PT-2026-61648 · Linux · Linux
CVE-2026-64207
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Published
2026-07-20
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Updated
2026-07-20
None
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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.
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Related Identifiers
Affected Products
Linux