CVE-2026-99268 is a vulnerability in the Linux kernel's io_uring subsystem related to waking ring pollers for local task work. The issue involves the handling of deferred completions (IORING_SETUP_DEFER_TASKRUN) where local work completions are queued but may not properly wake tasks waiting on poll or epoll, potentially causing delays in processing completion queue events. The fix involves waking the poll wait queue when the first entry is added to the work list, using an RCU callback to avoid locking issues.