9.1

CVE-2026-34177

VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Canonical ≫ Lxd Version >= 4.12 <= 5.0.6
Canonical ≫ Lxd Version >= 5.21.0 <= 5.21.4
Canonical ≫ Lxd Version >= 6.0 <= 6.7
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.36% 0.28
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security@ubuntu.com 9.1 2.3 6
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE-184 Incomplete List of Disallowed Inputs

The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete.

https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f
Third Party Advisory
https://github.com/canonical/lxd/pull/17909
Issue Tracking