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CVE-2026-9640

Canonical Lxd broken access control

7.2 HIGHPublic exploitEPSS 0.63%
  1. Published26 Jun 2026

Description

A privilege escalation vulnerability exists in LXD from 6.0 before 6.9, 5.21.0 before 5.21.5, and 5.0.0 before 5.0.7 regarding the handling of project-restriction policies during snapshot restoration.. An authenticated project operator in a restricted multi-tenant environment can bypass policy restrictions by importing a maliciously crafted instance backup containing restricted configuration keys within a snapshot. When the snapshot is restored, these restricted keys are applied to the live instance without policy validation. Starting the modified instance grants the operator unauthorized host root access.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

Canonical Lxd≥ 4.12 < 5.0.7 · ≥ 5.21.0 < 5.21.5 · ≥ 6.0 < 6.9

Remediation

Fixed in
Canonical Lxd≥ 5.0.7

References

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Frequently asked

Is CVE-2026-9640 being actively exploited?

CVE-2026-9640 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.63%.

How severe is CVE-2026-9640?

CVE-2026-9640 has a CVSS 3.1 base score of 7.2, rated high. EPSS estimates a 0.63% probability of exploitation.

Which products are affected by CVE-2026-9640?

Affected products include Canonical Lxd.

How do I fix CVE-2026-9640?

Upgrade affected software to a fixed version, for example Canonical Lxd 5.0.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-9640 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.