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Vulnerability record · CVE-2018-6556 · published 10 August 2018

CVE-2018-6556: Canonical ubuntu linux vulnerability

Canonical · Ubuntu Linux

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.

3.3 CVSS 3.0 Low EPSS 0.33% · top 76.1% CWE-417 · CWE-417
3.3CVSS 3.0 base score, v2 2.1
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00074.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00076.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00091.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00073.html
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591 Issue TrackingThird Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=988348 Issue TrackingPatch
https://security.gentoo.org/glsa/201808-02 Third Party Advisory
https://usn.ubuntu.com/usn/usn-3730-1 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00074.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00076.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00091.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00073.html
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591 Issue TrackingThird Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=988348 Issue TrackingPatch
https://security.gentoo.org/glsa/201808-02 Third Party Advisory
https://usn.ubuntu.com/usn/usn-3730-1 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-6556), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.