Linux Kernel ARP RCU Protection Vulnerability

A vulnerability in the Linux kernel's ARP (Address Resolution Protocol) handling has been addressed. The issue arose because the 'arp_xmit()' function could be called without proper protection from the RTNL (Routing Netlink) or RCU (Read-Copy-Update) mechanisms. This lack of protection created a potential use-after-free vulnerability. The kernel developers have resolved this issue by implementing the necessary RCU protection in the 'arp_xmit()' function.

Impact

Exploitation of this vulnerability could lead to a use-after-free condition, which may be exploited to execute arbitrary code or cause a denial-of-service condition by crashing the system.