Vulnerability in Canonical Ubuntu 16.04 Lts
CVE-2026-3888
Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap's private /tmp directory when systemd-tmpfiles is configured to automatically clean up this directory. This issue affects Ubuntu…
EPSS: 0.000 (0.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Canonical Ubuntu 16.04 Lts — versions 2.61.4ubuntu0.16.04.1+esm2
- Canonical Ubuntu 18.04 Lts — versions 2.61.4ubuntu0.18.04.1+esm2
- Canonical Ubuntu 20.04 Lts — versions 2.67.1+20.04ubuntu1~esm1
- Canonical Ubuntu 22.04 Lts — versions 2.73+ubuntu22.04.1
- Canonical Ubuntu 24.04 Lts — versions 2.73+ubuntu24.04.2
- Canonical Ubuntu_linux — versions 16.04, 18.04, 20.04
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@ubuntu.com (issue-tracking, Third Party Advisory, vdb-entry)
- security@ubuntu.com (vendor-advisory, Third Party Advisory)
- security@ubuntu.com (vendor-advisory, technical-description, Third Party Advisory, Mitigation)
- security@ubuntu.com (technical-description, Third Party Advisory, Mitigation, media-coverage)
- security@ubuntu.com (technical-description, Third Party Advisory, media-coverage)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-3888?
- CVE-2026-3888 is a high-severity vulnerability in Canonical Ubuntu 16.04 Lts, classified under Privilege Chaining. CVSS score: 7.8/10. Published 2026-03-17.
- How severe is CVE-2026-3888?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2026-3888 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.