CVE-2026-34177
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.
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| canonical lxd | 4.12 ≤ v ≤ 5.0.6, 5.21.0 ≤ v ≤ 5.21.4, 6.0 ≤ v ≤ 6.7 | — |
| github.com/canonical/lxdGo | 0.0.0-20210305023314-538ac3df036e ≤ v ≤ 0.0.0-20260226085519-736f34afb267, 0.0.0-20210305023314-538ac3df036e ≤ v | — |
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Attack Surface Management
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