CVE-2026-3888

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.

Affected Platforms

Weakness Type

CWE-268

References

• https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888…
• 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