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Unrated severityNVD Advisory· Published Sep 12, 2023· Updated Feb 25, 2026

Use-after-free in Linux kernel's net/sched: sch_qfq component

CVE-2023-4921

Description

A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation.

When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue().

We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.

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Affected products

305

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Vulnerability mechanics

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