---
cve: "CVE-2026-45259"
severity: "MEDIUM"
cvss: 6.5
epss: "9%"
vendor: "FreeBSD"
kev: false
exploited: false
published: "2026-06-27 09:16:22"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-09T15:40:44+02:00"
---

# CVE-2026-45259

> 6.5 MEDIUM

## Beschreibung

sigqueue(2) was marked as permitted in capability mode with the introduction of Capsicum in 2011, but the implementation of kern_sigqueue did not include a capability mode check restricting signal delivery to the calling process's own PID.

A process in capability mode can use sigqueue(2) to send signals to any process it could signal following standard Unix permissions, bypassing the Capsicum sandbox restriction.  A compromised sandboxed process could interfere with other processes, for example by sending SIGKILL or SIGSTOP.  This could be any process running as the same user, or any process, for a superuser sandboxed process.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Referenzen

- <https://security.freebsd.org/advisories/FreeBSD-SA-26:28.capsicum.asc>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-45259) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_