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.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Ubuntu | — | Upgrade linux-image-oem-26.04Upgrade linux-image-oem-26.04aUpgrade linux-image-aws-7.0Upgrade linux-image-realtime-7.0Upgrade linux-image-generic-64kUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-nvidia-bosUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-aws-64k-7.0Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-nvidia-7.0Upgrade linux-image-nvidiaUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-gke-64k-7.0Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-azureUpgrade linux-image-gcp-64kUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-generic-7.0Upgrade linux-image-gke-7.0Upgrade linux-image-oem-7.0Upgrade linux-image-realtime-64kUpgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-ibm-7.0Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-7.0.0-1012-awsUpgrade linux-image-gke-64kUpgrade linux-image-raspiUpgrade linux-image-awsUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-genericUpgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-virtual-7.0Upgrade linux-image-7.0.0-1013-oemUpgrade linux-image-raspi-realtimeUpgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-31-genericUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-raspi-7.0Upgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-oracle-7.0Upgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-generic-64k-7.0Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oracleUpgrade linux-image-ibmUpgrade linux-image-gcpUpgrade linux-image-azure-7.0Upgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-nvidia-64kUpgrade linux-image-aws-64kUpgrade linux-image-oem-26.04bUpgrade linux-image-virtualUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-oracle-64kUpgrade linux-image-realtimeUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-gkeUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-azure-lts-26.04 | Sep 14, 2026 | Sep 7, 2026 |
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