CVE-2024-40983 is a medium severity vulnerability in the Linux kernel's TIPC (Transparent Inter-Process Communication) subsystem. It involves a missing forced reference count on the destination entry before performing decryption, which can lead to a kernel crash. The issue arises because crypto requests may return asynchronously, causing the code to leave the RCU-protected region without properly incrementing the reference count. This flaw was fixed by ensuring skb_dst_force() is called before decryption in the TIPC path.