CVE-2026-9640
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.
CSIRTS triage
- What
- Multiple security issues in LXD could allow bypass of security restrictions or execution of arbitrary commands.
- Who is affected
- Deployments of LXD are affected.
- Urgency
- Remediation is necessary due to the potential for serious security breaches.
- Action
- Apply the latest security update for LXD.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.63% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 48% of all EPSS-scored CVEs.
Advisory coverage (2)
- unknownDSA-6373-1 lxd - security updatedebian · 2026-06-28
- highCVE-2026-9640: A privilege escalation vulnerability exists in LXD from 6.0 before 6.9, 5.21.0 before 5.21.5, a…nvd · 2026-06-26
External references
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