What’s Vulnerable › Vulnerabilities

CVE-2026-46131: KVM: x86: check for nEPT/nNPT in slow flush hypercalls

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-28 · updated 2026-06-24

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: check for nEPT/nNPT in slow flush hypercalls Checking is_guest_mode(vcpu) is incorrect, because translate_nested_gpa() is only valid if an L2 guest is running *with nested EPT/NPT enabled*. Instead use the same condition as translate_nested_gpa() itself.

Affected products

• Linux kernel: from 6.2 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 7.1-rc1, 7.1-rc2 — fixed in 6.12.88, 6.18.30, 6.6.140, 7.0.7

How to fix

Upgrade to a fixed version: Linux kernel 6.12.88, 6.18.30, 6.6.140, 7.0.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/45fc766bc756ff1d66f8ca026a9c4f7f764adfae
• https://git.kernel.org/stable/c/464af6fc2b1dcc74005b7f58ee3812b17777efee
• https://git.kernel.org/stable/c/4c7f8436b19a2a3acc0cb6b6e3becd6796ae5c57
• https://git.kernel.org/stable/c/971f17f5d91045404e3914029ea57c3da90179a4
• https://git.kernel.org/stable/c/d6f4e217d663ede5becc2fd6cb612c749677387b

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