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CVE-2026-23402

kernel: KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · April 1, 2026

Updated · June 28, 2026

Description

A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) module. This vulnerability allows a host user to bypass KVM's memory management rules by overwriting critical memory structures. This can lead to a compromise of the virtual machine's memory integrity, potentially causing system instability or unexpected behavior within virtualized environments.

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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-501 · Trust Boundary Violation