PT-2026-51891 · Linux · Linux
Publicado
2026-06-24
·
Atualizado
2026-06-24
·
CVE-2026-52997
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In the Linux kernel, the following vulnerability has been resolved:
net/sched: sch dualpi2: drain both C-queue and L-queue in dualpi2 change()
Fix dualpi2 change() to correctly enforce updated limit and memlimit
values after a configuration change of the dualpi2 qdisc.
Before this patch, dualpi2 change() always attempted to dequeue packets
via the root qdisc (C-queue) when reducing backlog or memory usage, and
unconditionally assumed that a valid skb will be returned. When traffic
classification results in packets being queued in the L-queue while the
C-queue is empty, this leads to a NULL skb dereference during limit or
memlimit enforcement.
This is fixed by first dequeuing from the C-queue path if it is
non-empty. Once the C-queue is empty, packets are dequeued directly from
the L-queue. Return values from qdisc dequeue internal() are checked for
both queues. When dequeuing from the L-queue, the parent qdisc qlen and
backlog counters are updated explicitly to keep overall qdisc statistics
consistent.
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