CVE-2026-98653

A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) subsystem on s390 architectures. In nested virtualization environments, the kernel can erroneously pass an unhandled memory fault error to host userspace when shadowing nested guest memory pages that are not yet mapped. A guest operating system could leverage this behavior to trigger an unexpected hypervisor termination, resulting in a Denial of Service (DoS).

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.