CVE-2018-6556

Publication date 6 August 2018

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

3.3 · Low

Score breakdown

Description

lxc-user-nic when asked to delete a network interface will unconditionally open a user provided path. This code path may be used by an unprivileged user to check for the existence of a path which they wouldn't otherwise be able to reach. It may also be used to trigger side effects by causing a (read-only) open of special kernel files (ptmx, proc, sys). Affected releases are LXC: 2.0 versions above and including 2.0.9; 3.0 versions above and including 3.0.0, prior to 3.0.2.

Status

Package Ubuntu Release Status
lxc 18.04 LTS bionic
Fixed 3.0.1-0ubuntu1~18.04.2
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Severity score breakdown

Parameter Value
Base score 3.3 · Low
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

Other references