Incorrect Authorization Affecting lxc package, versions [,7.0.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published6 May 2026
- disclosed5 May 2026
- creditsnoopysecurity
Introduced: 5 May 2026
CVE-2026-39402 (opens in a new tab)How to fix?
Upgrade lxc to version 7.0.0 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Authorization through insufficient ownership validation in the find_line function of the setuid helper, allowing an attacker to delete OpenVSwitch-attached network interfaces belonging to other users by exploiting a logic flaw in the authorization process. An attacker can disrupt network connectivity for other tenants by issuing deletion requests for OVS ports they do not own. This is only exploitable if the environment is multi-tenant, using lxc-user-nic with OpenVSwitch bridges, and the attacker has a valid lxc-usernet policy entry.