Linux Kernel IP Tunnel Statistics Handling Vulnerability

A vulnerability in the Linux kernel's IP tunnel implementation has been addressed. The issue arose because the function 'iptunnel_xmit_stats()' was not properly handling different types of per-CPU statistics for devices using VXLAN or Geneve tunnels. This oversight could lead to data corruption or system freezes on 32-bit kernels. The vulnerability was caused by the 'syncp' sequence being overwritten, disrupting the normal operation of the statistics tracking. The patch corrects this by ensuring that the statistics function appropriately recognizes the type of statistics being used, and also optimizes the code to prevent potential performance issues.

Impact

Exploitation of this vulnerability could cause data corruption or system freezes on 32-bit Linux kernels.