{"id":"CVE-2026-46034","state":"PUBLISHED","title":"vfio/cdx: Fix NULL pointer dereference in interrupt trigger path","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.","publishedAt":"2026-05-27T12:56:43.389Z","updatedAt":"2026-06-14T17:49:29.082Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"848e447e000c41894ff931dc7c004fd42c8840f8","status":"affected","lessThan":"51bf7638f33aece41cb3f4cbeb942cc52950e329","versionType":"git"},{"version":"848e447e000c41894ff931dc7c004fd42c8840f8","status":"affected","lessThan":"5d6c349c9823eb819fed8b537b088cf38126018c","versionType":"git"},{"version":"848e447e000c41894ff931dc7c004fd42c8840f8","status":"affected","lessThan":"338a736aaf15e8ba3635ce20b29af5b8fc15e66a","versionType":"git"},{"version":"848e447e000c41894ff931dc7c004fd42c8840f8","status":"affected","lessThan":"5ea5880764cbb164afb17a62e76ca75dc371409d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/cdx/intr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.12.86","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.27","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/cdx/intr.c"]}],"references":["https://git.kernel.org/stable/c/51bf7638f33aece41cb3f4cbeb942cc52950e329","https://git.kernel.org/stable/c/5d6c349c9823eb819fed8b537b088cf38126018c","https://git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a","https://git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46034.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46034","state":"PUBLISHED","datePublished":"2026-05-27T12:56:43.389Z","dateUpdated":"2026-06-14T17:49:29.082Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.093Z"},"containers":{"cna":{"title":"vfio/cdx: Fix NULL pointer dereference in interrupt trigger path","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"848e447e000c41894ff931dc7c004fd42c8840f8","status":"affected","lessThan":"51bf7638f33aece41cb3f4cbeb942cc52950e329","versionType":"git"},{"version":"848e447e000c41894ff931dc7c004fd42c8840f8","status":"affected","lessThan":"5d6c349c9823eb819fed8b537b088cf38126018c","versionType":"git"},{"version":"848e447e000c41894ff931dc7c004fd42c8840f8","status":"affected","lessThan":"338a736aaf15e8ba3635ce20b29af5b8fc15e66a","versionType":"git"},{"version":"848e447e000c41894ff931dc7c004fd42c8840f8","status":"affected","lessThan":"5ea5880764cbb164afb17a62e76ca75dc371409d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/cdx/intr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.12.86","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.27","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vfio/cdx/intr.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/51bf7638f33aece41cb3f4cbeb942cc52950e329"},{"url":"https://git.kernel.org/stable/c/5d6c349c9823eb819fed8b537b088cf38126018c"},{"url":"https://git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a"},{"url":"https://git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-14T17:49:29.082Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.12.86"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.18.27"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.0.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}