Linux Kernel TCP Fast Open Data Race Vulnerability

A data race vulnerability has been identified in the Linux kernel's TCP implementation, specifically regarding the sysctl_tcp_fastopen parameter. This vulnerability allows the parameter to be read and modified concurrently, potentially leading to inconsistent behavior. The issue has been addressed by adding a READ_ONCE() directive to the readers of this parameter.

Impact

Exploitation of this vulnerability could lead to data corruption or inconsistent behavior in TCP fast open operations, as concurrent reads and writes to the sysctl_tcp_fastopen parameter could interfere with each other.