CVE-2026-34177
published 2026-04-09CVE-2026-34177: Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/limits/permissions.go), which omits…
critical9.1CVSS 3.1
AVNACLPRHUINSCCHIHAH
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
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| canonical | lxd | 4.12 – 5.0.6 | — |
| canonical | lxd | >= 4.12.0 < 5.0.7 | 5.0.7 |
| canonical | lxd | >= 5.1.0 < 5.21.5 | 5.21.5 |
| canonical | lxd | 5.21.0 – 5.21.4 | — |
| canonical | lxd | 6.0 – 6.7 | — |
| canonical | lxd | >= 6.0.0 < 6.8.0 | 6.8.0 |
| github.com | canonical_lxd | 0.0.0-20210305023314-538ac3df036e – 0.0.0-20260226085519-736f34afb267 | — |