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CVE-2026-40337

5.1 · MEDIUM

The Sentry kernel is a high security level micro-kernel implementation made for high security embedded systems.

Published Apr 18, 2026CWE-283EPSS 0.16%

Overview

CVE-2026-40337 is a medium-severity vulnerability. It was published on April 18, 2026 and has a CVSS 3.1 base score of 5.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.1, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

The Sentry kernel is a high security level micro-kernel implementation made for high security embedded systems. A given task with one of the DEV or IO capability is able to interact with another task's IRQ line through the __sys_int_* syscall familly. Prior to version 0.4.7, this can lead to DoS and covert-channels between this task and the outer world. A patch is available in version 0.4.7. As a workaround, reduce tasks that have the DEV and IO capability to a single one.

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

GitHubgithub.com/camelot-os/sentry-kernel/commit/150b7edd2c5b0da0a8baeed3135ddde613b08081GitHubgithub.com/camelot-os/sentry-kernel/pull/108GitHubgithub.com/camelot-os/sentry-kernel/security/advisories/GHSA-5hgv-rg2f-79pg

How CyberStrike helps

Frequently asked questions

What is CVE-2026-40337?

CVE-2026-40337 is a medium-severity vulnerability. It was published on April 18, 2026 and has a CVSS 3.1 base score of 5.1 (MEDIUM).

How severe is CVE-2026-40337?

This vulnerability has a CVSS 3.1 base score of 5.1, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-40337?

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-2026-40337?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-40337 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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