Speculative Race Conditions (SRCs) for synchronization primitives similar like Spectre V1 with possibility to bypass software features (e.g., IPIs, high-precision timers, etc). In this flaw, all the common synchronization primitives can be microarchitecturally bypassed on speculative paths, turning all architecturally race-free critical regions into Speculative Race Conditions (SRCs). 

The goal of a GhostRace attack is to disclose arbitrary kernel data by exploiting a speculative race condition in an otherwise architecturally race-free critical region

Reference:
https://www.openwall.com/lists/oss-security/2024/03/12/14