CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's handling of Generic Segmentation Offload (GSO) packets within the DualPI2 scheduling mechanism, leading to incorrect backlog accounting. This can result in a NULL pointer dereference in the Queue Fairness Queue (QFQ) scheduler, potentially causing system instability or crashes. System administrators and developers managing Linux environments, particularly those utilizing QFQ, should prioritize addressing this issue to maintain system reliability.
Original NVD Description
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.
Related CVEs
Other vulnerabilities affecting the same vendor(s)