CVE-2026-64207

In the Linux kernel, the following vulnerability has been resolved:

net/sched: dualpi2: fix GSO backlog accounting

When DualPI2 splits a GSO skb into N segments, it propagates N

additional packets to its parent before returning NET_XMIT_SUCCESS.

The parent then accounts for the original skb once more, leaving its

qlen one larger than the number of packets actually queued.

With QFQ as the parent, after all real packets are dequeued, QFQ still

has a non-zero qlen while its in-service aggregate has no active

classes. qfq_choose_next_agg() returns NULL and qfq_dequeue() passes

the result to qfq_peek_skb(), causing a NULL pointer dereference.

Follow the same pattern used by tbf_segment() and taprio: count only

successfully queued segments, propagate the difference between the

original skb and those segments, and return NET_XMIT_SUCCESS whenever

at least one segment was queued.