Linux Kernel UDP Data-Race Vulnerability in sysctl_udp_l3mdev_accept

A data-race vulnerability has been identified in the Linux kernel's UDP implementation, specifically around the sysctl_udp_l3mdev_accept parameter. This vulnerability arises because the parameter can be changed concurrently while it is being read, creating a race condition. The issue has been addressed by adding a READ_ONCE() directive to the parameter's reader.

Impact

Exploitation of this vulnerability could lead to a data race condition, where concurrent read and write operations on sysctl_udp_l3mdev_accept could cause inconsistent or unexpected behavior in the UDP stack.