Linux Kernel Data-Race Vulnerability in IPv4 Sysctl Handling

A data-race vulnerability has been identified in the Linux kernel's IPv4 subsystem, specifically around the 'sysctl_fib_sync_mem' variable. This vulnerability arises because the variable can be modified concurrently while it is being read, leading to potential inconsistencies. The issue has been addressed by adding a 'READ_ONCE()' directive to synchronize access and prevent the data-race.

Impact

Exploitation of this vulnerability could lead to a data-race condition, causing inconsistent or unexpected behavior in the system.