The lxc-user-nic component of LXC allows unprivileged users to open arbitrary files
Priority LOW 16CWE-417Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
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.
Why it matters now
EPSS 0.00347 28th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | LXC | 2.0.9 and later; 3.0.0 and later | — | No fix listed | CNA |
- LXC Vendor— Affected 2.0.9 and later; 3.0.0 and later Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:a:linuxcontainers:lxc:*:*:*:*:*:*:*:* | 2.0.0 – 2.0.9; 3.0.0 to before 3.0.2 | Vulnerable | lxc |
| cpe:2.3:a:suse:caas_platform:1.0:*:*:*:*:*:*:* | 1.0 | Vulnerable | SUSE |
| cpe:2.3:a:suse:caas_platform:2.0:*:*:*:*:*:*:* | 2.0 | Vulnerable | SUSE |
| cpe:2.3:a:suse:openstack_cloud:6:*:*:*:*:*:*:* | 6 | Vulnerable | SUSE |
| cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp3:*:*:ltss:*:*:* | 11 sp3 | Vulnerable | SUSE |
| cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp4:*:*:*:*:*:* | 11 sp4 | Vulnerable | SUSE |
| cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:* | 15.0 | Vulnerable | openSUSE |
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
- cpe:2.3:a:linuxcontainers:lxc:*:*:*:*:*:*:*:* Versions 2.0.0 – 2.0.9; 3.0.0 to before 3.0.2 Vulnerable ·lxc
- cpe:2.3:a:suse:caas_platform:1.0:*:*:*:*:*:*:* Versions 1.0 Vulnerable ·SUSE
- cpe:2.3:a:suse:caas_platform:2.0:*:*:*:*:*:*:* Versions 2.0 Vulnerable ·SUSE
- cpe:2.3:a:suse:openstack_cloud:6:*:*:*:*:*:*:* Versions 6 Vulnerable ·SUSE
- cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp3:*:*:ltss:*:*:* Versions 11 sp3 Vulnerable ·SUSE
- cpe:2.3:o:suse:suse_linux_enterprise_server:11:sp4:*:*:*:*:*:* Versions 11 sp4 Vulnerable ·SUSE
- cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:* Versions 15.0 Vulnerable ·openSUSE
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2018-6556
- 2026-10-03 Alias added: GHSA-xg68-6jxg-5w7p
References
Sources
- CVE-2018-6556 · CVE Program
- CVE-2018-6556 · NVD
- FIRST EPSS
- GHSA-xg68-6jxg-5w7p · GitHub Advisory Database · CC BY 4.0
- CVE-2018-6556 · Red Hat security data · CC BY 4.0
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