CVE-2026-53079

Summary

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

net_sched: fix skb memory leak in deferred qdisc drops

When the network stack cleans up the deferred list via qdisc_run_end(), it operates on the root qdisc. If the root qdisc do not implement the TCQ_F_DEQUEUE_DROPS flag the packets queue to free are never freed and gets stranded on the child's local to_free list.

Fix this by making qdisc_dequeue_drop() aware of the root qdisc. It fetches the root qdisc and check for the TCQ_F_DEQUEUE_DROPS flag. If the flag is present, the packet is appended directly to the root's to_free list. Otherwise, drop it directly as it was done before the optimization was implemented.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/bf26ad92ffda7884825d67b46bd5efe615c3babf
• https://git.kernel.org/stable/c/a6bd339dbb3514bce690fdcf252e788dfab4ee76

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