CVE-2026-3888

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.

SeverityHigh

CVSS7.8

Exploit probability—

ProductCanonical Ubuntu Linux

PublishedMar 17, 2026

First seenMar 17, 2026

Weakness typeCWE-268CWE-268

How to fix

Vendor advisories

ubuntu.com/security/notices/USN-8102-1
discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888

Affected products

Product	Affected versions	Fixed in
canonical ubuntu_linux	16.04, 18.04, 20.04, 22.04, 24.04	—

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