CVE-2026-34177

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.

Affected Software

VendorProductVersion RangeStatus
Canonicallxd4.12.0 < 5.0.7affected
Canonicallxd5.1.0 < 5.21.5affected
Canonicallxd6.0.0 < 6.8.0affected

Weaknesses

  • CWE-184: CWE-184 Incomplete list of disallowed inputs

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: total

Additional References

References