CVE-2026-12411: Broken Access Control in the devLXDInstancePatchHandler component of Canonical LXD allows an untrusted guest t

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HIGH 8.4UPGRADE

CVE-2026-12411 is a high-severity flaw (CVSS 8.4) affecting lxd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-639, CWE-862
Published	2026-06-26
Last modified	2026-10-25

Publisher (CNA): Canonical Ltd. · Vendor: canonical

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-26 16:16 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

canonical lxd UPGRADE

Affected: >= 6.6 and < 6.9

Fixed in: 6.9

Safe to downgrade to: a release before 6.6

1. Check installed version

apt-cache policy lxd || rpm -q lxd || lxd --version

2. UPGRADE to 6.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade lxd

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lxd

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.6 (Debian / Ubuntu)

apt-cache madison lxd sudo apt install lxd=<VERSION_BEFORE_6.6> sudo apt-mark hold lxd

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list lxd sudo dnf downgrade lxd-<VERSION_BEFORE_6.6> sudo dnf versionlock add lxd

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-12411?

lxd: upgrade to 6.9. Exact commands for each OS are on this page.

Is CVE-2026-12411 being exploited?

CVE-2026-12411 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-12411 affect?

CVE-2026-12411 affects lxd. Severity is high (CVSS 8.4). 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.

How urgent is CVE-2026-12411?

Priority 40/100. High severity; Public exploit reference

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References

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