IPvlan Address Management Issue in Linux Kernel
CVE-2026-23103

Currently unrated

Key Information:

Vendor: Linux
Status: Linux
Vendor: CVE Published:; 4 February 2026

What is CVE-2026-23103?

A vulnerability in the Linux kernel's IPvlan module relates to the handling of address locks, which are not properly managed per port leading to potential race conditions. The initial design assumes address changes occur under the RTNL (Routing Netlink) lock; however, for IPv6, this assumption fails, resulting in possible false negatives and race conditions when managing IP addresses. This vulnerability is observed in the ipvlan_addr_busy() function, where simultaneous address modifications may be executed without proper lock synchronization, particularly affecting IPv6 address events. While the problem appears minor in frequency and performance impact, it necessitates careful management of locks to prevent inconsistent state and potential network disruptions.

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