Vulnerability Description
Software which sets SO_REUSEPORT_LB on a socket and then connects it to a host will not directly observe any problems. However, due to its membership in a load-balancing group, that socket will receive packets originating from any host. This breaks the contract of the connect(2) and implied connect via sendto(2), and may leave the application vulnerable to spoofing attacks. The kernel failed to check the connection state of sockets when adding them to load-balancing groups. Furthermore, when looking up the destination socket for an incoming packet, the kernel will match a socket belonging to a load-balancing group even if it is connected, in violation of the contract that connected sockets are only supposed to receive packets originating from the connected host.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://security.freebsd.org/advisories/FreeBSD-SA-25:09.netinet.asc
- https://www.usenix.org/system/files/conference/usenixsecurity26/sec26_prepub_ben
FAQ
What is CVE-2025-24934?
CVE-2025-24934 is a vulnerability with a CVSS score of 5.4 (MEDIUM). Software which sets SO_REUSEPORT_LB on a socket and then connects it to a host will not directly observe any problems. However, due to its membership in a load-balancing group, that socket will recei...
How severe is CVE-2025-24934?
CVE-2025-24934 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-24934?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.