UBUNTU-CVE-2018-6954

Advisory lineage Upstream: 1 Downstream: 2
Upstream
CVE-2018-6954
Published: 13 Feb 2018, 00:00
Last modified:22 Apr 2026, 12:02

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

13 Feb 2018, 00:00
Published
Vulnerability first disclosed
22 Apr 2026, 12:02
Last Modified
Vulnerability information updated

Description

systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • v3.0•HIGH•Score: 7.8CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Systems

  • ubuntu•systemd

    < 229-4ubuntu21.15 | < 237-3ubuntu10.9

References (4)