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CVE-2026-45845 is a NULL pointer dereference in the Linux kernel's TAPRIO traffic scheduler (net/sched/sch_taprio.c). When a TAPRIO child qdisc is removed via RTM_DELQDISC, taprio_graft() can be invoked with new == NULL and stores NULL in q->qdiscs[cl - 1]. Later, RTM_GETTCLASS dump operations iterate classes through taprio_walk() and call taprio_dump_class(), which obtains the child via taprio_leaf() and dereferences child->handle without ensuring the pointer is non-NULL. This results in a kernel NULL pointer dereference during class dump handling. The fix replaces NULL children with &noop_qdisc in taprio_graft(), aligning with common qdisc handling patterns, and updates enqueue/dequeue logic to test for &noop_qdisc instead of NULL.
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