CVE-2026-40337
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 5% of all known CVEs.
References
Related Vulnerabilities
Other CWE-283 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2020-8554 | Medium | 6.3 | 9.3% | - | Fix |
| CVE-2024-27903 | Critical | 9.8 | 8.9% | - | Fix |
| CVE-2021-24501 | High | 8.1 | 1.3% | - | Fix |
| CVE-2021-24500 | High | 8.1 | 0.6% | - | Fix |
| CVE-2025-1007 | Medium | 5.3 | 0.5% | - | Fix |
| CVE-2022-29220 | Medium | 6.5 | 0.5% | - | Fix |
Common questions
How do I fix CVE-2026-40337?
No published fix for CVE-2026-40337 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-40337 being actively exploited?
Not that we know of. CVE-2026-40337 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.15% is the estimated probability that it will be exploited in the next 30 days. That is higher than 5% of all scored CVEs.
How severe is CVE-2026-40337?
CVE-2026-40337 has a CVSS v3 base score of 5.1, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.