CVE-2026-34177 (GCVE-0-2026-34177)

Vulnerability from cvelistv5 – Published: 2026-04-09 09:15 – Updated: 2026-04-09 12:12
VLAI
Title
VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf
Summary
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.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-09 12:12 UTC
CWE
  • CWE-184 - Incomplete list of disallowed inputs
Assigner
canonical CNA under the mitre root
CNA scorecard B 82/100 over 60 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Canonical lxd Affected: 4.12.0 , < 5.0.7 (semver)
Affected: 5.1.0 , < 5.21.5 (semver)
Affected: 6.0.0 , < 6.8.0 (semver)
guessed Create a notification for this product.
Credits
Miha Purg
Show details on NVD website
To clipboard 

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