Local Privilege Escalation in snapd
Published Mar 17, 2026
7.8
HIGHCVSS 3.1
EPSS 0.18%
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.
Affected products
No data.
- 16.04
- 18.04
- 20.04
- 22.04
- 24.04
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Mar 17, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Mar–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.18% (0.00177) | 6.58th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.38% (0.00383) | 29.86th | v5 (v2026.06.15) |
| Mar 18, 2026 | 0.01% (0.00006) | 0.34th | v4 (v2025.03.14) |
References (6)
- http://www.openwall.com/lists/oss-security/2026/03/18/1 Mailing ListThird Party Advisory
- https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root technical-descriptionmedia-coverageMitigationThird Party Advisory
- https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt technical-descriptionmedia-coverageThird Party Advisory
- https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888 technical-descriptionvendor-advisoryMitigationThird Party Advisory
- https://ubuntu.com/security/CVE-2026-3888 vdb-entryissue-trackingThird Party Advisory
- https://ubuntu.com/security/notices/USN-8102-1 vendor-advisoryThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2026/03/18/1 | Mailing ListThird Party Advisory | |
| https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root | technical-descriptionmedia-coverageMitigationThird Party Advisory | |
| https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt | technical-descriptionmedia-coverageThird Party Advisory | |
| https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888 | technical-descriptionvendor-advisoryMitigationThird Party Advisory | |
| https://ubuntu.com/security/CVE-2026-3888 | vdb-entryissue-trackingThird Party Advisory | |
| https://ubuntu.com/security/notices/USN-8102-1 | vendor-advisoryThird Party Advisory |
Change history (0)
No recorded changes yet.