Linux Kernel Vulnerability in Networking Scheduling Framework by Vendor

CVE-2026-43496

What is CVE-2026-43496?

A vulnerability exists in the Linux kernel's networking scheduling framework that may cause a kernel panic. This issue arises during the dequeue process when a red qdisc interacts with its child's peek callback. Specifically, when a parent qdisc seeks to retrieve an skb from a child qdisc, it performs a peek operation first. If there is a packet available, it continues with a dequeue operation. However, improper handling of the dequeue can lead to dereferencing a null pointer, resulting in a system crash. This vulnerability has been addressed with a patch that modifies the dequeue mechanism to properly utilize the qdisc_dequeue_peeked() method, preventing the null pointer dereference and enhancing system stability.

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