CVE-2026-63299
Last modified
CVE-2026-63299 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. An authorization bypass vulnerability in LXD allows an authenticated user to bypass project-level disk and volume limits. Two related code paths fail to verify resource limits during volume operations: the storagePoolVolumeTypePostMove function omits the limits.AllowVolumeCreation check before moving a volume across projects, and volume snapshot restore operations skip the AllowVolumeUpdate check when the configuration is nil (Config == nil). EPSS estimates a 0.28% chance of exploitation in the next 30 days.
Description
An authorization bypass vulnerability in LXD allows an authenticated user to bypass project-level disk and volume limits. Two related code paths fail to verify resource limits during volume operations: the storagePoolVolumeTypePostMove function omits the limits.AllowVolumeCreation check before moving a volume across projects, and volume snapshot restore operations skip the AllowVolumeUpdate check when the configuration is nil (Config == nil). An attacker can exploit these flaws to allocate storage resources that exceed the administrative limits configured for a project.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Lxd | >= 5.0.0, < 5.0.8 |
| Canonical | Lxd | >= 5.1, < 5.21.6 |
| Canonical | Lxd | >= 6.0, < 6.10 |
References
- https://github.com/canonical/lxd/security/advisories/GHSA-5h78-p252-989hVendor Advisory, Exploit, Mitigation
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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