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.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
High
Difficult to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 6
https://ubuntu.com/security/CVE-2026-3888
security@ubuntu.com
https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-388…
security@ubuntu.com
https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt
security@ubuntu.com
https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888
security@ubuntu.com
https://ubuntu.com/security/notices/USN-8102-1
security@ubuntu.com
http://www.openwall.com/lists/oss-security/2026/03/18/1
af854a3a-2127-422b-91ae-364da2661108