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CVE-2026-98440

7.0 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Delay freeing of shadow S2 structures until VM destruction We free the shadow S2 structures from kvm_arch_flush…

Published Oct 18, 2026EPSS 0.12%

Overview

CVE-2026-98440 is a high-severity vulnerability. It was published on October 18, 2026 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: nv: Delay freeing of shadow S2 structures until VM destruction

We free the shadow S2 structures from kvm_arch_flush_shadow_all(), which

is a Bad Idea(tm). Freeing the page tables is fair game (this is what

this callback is for), but freeing the container that could still be

referenced by another part of the system is not great.

Instead, grow separate destructors that gets called when we tear the VM

down for good. From there, we can nuke both the individual MMUs as well

as the global array that points to them, safe in the knowledge that the

vcpus themselves have been destroyed already.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/22e82acec93a681071ed36f70eabe2d0c4e0bebdRefgit.kernel.org/stable/c/5bf1c9175e657b3c2dc1cf77403031ac7aadcf66Refgit.kernel.org/stable/c/876049f026b4dfaca0cc78ec81be0e639ca8525dRefgit.kernel.org/stable/c/e5843f4effaa2ffac3e789ecd4456403564961d4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98440?

CVE-2026-98440 is a high-severity vulnerability. It was published on October 18, 2026 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2026-98440?

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-98440?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-98440?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98440 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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