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A vulnerability in the Linux kernel's IPv6 VTI (Virtual Tunnel Interface) implementation was resolved by correcting the use of network namespace references in the vti6_siocdevprivate() function. The flaw caused incorrect tunnel lookups when tunnels were migrated between network namespaces, potentially leading to incorrect packet delivery and privilege escalation. This issue affects multiple linux-aws kernel versions prior to 7.0.0-28.28~24.04.1 and related builds. A patch is available and should be applied to mitigate the risk.

The vulnerability (CVE-2026-63921) in the Linux kernel's IPv6 VTI code arises from inconsistent use of network namespace references during tunnel migration. Specifically, after a tunnel is moved through IFLA_NET_NS_FD, vti6_siocdevprivate() uses dev_net(dev) which points to the new network namespace, whereas vti6_update() uses t->net, the original namespace. This mismatch causes lookups to fail and tunnels to be incorrectly linked in the hash bucket of the original namespace, leading to packet misrouting and potential privilege escalation. The issue was fixed by ensuring vti6_siocdevprivate() uses ip6_tnl.net consistently. The vulnerability has a CVSS 3.1 score of 8.8 (high severity) and affects linux-aws kernel versions prior to 7.0.0-28.28~24.04.1 and related versions. Ubuntu has released patches addressing this and other kernel vulnerabilities.

Detailed information about In the Linux kernel, the following vulnerability has been resolved: ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate(). (CVE-2026-639

In the Linux kernel, the following vulnerability has been resolved: ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate(). (CVE-2026-63921) - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux aws: In the Linux kernel, the following vulnerability has been resolved: ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate(). (CVE-2026-63921)

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