In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU protection in ip6_default_advmss() ip6_default_advmss() needs rcu protection to make sure the net structure it reads does not disappear. CREATE(Triage):(User=admin) CVE-2025-21765 (https://nvd.nist.gov/vuln/detail/CVE-2025-21765)