CVE-2026-3888
Last modified
CVE-2026-3888 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 20.04 |
| Canonical | Ubuntu Linux | 22.04 |
| Canonical | Ubuntu Linux | 24.04 |
References
- https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txtThird Party Advisory
- https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888Mitigation, Third Party Advisory
- https://ubuntu.com/security/CVE-2026-3888Third Party Advisory
- https://ubuntu.com/security/notices/USN-8102-1Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/18/1Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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