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Vulnerability record · CVE-2026-34177 · published 9 April 2026

CVE-2026-34177: Canonical lxd vulnerability

Canonical · Lxd

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.

9.1 CVSS 3.1 Critical EPSS 0.61% · top 52.8% CWE-184 · CWE-184
9.1CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/canonical/lxd/pull/17909 Issue Tracking
https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f Third Party Advisory
https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2026-66897Canonical lxd path traversal vulnerabilityA path traversal vulnerability in LXD's instance template processing allows an attacker with container edit permissions, or any user launching a craf…EPSS 0.72%9.9CVE-2026-66898Canonical lxd path traversal vulnerabilityA path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing …EPSS 0.59%9.9CVE-2026-63293Canonical lxd link following vulnerabilityA link following vulnerability in LXD allows an attacker to achieve arbitrary file read and write operations on the host system. When importing or un…EPSS 0.59%9.9CVE-2026-63294Canonical lxd link following vulnerabilityA link following vulnerability in LXD allows an attacker to achieve root command execution on the host system. During the import or unpacking of craf…EPSS 0.88%9.9CVE-2026-63296Canonical lxd incorrect authorization vulnerabilityAn authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project restrictions during instance migration. When m…EPSS 0.44%9.9CVE-2026-63297Canonical lxd toctou race condition vulnerabilityAn authorization bypass vulnerability in LXD due to a timing flaw during configuration merging allows an authenticated attacker to bypass target proj…EPSS 0.34%9.9CVE-2026-63298Canonical lxd os command injection vulnerabilityAn improper neutralization of special elements vulnerability in LXD's NVIDIA instance configuration handling allows an authenticated attacker to inje…EPSS 0.69%9.9CVE-2026-63299Canonical lxd allocation without limits vulnerabilityAn authorization bypass vulnerability in LXD allows an authenticated user to bypass project-level disk and volume limits. Two related code paths fail…EPSS 0.59%

Source: NIST National Vulnerability Database (record CVE-2026-34177), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.