XDP Program Pointer Management Vulnerability in Linux Kernel veth Components

CVE-2026-98381

What is CVE-2026-98381?

A vulnerability in the Linux kernel's veth network interface can lead to improper handling of XDP program pointers during channel resizing. When channels are removed, associated XDP resources are torn down, yet the pointers remain intact. If these outdated pointers are referenced later during operations such as re-enabling NAPI or channel increases, it may cause significant system instability, including kernel panics due to dereferencing freed memory. This flaw emphasizes the importance of meticulous resource management for network components to ensure system reliability and security.

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