Linux Kernel Data-Race Vulnerability in TCP/DCCP Sysctl Handling

A data-race vulnerability has been identified in the Linux kernel's TCP and DCCP protocols, specifically related to the sysctl_tcp_fwmark_accept variable. While this variable is being read, it can be concurrently modified, leading to potential inconsistencies. The vulnerability has been addressed by adding a READ_ONCE() directive to the variable's reader, ensuring safer access and preventing concurrent modification issues.

Impact

Exploitation of this vulnerability could lead to a data race condition, causing inconsistent reads of the sysctl_tcp_fwmark_accept variable, which could disrupt normal TCP or DCCP operations.