3.3

CVE-2018-6556: The lxc-user-nic component of LXC allows unprivileged users to open arbitrary files

Modified
AliasesALPINE-CVE-2018-6556openSUSE-SU-2019:1230-1UBUNTU-CVE-2018-6556
Published 10-08-2018Last modified 17-09-2024

Vulnerability summary

CVE-2018-6556 is a low (CVSS 3.3) Communication Channel Errors vulnerability in canonical ubuntu_linux. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 28.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.3, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
3.3/10
010
Low · v3.0 (NVD)
EPSS score
0.35%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
OPENSUSE-SU-2019:1227-1OPENSUSE-SU-2019:1275-1OPENSUSE-SU-2024:11030-1

Timeline

  1. 10-08-2018
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

28%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.33% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse4 products
Alpine1 product
  • lxc≥ 2.0.0, < 2.1.1-r9 | ≥ 2.0.0, < 2.0.9-r1 | ≥ 2.0.0, < 2.1.1-r3
Canonical1 product
Debian1 product
  • lxc< 1:2.0.9-6.1
Linuxcontainers1 product
  • lxc≥ 2.0.0, ≤ 2.0.9 | ≥ 3.0.0, < 3.0.2
Opensuse1 product
Ubuntu1 product
  • lxc< 3.0.1-0ubuntu1~18.04.2

7 vendors · 10 products

References

16 links
Show all 16 references