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CVE-2026-89912

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save MAPC with V=0 drops ite->collection but leaves the ITE on…

Published Sep 16, 2026EPSS 0.18%

Overview

CVE-2026-89912 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save

MAPC with V=0 drops ite->collection but leaves the ITE on the device's

ITT list, and vgic_its_save_ite() dereferences it unconditionally. A

guest that issues MAPD, MAPTI and then MAPC(V=0) therefore oopses the

host when the VMM issues KVM_DEV_ARM_ITS_SAVE_TABLES to migrate it.

That sequence is UNPREDICTABLE per the architecture, but KVM already

handles the resulting state in the translate, MOVI and DISCARD paths.

Save a zeroed entry, which vgic_its_restore_ite() reads back as

invalid. Skipping the ITE instead would leave the ITT slot holding

whatever is in guest memory, and restore rejects an entry naming a

collection the restored collection table does not have.

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/0fb71211146e39cf67811ccb873d2770a9c129acRefgit.kernel.org/stable/c/2c3a87ad3d3935c43d465cd2465db9020f9e898fRefgit.kernel.org/stable/c/36df368861d2664291298feeb37dfef43fcae670Refgit.kernel.org/stable/c/3d4c26b16a04a084fe0bde08ccdd8086570f8bbeRefgit.kernel.org/stable/c/566d0f99aec92280ce403f22068eb07241a79e2aRefgit.kernel.org/stable/c/c6c156d931c33b92362383cf76f6d6e1291dcbfeRefgit.kernel.org/stable/c/dd0c3e6c03e3bb3fd7c0fa422230020674c5c25eRefgit.kernel.org/stable/c/df829e4fe235b3a0dbf830986d81c040d3d2e940

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89912?

CVE-2026-89912 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-89912?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-89912?

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-2026-89912?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89912 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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