KVM Vulnerability in Linux Kernel Impacting Page Table Management

CVE-2026-53277

What is CVE-2026-53277?

A vulnerability in the KVM component of the Linux Kernel can occur during page table walks, specifically in fault injection and AT emulation processes. Functions such as walk_s1() and kvm_walk_nested_s2() are designed to operate under the protection of the SRCU lock. However, certain operations bypass this safeguard, leading to potential inconsistencies and exposure to memslot changes. The issue has been addressed by ensuring the acquisition of the SRCU lock before executing critical table walks, thus enhancing the security and stability of the virtualized environment.

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