"vfio/cdx: Fix NULL pointer dereference in interrupt trigger path","details":"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.","modified":"2026-06-18T03:54:59.006190210Z","published":"2026-05-27T12:56:43.389Z","related":["openSUSE-SU-2026:10954-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46034.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/51bf7638f33aece41cb3f4cbeb942cc52950e329"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5d6c349c9823eb819fed8b537b088cf38126018c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46034.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46034"},{"type":"PACKAGE","url":"https://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":[{"introduced":"848e447e000c41894ff931dc7c004fd42c8840f8"},{"fixed":"51bf7638f33aece41cb3f4cbeb942cc52950e329"},{"fixed":"5d6c349c9823eb819fed8b537b088cf38126018c"},{"fixed":"338a736aaf15e8ba3635ce20b29af5b8fc15e66a"},{"fixed":"5ea5880764cbb164afb17a62e76ca75dc371409d"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46034.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.10.0"},{"fixed":"6.12.86"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.27"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46034.json"}}],"schema_version":"1.7.5"}