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CVE-2026-89500

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page Discarding a cached reader page after a concurrent ring buffer…

Published Sep 11, 2026EPSS 0.17%

Overview

CVE-2026-89500 is a high-severity vulnerability. It was published on September 11, 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:

ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page

Discarding a cached reader page after a concurrent ring buffer resize

uses the new global subbuf_order for the free_pages() call. This

mismatched order may crashes the kernel or leaks memory because the cached

page was allocated under the old size.

Save the actual free_page order alongside the page address to ensure we

always refer to the correct value and do not rely on the potentially

stalled cpu_buffer->subbuf_order value. The simplest is to make

free_page a buffer_data_read_page which already covers exactly what we

need: a page address and a page order.

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/7a1fb95de5404134f8758c1295ce88986bdf117cRefgit.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7Refgit.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772Refgit.kernel.org/stable/c/d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89500?

CVE-2026-89500 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89500?

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-2026-89500?

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-2026-89500?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89500 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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