---
id: CVE-2026-12411
title: >-
  Broken Access Control in the devLXDInstancePatchHandler component of Canonical
  LXD allows an untrusted guest to mount, read, and overwrite another guest's
  custom storage volume via a crafted device PATCH request over /dev/lxd when
  securi…
summary: >-
  Broken Access Control in the devLXDInstancePatchHandler component of Canonical
  LXD allows an untrusted guest to mount, read, and overwrite another guest's
  custom storage volume via a crafted device PATCH request over /dev/lxd when
  securi…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N'
cwe:
  - CWE-639
  - CWE-862
vendor: canonical
product: lxd
affected:
  - 'lxd >= 6.6, < 6.9'
patched:
  - lxd 6.9
published: '2026-06-26'
updated: '2026-07-02'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-12411'
references:
  - url: 'https://github.com/canonical/lxd/pull/18585'
    label: security@ubuntu.com
  - url: 'https://github.com/canonical/lxd/security/advisories/GHSA-hhf9-qw4v-72xp'
    label: security@ubuntu.com
  - url: 'https://github.com/canonical/lxd/security/advisories/GHSA-hhf9-qw4v-72xp'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00288
epssPercentile: 0.18994
ingestedAt: '2026-07-03T13:02:28.081Z'
---

## Overview

Broken Access Control in the devLXDInstancePatchHandler component of Canonical LXD allows an untrusted guest to mount, read, and overwrite another guest's custom storage volume via a crafted device PATCH request over /dev/lxd when security.devlxd.management.volumes is enabled.

## Affected

- `lxd >= 6.6, < 6.9`

## Remediation

Upgrade past the affected range:

- `lxd 6.9`