CVE-2026-3888

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.

CVSS v3.1

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

EPSS

0.38% chance of exploitation in the next 30 days, 31th percentile

Published

2026-03-17

Updated

2026-03-18

Proof-of-concept exploits (7)

• netw0rk7/CVE-2026-3888-PoC3★ · 2026-03-23
• fevar54/CVE-2026-3888-POC-all-from-the-Qualys-platform.2★ · 2026-03-18
• Many-Hat-Group/Ubuntu-CVE-2026-3888-patcher0★ · 2026-03-19
• TheCyberGeek/CVE-2026-3888-snap-confine-systemd-tmpfiles-LPE17★ · 2026-03-23
• noambouillet/CVE-2026-38885★ · 2026-04-02
• DanielTangnes/CVE-2026-38880★ · 2026-05-19
• Rebick/CVEs_exploit0★ · 2026-05-13

References

• CVE Record
• NVD entry

Related

• CVE-2023-21839
• CVE-2023-43654
• CVE-2024-21182
• CVE-2024-3094
• CVE-2024-42461
• CVE-2025-20343