CVE-2026-3888

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

17/03/2026

Last modified:

18/03/2026

Description

Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap&#39;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.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.80

Severity 3.x

HIGH

References to Advisories, Solutions, and Tools

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