Vulnerability record · CVE-2026-3888 · published 17 March 2026

CVE-2026-3888: Canonical ubuntu linux vulnerability

Canonical · Ubuntu Linux

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 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and 24.04 LTS.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.4% CWE-268 · CWE-268

7.8CVSS 3.1 base score

0.18%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

6References

17 Jun 2026Last modified by NVD

Description

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Ubuntu Linux Canonical

References

Link	Tags
https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privi	MitigationThird Party Advisory
https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt	Third Party Advisory
https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888	MitigationThird Party Advisory
https://ubuntu.com/security/CVE-2026-3888	Third Party Advisory
https://ubuntu.com/security/notices/USN-8102-1	Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/03/18/1	Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-3888), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.