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A vulnerability in the Linux kernel RDMA/iwcm subsystem caused workqueue list corruption due to flawed handling of reusable work items. The issue was introduced by a change to cm_event_handler() that unconditionally called queue_work() under the assumption that already-pending work would not be queued again. In this code path, however, a free list of struct iwcm_work objects was used, with each object embedding a struct work_struct. Because freed and reinitialized work items could be reused from the free list, repeated queue_work() calls could enqueue logically duplicate work as distinct entries. The work handler then walked a separate work_list until empty, allowing an item to be processed and returned to the free list while its corresponding workqueue entry was still pending. If that object was subsequently reinitialized with INIT_WORK and reused, internal workqueue list state could be corrupted, leading to list_del corruption and kernel BUG conditions. The fix removes the redundant work_list and relies on the kernel workqueue subsystem's native tracking.
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A Linux kernel RDMA/iwcm vulnerability involving workqueue list corruption caused by work_list handling.
A Linux kernel vulnerability in RDMA/iwcm involving workqueue list corruption.
A Linux kernel vulnerability in RDMA/iwcm where unconditional queue_work() usage with reused iwcm_work structures can cause workqueue list corruption, leading to kernel BUG/Oops conditions during processing.
A Linux kernel vulnerability in the RDMA/iwcm component caused workqueue list corruption due to incorrect work submission logic and reuse of embedded work_struct entries from a free list, potentially triggering kernel crashes and BUG/Oops conditions under stress.
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