# CVE-2026-34177: incus: Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/li...

CVE-2026-34177 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-34177, released April 9, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-34177
- Priority: Urgent
- CVSS: 9.1 (critical)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 9, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260827T195228-160000.1.1 | [OPENSUSE-SU-2026:21761-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21761-1.md) | Sep 4, 2026 |
| Linux | govulncheck-vulndb sles 16.0 | 0.0.20260827T195228-160000.1.1 | [SUSE-SU-2026:23625-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23625-1.md) | Sep 4, 2026 |
| Linux | incus Debian 13.5 (trixie) | 6.0.2-1 | [DEBIAN-CVE-2026-34177](https://patchblox.com/security/data/fix/linux/debian-cve-2026-34177.md) | Apr 9, 2026 |
| Linux | incus Debian 14 | 6.0.2-1 | [DEBIAN-CVE-2026-34177](https://patchblox.com/security/data/fix/linux/debian-cve-2026-34177.md) | Apr 9, 2026 |
| Linux | lxd Debian 13.5 (trixie) | 5.0.2+git20231211.1364ae4-9+deb13u5 | [DEBIAN-CVE-2026-34177](https://patchblox.com/security/data/fix/linux/debian-cve-2026-34177.md) | Apr 9, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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