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CVE-2026-89959

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove The vfio_ap_config_remove function uses the bitmap_andnot f…

Published Sep 16, 2026EPSS 0.17%

Overview

CVE-2026-89959 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, 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:

s390/vfio-ap: Fix control domain removal in vfio_ap_mdev_cfg_remove

The vfio_ap_config_remove function uses the bitmap_andnot function to clear

bits from the matrix_mdev->matrix.adm bitmap (specifies the control domains

assigned to the mdev). This prevents the explicitly unplugged control

domains from being removed the KVM guest. The bitmap_and function is used

instead.

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/02e72909453dee2f8a09f78819f9a9cb902dfbdcRefgit.kernel.org/stable/c/12871a4269f139221c9fde9ea3eb69c9228f59d4Refgit.kernel.org/stable/c/2ff68bf414de167bc138e6e211ee1ad3ab3c5052Refgit.kernel.org/stable/c/4bffadde7fc49b00493fb78c6376f958998d4b8cRefgit.kernel.org/stable/c/6b8a02e216f6b520cc029e43ddc83956605135d5Refgit.kernel.org/stable/c/f7d66afc34bc6e833c8ebe56973afec35f473bc1

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89959?

CVE-2026-89959 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-89959?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2026-89959?

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-2026-89959?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89959 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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