Low
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-6556
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:38 UTC · Revision 1
Source evidence
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.
osv:CVE-2018-6556
Complete source record
{
"id": "87fc076539afb7ecad71fb7d70e4ed0bf7b1317540836be53ba9738bef293b95",
"url": "https://osv.dev/vulnerability/CVE-2018-6556",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-6556",
"summary": "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.",
"evidence": "osv:CVE-2018-6556",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2018-6556",
"aliases": [
"CVE-2018-6556"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/lxc/lxc",
"type": "GIT",
"events": [
{
"introduced": "823765e50bf4df2f2365bd2590768676634919b7"
},
{
"last_affected": "5dafcdd9bbc1f224d715540c681d2626cb2d5699"
},
{
"introduced": "5b66b6ee3e3cd2575a4b9b2eb8190b2b05ab4b42"
},
{
"fixed": "56fb4efa7a2f2e45b46177785e1fa62978e3ff34"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:linuxcontainers:lxc:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.0.0"
},
{
"last_affected": "2.0.9"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:linuxcontainers:lxc:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.0"
},
{
"fixed": "3.0.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"lxc-3.0.1",
"lxc-3.0.0",
"lxc-2.0.9",
"lxc-2.0.8",
"lxc-2.0.7",
"lxc-2.0.6",
"lxc-2.0.5",
"lxc-2.0.4",
"lxc-2.0.3",
"lxc-2.0.2",
"lxc-2.0.1",
"lxc-2.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-6556.json"
}
}
],
"modified": "2026-10-24T10:30:42.416648956Z",
"provider": "osv",
"references": [
"https://security.gentoo.org/glsa/201808-02",
"https://usn.ubuntu.com/usn/usn-3730-1",
"https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1783591",
"https://bugzilla.suse.com/show_bug.cgi?id=988348"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*"
],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
{
"introduced": "15.0"
},
{
"last_affected": "15.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:suse:caas_platform:1.0:*:*:*:*:*:*:*",
"cpe:2.3:a:suse:caas_platform:2.0:*:*:*:*:*:*:*"
],
"vendor_product": "suse:caas_platform",
"extracted_events": [
{
"range": [
{
"introduced": "1.0"
},
{
"last_affected": "1.0"
},
{
"introduced": "2.0"
},
{
"last_affected": "2.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:suse:openstack_cloud:6:*:*:*:*:*:*:*"
],
"vendor_product": "suse:openstack_cloud",
"extracted_events": [
{
"range": [
{
"introduced": "6"
},
{
"last_affected": "6"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp3:*:*:ltss:*:*:*",
"cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp4:*:*:*:*:*:*"
],
"vendor_product": "suse:suse_linux_enterprise_server",
"extracted_events": [
{
"range": [
{
"introduced": "11-sp3"
},
{
"last_affected": "11-sp3"
},
{
"introduced": "11-sp4"
},
{
"last_affected": "11-sp4"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-6556",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 435375,
"published_at": "2018-08-10T15:29:01.297+00:00"
}