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CVE-2026-90191

8.4 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mailbox: riscv-sbi-mpxy: validate RPMI notification lengths The SBI return value controls how many bytes are copied from shared…

Published Sep 17, 2026EPSS 0.18%

Overview

CVE-2026-90191 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, 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:

mailbox: riscv-sbi-mpxy: validate RPMI notification lengths

The SBI return value controls how many bytes are copied from shared

memory into the RPMI notification buffer. It is not validated against

the negotiated shared-memory size before that copy. The event walker

also uses a reversed loop condition and can inspect a short event record.

Validate the complete notification length before copying it, iterate only

while a full event header remains, and stop when a declared event payload

extends beyond the copied notification data.

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/11d5af151bcbe78f5a579e0faecd3be9cea0399aRefgit.kernel.org/stable/c/c7bc5e7677bcda7a446d63b989cfaa3fe91d6b76Refgit.kernel.org/stable/c/cbc24bce70dfd91c7b2f53b4fa896e9a4b6d6a6b

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90191?

CVE-2026-90191 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-90191?

This vulnerability has a CVSS 3.1 base score of 8.4, 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-2026-90191?

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-2026-90191?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90191 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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