critical9.1
CVE-2026-34177
Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/limits/permissions.go), which omits raw.appa…
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/canonical/lxd | >= 0.0.0-20210305023314-538ac3df036e, <= 0.0.0-20260226085519-736f34afb267 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Canonical | Lxd | from 4.12 through 5.0.6 from 5.21.0 through 5.21.4 from 6.0 through 6.7 |