CVE-2026-63968

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible infinite loop in fib6_select_path() Found while auditing the same pattern Sashiko reported in rt6_fill_node() [1]. Apply the same fix as commit f8d8ce1b515a ("ipv6: fix possible infinite loop in fib6_info_uses_dev()"). Writers holding tb6_lock can list_del_rcu(&first->fib6_siblings) without waiting for RCU readers; first->fib6_siblings.next then still points into the old ring and this softirq-side walker never reaches &first->fib6_siblings as its terminator. fib6_purge_rt() always WRITE_ONCE()s first->fib6_nsiblings to 0 before list_del_rcu(), so an inside-loop check is a reliable detach signal. [1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev

• CWE-835
• CWE-835

• https://git.kernel.org/stable/c/0f7b73c3452635de83b8711b31abdda8e49aad7bPatch
• https://git.kernel.org/stable/c/3948a7d92f7678e89e1776bb2d169afcad63b1aePatch
• https://git.kernel.org/stable/c/9b9d5bd6e3d4c9cecab5407604b690684b2532d2Patch
• https://git.kernel.org/stable/c/9c7da87c2dc860bb17ca1ece942495d28b1ce3b9Patch
• https://git.kernel.org/stable/c/ab9a10969a907b472a0196d999c08ff7144172e3Patch
• https://git.kernel.org/stable/c/c87cd3cb309634bc8f50a54e2079424f219ac21fPatch

Published

Jul 19, 2026

Last Modified

Oct 30, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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