CVE-2025-22063: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: netlabel: Fix NULL pointer exception caused by CALIPSO on IPv4 sockets When calling netlbl_conn_setattr(), addr->sa_family is used to determine the function behavior. If sk is an IPv4 socket, but the connect function is called with an IPv6 address, the function calipso_sock_setattr() is triggered. Inside this function, the following code is executed: sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; Since sk is an IPv4 socket, pinet6 is NULL, leading to a null pointer dereference. This patch fixes the issue by checking if inet6_sk(sk) returns a NULL pointer before accessing pinet6.

Affected products

• Linux Linux Kernel: from 4.8, before 5.4.292 (fixed in 5.4.292); from 5.5, before 5.10.236 (fixed in 5.10.236); from 5.11, before 5.15.180 (fixed in 5.15.180); from 5.16, before 6.1.134 (fixed in 6.1.134); from 6.2, before 6.6.87 (fixed in 6.6.87); from 6.7, before 6.12.23 (fixed in 6.12.23); …

Published 2025-04-16. Last modified 2026-06-17.