CVE-2026-34177

CRITICAL

9.1

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.

Details CVE

Score CVSS v3.19.1

SeveriteCRITICAL

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisHIGH

Interaction utilisateurNONE

Publie4/9/2026

Derniere modification4/13/2026

Sourcenvd

Observations honeypot0

Faiblesses (CWE)

CWE-184

References

https://github.com/canonical/lxd/pull/17909(security@ubuntu.com)

https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f(security@ubuntu.com)

https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f(134c704f-9b21-4f2e-91b3-4a467353bcc0)

Correlations IOC

Aucune correlation enregistree

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