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CVE-2026-89922

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Take srcu when importing watchpoint data __import_wp_info() backs up the original guest memory contents of a watchpo…

Published Sep 16, 2026EPSS 0.16%

Overview

CVE-2026-89922 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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:

KVM: s390: Take srcu when importing watchpoint data

__import_wp_info() backs up the original guest memory contents of a

watchpoint with read_guest_abs(), which is kvm_read_guest() and therefore

resolves the memslot via __kvm_memslots(). That requires kvm->srcu (or

kvm->slots_lock) to be held, otherwise a concurrent memslot update can

free the memslots array under us once its SRCU grace period has elapsed.

As this is not fast path, following lock ordering (mutex first, then

srcu) take the big hammer and hold the srcu for the full import.

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/4c05bf21d1806853e662cc19e744736a3408f155Refgit.kernel.org/stable/c/6830fbc3724bf49c142aae69a4694f115fa9ceddRefgit.kernel.org/stable/c/76f5b4ea9ed0aa5a34bda9d8a878f2c73026ec03Refgit.kernel.org/stable/c/a4e482def8533ebace517d9f67f1465841b1f982Refgit.kernel.org/stable/c/cc710ee45395efb4937e042960f791d33924e5f6Refgit.kernel.org/stable/c/f8e3a9997d5ecd56ebe4b262ff424516c068fecb

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89922?

CVE-2026-89922 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89922?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2026-89922?

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-2026-89922?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89922 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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