CVE-2026-46131 KVM: x86: check for nEPT/nNPT in slow flush hypercalls
A logic error in KVM hypercall handling when nested paging is disabled can lead to a denial of service in the Linux kernel.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46131?
CVE-2026-46131 is a medium-severity vulnerability in Linux kernel, published on 28 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-46131?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46131?
Apply the vendor's patch.
Is CVE-2026-46131 being exploited?
There is no known exploitation of CVE-2026-46131 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-89009, BELL-CVE-2026-46131, DEBIAN-CVE-2026-46131, GHSA-3wqm-qqw5-qr42, ROOT-OS-UBUNTU-2404-CVE-2026-46131, UBUNTU-CVE-2026-46131.