CVE-2026-98603

An RCU published ovpn bind can be modified in place while concurrent TX paths read it without locking. When a remembered IPv6 source address becomes unusable, clearing the 128 bit local address can be observed as a torn value and may cause route lookup or cached routing state to use an inconsistent source address. The most credible effects are packet loss, incorrect source address selection, disruption of an OVPN peer, or limited interaction with source based routing policy. No UAF, OOB access, arbitrary write, or direct kernel crash primitive is established by the shown code. For the CVSS the PR:L value in the paranoid score represents deployments where a container or restricted network service has delegated control over its OVPN interface or network namespace. The race requires the remembered local source to become invalid while concurrent transmission is active, so AC:H is appropriate. A remote peer can contribute traffic but cannot reliably trigger the required local address invalidation through network traffic alone. Impact is primarily availability related, with limited confidentiality or integrity impact remaining possible if an inconsistent source selects an unintended routing path.