CVE-2026-39402
Description
A flaw was found in LXC (Linux Containers), specifically within the lxc-user-nic helper. This logic flaw allows an unprivileged attacker, with a valid lxc-usernet policy entry, to delete OpenVSwitch (OVS)-attached network interfaces owned by other users. In multi-tenant environments using lxc-user-nic with OVS bridges, this can lead to a denial of service (DoS), enabling one tenant to repeatedly disconnect network services from containers run by another tenant on shared infrastructure.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Access control checks for specific user data or functionality can be bypassed.
Access Control
Technical Impact: Gain Privileges or Assume Identity
Horizontal escalation of privilege is possible (one user can view/modify information of another user).
Access Control
Technical Impact: Gain Privileges or Assume Identity
Vertical escalation of privilege is possible if the user-controlled key is actually a flag that indicates administrator status, allowing the attacker to gain administrative access.
Frequently Asked Questions
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