Vulnerability Report

CVE-2026-3888

Title: Local Privilege Escalation in snapd

Auth Bypass

Proof Of Concept

PoC Available for CVE-2026-3888

CWE Category CWE-268
Published Date Mar 17, 2026
Modified Date Jun 04, 2026
Exploit Status Available
Score 7.8 CVSS v3.1
Exploit Probability (EPSS)
0.38%

Vulnerability Summary

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.

Impacted Vendors

U
ubuntu 1
C
canonical 1

Reference Links

https://ubuntu.com/security/CVE-2026-3888
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.8
Attack Vector
LOCAL
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-3888 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/fevar54/CVE-2026-3888-POC-all-from-the-Qualys-platform.
View Code
GitHub https://github.com/Many-Hat-Group/Ubuntu-CVE-2026-3888-patcher
View Code
GitHub https://github.com/netw0rk7/CVE-2026-3888-PoC
View Code
GitHub https://github.com/nomaisthere/CVE-2026-3888
View Code
MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector LOCAL
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected Stack

No specific products linked.