CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's networking component, specifically the bridge functionality, where improper handling of port groups during multicast leave operations can lead to dereferencing a deleted entry. This flaw could potentially allow an attacker to exploit stale pointers, leading to unexpected behavior or crashes within the network bridge. System administrators and organizations utilizing Linux-based systems with multicast-to-unicast configurations should prioritize addressing this issue to maintain network stability and security.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: net: bridge: stop fast-leave after deleting a port group br_multicast_leave_group() iterates mp->ports with pp = &p->next in its fast-leave path. After br_multicast_del_pg() removes p, continuing the loop advances pp through the deleted entry. If multicast-to-unicast was enabled, the bridge can hold multiple port groups for the same port and group with different source MAC addresses. Once multicast-to-unicast is disabled, br_port_group_equal() matches those entries by port only. A fast leave can then delete one entry and continue from its stale next pointer, leaving mp->ports pointing at a deleted port group. Fast leave only needs to remove one matching port group. Break after br_multicast_del_pg() so the loop stops before dereferencing the removed entry.