{"cve":"CVE-2026-74520","nvd":{"published":"2026-08-15T13:17:57.210","modified":"2026-10-21T13:19:45.293","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/iommufd: Fix IOPF group ownership UAF\n\niopf_group_alloc() links each last-page IOPF group into the generic IOPF\npending list before invoking the domain fault handler.\niommufd_fault_iopf_handler() also queued an accepted group in the\nIOMMUFD deliver list without removing it from the generic pending list.\n\nWhen detach or HWPT replacement drops the device's IOPF reference count\nto zero, an IOMMU driver may call iopf_queue_remove_device(). That\nfunction responds to and frees groups through the generic pending list\nwithout removing the same groups from IOMMUFD's deliver list or response\nxarray. A later read, response, or cleanup can then access the freed\ngroup and cause a UAF.\n\nFix this by dequeuing an accepted group from the generic pending list\nbefore IOMMUFD queues it for userspace response.\nMake iopf_group_response() send a response regardless of pending-list\nmembership, so the dequeued group can still be completed by IOMMUFD.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8},"cwes":[],"references":["https://git.kernel.org/stable/c/4e74a369236424114b94cf6a9f5ff9e848b430b4","https://git.kernel.org/stable/c/6da8f37419dd4c456f26fc203f04e000186f4b3d","https://git.kernel.org/stable/c/738e6f32e61d80b554e37015ecb7bc620b88001c","https://git.kernel.org/stable/c/8563099bc4b03e1894a983a394225d69b05d9277"],"products":[],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-74520","score":0.00175,"percentile":0.06961,"date":"2026-10-26"},"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."]}