---
cve: "CVE-2026-34177"
severity: "CRITICAL"
cvss: 9.1
epss: "36%"
vendor: "Canonical"
kev: false
exploited: false
published: "2026-04-09 09:15:27"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T01:55:18+02:00"
---

# CVE-2026-34177

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/limits/permissions.go), which omits raw.apparmor and raw.qemu.conf from the set of keys blocked under the restricted.virtual-machines.lowlevel=block project restriction. A remote attacker with can_edit permission on a VM instance in a restricted project can inject an AppArmor rule and a QEMU chardev configuration that bridges the LXD Unix socket into the guest VM, enabling privilege escalation to LXD cluster administrator and subsequently to host root.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 7b1f0b6acefa288398ead8dda48b046d7b2795a3 (Commit)
- c5184be310b13a8be5d9a5f286bfa1c0c286716e (Commit)

## Referenzen

- <https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f>
- <https://github.com/canonical/lxd/pull/17909>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34177) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_