CVE-2024-40957

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

Description The issue is related to the Linux kernel's seg6 module, where the input action end dx4() and input action end dx6() functions are called with NF HOOK() for the PREROUTING hook. In this hook, a valid indev and a NULL outdev should be passed to NF HOOK(). However, if a NULL indev is passed, it may trigger a NULL pointer dereference. This can occur when input action end dx4() passes a NULL indev to NF HOOK(), which can then trigger a NULL dereference in rpfilter mt()->rpfilter is loopback(). The rpfilter is loopback() function checks if a packet is a loopback packet or if the input device has the IFF LOOPBACK flag set.

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