Sentry kernel has incomplete ownership check for IRQ line manipulation
Key facts
- Attack vector
- Local
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| camelot-os | sentry-kernel | before 0.4.7 | 0.4.7 | Patch available | CNA |
- sentry-kernel Vendorcamelot-os Affected before 0.4.7 Fixed in 0.4.7 Patch available CNA
Remediation
- Fix · CNA sentry-kernel (camelot-os) Fixed in 0.4.7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-40337
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences