CVE-2025-22063: netlabel: Fix NULL pointer exception caused by CALIPSO on IPv4 sockets
First published: Wed Apr 16 2025(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=4.8<5.4.292 | |
| Linux Kernel | >=5.5<5.10.236 | |
| Linux Kernel | >=5.11<5.15.180 | |
| Linux Kernel | >=5.16<6.1.134 | |
| Linux Kernel | >=6.2<6.6.87 | |
| Linux Kernel | >=6.7<6.12.23 | |
| Linux Kernel | >=6.13<6.13.11 | |
| Linux Kernel | >=6.14<6.14.2 |
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Reference Links
- https://git.kernel.org/stable/c/1ad9166cab6a0f5c0b10344a97bdf749ae11dcbf
- https://git.kernel.org/stable/c/1e38f7a6cdd68377f8a4189b2fbaec14a6dd5152
- https://git.kernel.org/stable/c/a7e89541d05b98c79a51c0f95df020f8e82b62ed
- https://git.kernel.org/stable/c/797e5371cf55463b4530bab3fef5f27f7c6657a8
- https://git.kernel.org/stable/c/1927d0bcd5b81e80971bf6b8eba267508bd1c78b
- https://git.kernel.org/stable/c/3ba9cf69de50e8abed32b448616c313baa4c5712
- https://git.kernel.org/stable/c/9fe3839588db7519030377b7dee3f165e654f6c5
- https://git.kernel.org/stable/c/172a8a996a337206970467e871dd995ac07640b1
- https://git.kernel.org/stable/c/078aabd567de3d63d37d7673f714e309d369e6e2
Frequently Asked Questions
What is the severity of CVE-2025-22063?
CVE-2025-22063 is considered a medium severity vulnerability due to the potential for a NULL pointer dereference.
How do I fix CVE-2025-22063?
To fix CVE-2025-22063, it is recommended to update the Linux kernel to a version that includes the patch addressing this vulnerability.
What systems are affected by CVE-2025-22063?
CVE-2025-22063 affects Linux kernel versions that utilize IPv4 sockets and the netlbl_conn_setattr() function.
What type of vulnerability is CVE-2025-22063?
CVE-2025-22063 is a NULL pointer dereference vulnerability in the Linux kernel networking subsystem.
Is there a known exploit for CVE-2025-22063?
As of now, there is no publicly known exploit for CVE-2025-22063, but it should be addressed promptly to prevent potential exploitation.
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