CVE-2026-3888

HighPublished

Local Privilege Escalation in snapd

Published: Mar 17, 2026
Updated: Mar 18, 2026
Assigning CNA: canonical
Evidence observed: Aug 25, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 39.7%
Model date: Oct 17, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

Repository evidence: Files: 1 · Repositories: 1

1 Module

Local Privilege Escalation in snapdModule
modules/exploits/linux/local/cve_2026_3888.rb
Metasploit Framework modules
ExploitEvidence observed: Oct 8, 2026Revision: b22ce1fbae63Related tool
Declared conditions
- platform: Linux($.exploit_linux/local/cve_2026_3888.platform)
- verification: check_declared($.exploit_linux/local/cve_2026_3888.check)

HTB-Snapped-WriteupResearch
HTB Snapped — Hard Linux machine writeup. CVE-2026-27944 (Nginx UI unauthenticated backup disclosure) chained with CVE-2026-3888 (snapd race condition LPE) to achieve full system compromise.
CVE-2026-3888

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