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A high-severity vulnerability (CVE-2026-63917) in the Linux kernel's IPv6 VTI (Virtual Tunnel Interface) implementation was resolved. The flaw involved improper handling of network namespaces during tunnel device link changes, causing stale entries and potential kernel memory corruption. This could be triggered by unprivileged users, leading to privilege escalation and system compromise. Multiple affected versions of the linux-aws kernel prior to specific 7.0.0 builds are vulnerable. A patch is available and should be applied to mitigate the issue.

CVE-2026-63917 is a vulnerability in the Linux kernel's IPv6 VTI subsystem where the function vti6_changelink() improperly uses dev_net(dev) after a tunnel device moves between network namespaces. This leads to stale entries in per-net namespace hash tables, causing kernel memory corruption and a BUG in net/core/dev.c. The flaw can be triggered from an unprivileged user namespace. The issue was introduced by commit 61220ab34948 which dropped NETIF_F_NETNS_LOCAL from vti6 devices, causing inconsistent namespace references during device moves. The vulnerability was resolved by correctly using ip6_tnl.net in vti6_changelink().

Detailed information about In the Linux kernel, the following vulnerability has been resolved: ip6: vti: Use ip6_tnl.net in vti6_changelink(). (CVE-2026-63917).

In the Linux kernel, the following vulnerability has been resolved: ip6: vti: Use ip6_tnl.net in vti6_changelink(). (CVE-2026-63917) - 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_changelink(). (CVE-2026-63917)

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