cve-2026-23401

About this tag
CVE-2026-23401 is a Linux kernel vulnerability affecting KVM-based virtualization on x86 hosts. The flaw resides in KVM's x86 memory-management code, where a shadow page table entry can be overwritten as an emulated MMIO entry without first removing the existing present mapping. This bug has serious availability implications and potential memory-corruption consequences in host kernel context. While not a remote internet exploit, it is a local virtualization bug that threatens host availability. Discussions on WindowsForum cover the technical details, impact, and mitigation strategies for CVE-2026-23401, making it a critical topic for administrators managing KVM virtualized environments.

  1. CVE-2026-23401 KVM MMU: Guest-Triggered MMIO SPTE Bug Threatens Host Availability

    CVE-2026-23401 is the kind of Linux kernel vulnerability that looks modest on a scorecard but deserves close attention from anyone running KVM-based virtualization on x86 hosts. The flaw sits in KVM’s x86 memory-management code, where a shadow page table entry can be overwritten as an emulated...
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    • cve-2026-23401 kvm virtualization linux kernel security mmio shadow paging
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    • Forum: Security Alerts