SB2026093008 - Ubuntu update for lxc

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Main Vulnerability Database SB2026093008

SB2026093008 - Ubuntu update for lxc

Published: September 30, 2026 Updated: September 30, 2026

Security Bulletin ID SB2026093008
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Exposure of Resource to Wrong Sphere (CVE-ID: CVE-2022-47952)

CWE-ID: CWE-668 - Exposure of resource to wrong sphere

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to compromise the system.

The vulnerability exists due to exposure of resource to wrong sphere in lxc-user-nic. A local user can obtain file existence information.


2) Improper Authorization (CVE-ID: CVE-2026-39402)

CWE-ID: CWE-285 - Improper Authorization

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper access control in lxc-user-nic delete authorization logic when deleting OVS-attached network interfaces. A local user can request deletion of another user's OVS port to cause a denial of service.

This is limited to multi-tenant environments using lxc-user-nic with OpenVswitch bridges, and exploitation requires a valid lxc-usernet policy entry on the same bridge.


Remediation

Install update from vendor's website.

References