CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's RDMA subsystem, specifically in the handling of completion queues (CQs) where a potential use-after-free condition could occur. This flaw may allow unauthorized access to freed memory, potentially leading to system instability or exploitation. Organizations utilizing RDMA in their Linux environments should prioritize addressing this issue to mitigate risks associated with memory management vulnerabilities.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix potential use after free in ib_free_cq() When accessing a CQ via the netlink path the only synchronization mechanism for the said CQ is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of ib_free_cq(), which is too late, since by that point vendor-specific resources associated with the CQ might already be freed. This can leave a short window where the CQ remains accessible through restrack, leading to a potential use-after-free. Fix this by moving the rdma_restrack_del() call to be before the freeing of the vendor-specific resources ensuring that the CQ is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a CQ that is in the process of destruction.