Linux · Linux Kernel · CVE-2025-21779
**Name of the Vulnerable Software and Affected Versions**
Linux kernel (affected versions not specified)
**Description**
A vulnerability in the Linux kernel has been resolved, related to KVM's handling of Hyper-V's SEND IPI hypercalls. The issue occurs when the local APIC is emulated in userspace, and Hyper-V enlightenments are exposed to the guest without an in-kernel local APIC, leading to a NULL-pointer dereference. The vulnerability is fixed by rejecting SEND IPI and SEND IPI EX hypercalls if the local APIC is not emulated by KVM.
**Recommendations**
At the moment, there is no information about a newer version that contains a fix for this vulnerability.