CVE-2025-40158

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

ipv6: use RCU in ip6_output()

Use RCU in ip6_output() in order to use dst_dev_rcu() to prevent
possible UAF.

We can remove rcu_read_lock()/rcu_read_unlock() pairs
from ip6_finish_output2().

More information : https://git.kernel.org/stable/c/0393f85c3241c19ba8550f04a812e7d19f6b3082