CVE-2026-80733

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the sk mc loop() function where it can be called for sockets that are neither AF INET nor AF INET6, such as AF PACKET sockets used when sending packets via raw/packet sockets over virtual devices like VRF or ipvlan. In these instances, the sk family variable is not AF INET or AF INET6, causing the execution to fall through a switch statement and trigger the WARN ON ONCE() function. Since non-INET sockets do not support IP MULTICAST LOOP or IPV6 MULTICAST LOOP options, the loopback should default to true without generating a warning.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.