What’s Vulnerable › Vulnerabilities

CVE-2026-64562: KVM: nVMX: Hide shadow VMCS right after VMCLEAR

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-04 · updated 2026-10-19
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Hide shadow VMCS right after VMCLEAR free_nested() frees the shadow VMCS while vmcs01 still points to it. But because it is asynchronous with respect to loaded_vmcs_clear(), the vCPU might migrate before the pointer is cleared and __loaded_vmcs_clear() may then execute VMCLEAR. The VMCS needs to stay attached until its explicit VMCLEAR completes, but then it can be hidden and the page safely freed.

Affected products

• Linux kernel: 4.9 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1dabef6e206568bf9d9ade74f6e56a48ea35695d
• https://git.kernel.org/stable/c/4f50e6aec16f69627dbad5704d1e90a255d766a7
• https://git.kernel.org/stable/c/589419470030a89f16cf19300658b6dc644ca946
• https://git.kernel.org/stable/c/622ebfac01ba4f9c0060cebd41257fe46fc4a0b3
• https://git.kernel.org/stable/c/8001d2ce9d9bd09118ce523aef595aa094573ae3
• https://git.kernel.org/stable/c/af56298e9d86e6098cd1d2e155cb2949b7c45412
• https://git.kernel.org/stable/c/b82c3144d8264265448292ca406f60bafeba3b6f
• https://git.kernel.org/stable/c/dc3eecfa219ebc9d01eaf7d1abd1441efe884dab

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