CVE-2024-57951 is a high-severity vulnerability in the Linux kernel's hrtimers subsystem related to improper handling of CPU state during CPU hotplug operations. The flaw causes stale per-CPU state and incorrect flags to persist when a CPU transitions through certain hotplug states, potentially leading to kernel warnings and dangling pointers. This can affect system stability and security. The issue has been fixed in multiple Linux kernel versions starting from 5.4.0-1090.95 and related releases.