# CVE-2026-40337

> Vulnerability · severity: **MEDIUM** (CVSS 5.1).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40337
- **Published:** 2026-04-18
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.1
- **CWE codes:** CWE-283

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40337

## Citation

> AI Analytics. CVE-2026-40337. Retrieved 2026-07-07 from https://api.ai-analytics.org/cve/CVE-2026-40337. Derived from NIST NVD. Licensed CC0.

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