CVE-2026-23401: KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE

Overview

Severity

High (CVSS 8.4)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-02

Last Updated

2026-04-29

EPSS Score

0.02% (percentile: 5.4%)

Affected Products (2)

Open Source Software

• azl3 kernel 6.6.130.1-3 on Azure Linux 3.0
• cbl2 kernel 5.15.202.1-1 on CBL Mariner 2.0

Revision History

• 2026-04-02: Information published.
• 2026-04-03: Information published.
• 2026-04-18: Information published.
• 2026-04-26: Information published.
• 2026-04-27: Information published.
• 2026-04-29: Information published.