CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's VXLAN implementation, specifically during the flushing of the Forwarding Database (FDB) entries, which can lead to an invalid remote pointer being accessed. This flaw may allow an attacker to exploit memory corruption, potentially leading to arbitrary code execution or denial of service. Organizations utilizing Linux-based systems with VXLAN configurations should prioritize patching this vulnerability to mitigate associated risks.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: vxlan: keep the last remote linked during FDB flush A non-nexthop FDB entry is expected to have at least one remote while it remains reachable through the FDB hash table. A filtered bulk flush violates this invariant when every remote matches: It unlinks the last remote in vxlan_fdb_dst_destroy() and only afterwards tells vxlan_flush() to destroy the parent FDB entry. An RCU reader can find the parent during this interval. first_remote_rcu() then applies list_entry_rcu() to the empty list head, producing an invalid remote pointer that the receive learning path can read from and write to. When a matching remote is the sole remaining remote, leave it linked and ask the caller to destroy the entire FDB entry. vxlan_fdb_destroy() keeps the remote attached while sending the deletion notification and removing the parent from the lookup structures.