Use After Free Vulnerability in Linux Kernel Networking Component

CVE-2025-21700

Summary

A vulnerability in the Linux kernel's networking subsystem allows for a use-after-free condition that can be exploited to gain elevated privileges. The flaw arises when managing queued disc drivers (qdiscs) in network traffic control. Specifically, the vulnerability permits an attacker to replace child qdiscs from one parent to another, potentially allowing unauthorized actions on the network node. A proper patch has been implemented to prevent improper configurations, ensuring that once a qdisc is assigned to a parent, it cannot be altered improperly, thus mitigating the risk of privilege escalation.

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