CVE-2026-23300

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

Description A kernel panic occurs when an IPv4 route references a standalone IPv6 nexthop object created with a loopback device. The function fib6 nh init() misclassifies these objects as reject routes because they lack a destination prefix (fc dst=::), which causes fib6 is reject() to match any loopback nexthop. Consequently, the reject path bypasses fib nh common init(), leaving the variable nhc pcpu rth output unallocated. When mkroute output() subsequently dereferences the NULL nhc pcpu rth output, the system panics.

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