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CVE

CWE

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CVE-2026-3888

Published: Mar 17, 2026

Modified: Mar 18, 2026

PUBLISHED

CVSS v3.1

7.8

HIGH

Description

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.

Vendor	Product	Versions
Unknown	snapd	affected `0 - < 2.75.1`
Canonical	Ubuntu 16.04 LTS	unaffected `2.61.4ubuntu0.16.04.1+esm2 - < *`
Canonical	Ubuntu 18.04 LTS	unaffected `2.61.4ubuntu0.18.04.1+esm2 - < *`
Canonical	Ubuntu 20.04 LTS	unaffected `2.67.1+20.04ubuntu1~esm1 - < *`
Canonical	Ubuntu 22.04 LTS	unaffected `2.73+ubuntu22.04.1 - < *`
Canonical	Ubuntu 24.04 LTS	unaffected `2.73+ubuntu24.04.2 - < *`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

References

https://ubuntu.com/security/CVE-2026-3888

vdb-entry

issue-tracking

https://ubuntu.com/security/notices/USN-8102-1

vendor-advisory

https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888

technical-description

vendor-advisory

https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root

technical-description

media-coverage

https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt

technical-description

media-coverage

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