CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's IOMMU subsystem, specifically related to the handling of IOPF group ownership, which can lead to a use-after-free (UAF) condition. This flaw allows an attacker to potentially access freed memory, leading to undefined behavior or system crashes. Organizations using Linux in environments that rely on IOMMU for device virtualization or memory management should prioritize addressing this issue to maintain system stability and security.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: iommu/iommufd: Fix IOPF group ownership UAF iopf_group_alloc() links each last-page IOPF group into the generic IOPF pending list before invoking the domain fault handler. iommufd_fault_iopf_handler() also queued an accepted group in the IOMMUFD deliver list without removing it from the generic pending list. When detach or HWPT replacement drops the device's IOPF reference count to zero, an IOMMU driver may call iopf_queue_remove_device(). That function responds to and frees groups through the generic pending list without removing the same groups from IOMMUFD's deliver list or response xarray. A later read, response, or cleanup can then access the freed group and cause a UAF. Fix this by dequeuing an accepted group from the generic pending list before IOMMUFD queues it for userspace response. Make iopf_group_response() send a response regardless of pending-list membership, so the dequeued group can still be completed by IOMMUFD.