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CVE-2026-89818

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check If the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expr…

Published Sep 16, 2026EPSS 0.16%

Overview

CVE-2026-89818 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. Some level of privileges is required for exploitation.

Technical description

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

drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check

If the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression

6 + num_buffers * 4 wraps to 2 and the bounds check passes, letting

the parser loop far past the end of the message BO. Triggering it

additionally requires a ~4GiB mapping so that msg[1] survives the

earlier "header does not fit in BO" check.

Rewrite the test in division form, which is overflow-free by

construction. Also update the message to reflect that msg is invalid.

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/47799e1f893d47d8af231710a61065e3ec8a13e8Refgit.kernel.org/stable/c/4d7390530853eb7befda9cc786e4c86e8ad7ac9eRefgit.kernel.org/stable/c/6dceaeceaa7c8396339f3ea34b0110cb912ca61bRefgit.kernel.org/stable/c/7e28853c78c20bb8ba4c1dba702430cd05e09f76Refgit.kernel.org/stable/c/9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3Refgit.kernel.org/stable/c/c2340281be4ddacb8c203e2bce59b126d1d6c4c8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89818?

CVE-2026-89818 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-2026-89818?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2026-89818?

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-2026-89818?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89818 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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