CVE-2026-98717

kernel: KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy

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Severity

Moderate

Red Hat Product Security

4.7

CVSS 3.1

Review impact separately from score.

Published · October 18, 2026

Updated · October 23, 2026

Description

A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem. This vulnerability allows a local user or guest virtual machine to cause a Denial of Service (DoS) by crashing the host kernel. The issue stems from a race condition between memory slot creation and stage-2 page fault handling, leading the memory management unit to improperly walk invalid shadow page tables and trigger a NULL pointer dereference.

CVSS score applicability

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.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 4.7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference