CVE-2023-52514 Information

Description

In the Linux kernel the following vulnerability has been resolved:

x86/reboot: VMCLEAR active VMCSes before emergency reboot

VMCLEAR active VMCSes before any emergency reboot not just if the kernel may kexec into a new kernel after a crash. Per Intel’s SDM the VMX architecture doesn’t require the CPU to flush the VMCS cache on INIT. If an emergency reboot doesn’t RESET CPUs cached VMCSes could theoretically be kept and only be written back to memory after the new kernel is booted i.e. could effectively corrupt memory after reboot.

Opportunistically remove the setting of the global pointer to NULL to make checkpatch happy.

Reference

https://git.kernel.org/stable/c/1375d9600c38c231163de584656b07aef9a27b0d https://git.kernel.org/stable/c/65edea77d7006140c6290e7f46009d75e02d3273 https://git.kernel.org/stable/c/b23c83ad2c638420ec0608a9de354507c41bec29