In the Linux kernel, the following vulnerability has been resolved:

ipv6: fix possible infinite loop in rt6_fill_node()

Sashiko reported this issue [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(&rt->fib6_siblings)
without waiting for RCU readers; rt->fib6_siblings.next then still
points into the old ring and this softirq-side walker never reaches
&rt->fib6_siblings, causing a CPU stall. fib6_del_route() always
WRITE_ONCE()s rt->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

https://git.kernel.org/stable/c/279853aec9f58d5cd723e6e5617c1c3337b30383

https://git.kernel.org/stable/c/5e40de719ee76b8d96e2556ce36dbd3bd07bf37d

https://git.kernel.org/stable/c/9f72412bcf60144f252b0d6205106abf14344abc

https://git.kernel.org/stable/c/b014a63d2f2c2c767762b548381882dfb1655529

https://git.kernel.org/stable/c/c65b1f60237daac7c56c2652e064cc566a45dc81

https://git.kernel.org/stable/c/dc36a04621dcc2447dae428709207810b6c06e14

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