Linux Kernel Data Race Vulnerability in IPv4 Multipath Hash Fields

A data race vulnerability has been identified in the Linux kernel's IPv4 handling of the sysctl_fib_multipath_hash_fields. This vulnerability arises because the hash fields can be modified concurrently while being read, leading to potential inconsistencies. The issue has been addressed by adding a READ_ONCE() directive to the readers of this sysctl parameter.

Impact

The vulnerability could lead to inconsistent reads of the sysctl_fib_multipath_hash_fields, potentially causing incorrect behavior in applications or processes that rely on this data.