Is CVE-2026-40337 in the CISA KEV catalog?

No. CVE-2026-40337 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-40337?

CVE-2026-40337 has a CVSS v3 base score of 5.1 (MEDIUM).

What is the EPSS score for CVE-2026-40337?

CVE-2026-40337 has an EPSS score of 0.15% (5th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate 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.

CVE & CISA-KEV Catalog

CVE-2026-40337

MEDIUM

5.1

CVSS v3

NVD

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.

CWE-283

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

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:H

Exploit Intelligence

0.15%probability of exploitation in 30 days

5thpercentile

Low risk: more likely to be exploited than 5% of all known CVEs.

References

Other references3

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

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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.