CVE-2026-3888

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-03-17. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
30.3%
KEV
Not listed

Published

March 17, 2026

Last Modified

June 4, 2026

Advisory Details (6)

Auto-updated Jun 4, 2026
🔬 Proof of concept available. Patch available. Sources: ubuntu.
generic

oss-security - Re: snap-confine + systemd-tmpfiles = root (CVE-2026-3888)

http://www.openwall.com/lists/oss-security/2026/03/18/1
ubuntu Patch Available

USN-8102-1: snapd vulnerability | Ubuntu security notices | Ubuntu

https://ubuntu.com/security/notices/USN-8102-1
ubuntu Patch Available

CVE-2026-3888 | Ubuntu

Affected: Ubuntu 16.04 LTS, 18.04 LTS, 20.04 LTS, 22.04 LTS, and

https://ubuntu.com/security/CVE-2026-3888
generic

Snapd - Local Privilege Escalation (CVE-2026-3888) - Security - Ubuntu Community Hub

https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888
generic🟡 PoC Available
https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt
generic

CVE-2026-3888: Important Snap Flaw Enables Local Privilege Escalation to Root | Qualys

https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuubuntu-snappy-cli (2.61.4ubuntu0.16.04.1+esm2) @ xenial2026-06-11ubuntu
ubuntuubuntu-snappy-cli (2.73+ubuntu24.04.2) @ noble2026-06-11ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
  4. 2026-07-07 13:46 UTCEPSS rescore
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-01 15:06 UTCEPSS rescore
  12. 2026-06-30 23:22 UTCEPSS rescore
  13. 2026-06-29 14:06 UTCEPSS rescore
  14. 2026-06-28 14:07 UTCEPSS rescore
  15. 2026-06-28 04:56 UTCEPSS rescore
  16. 2026-06-27 03:08 UTCEPSS rescore
  17. 2026-06-25 13:49 UTCEPSS rescore
  18. 2026-06-25 13:49 UTCEPSS rescore
  19. 2026-06-24 14:05 UTCEPSS rescore
  20. 2026-06-23 21:33 UTCEPSS rescore
  21. 2026-06-22 14:25 UTCEPSS rescore
  22. 2026-06-22 14:25 UTCEPSS rescore
  23. 2026-06-21 14:56 UTCEPSS rescore
  24. 2026-06-21 14:56 UTCEPSS rescore
  25. 2026-06-21 01:59 UTCEPSS rescore
Show 45 more
  1. 2026-06-19 19:25 UTCEPSS rescore
  2. 2026-06-18 17:52 UTCEPSS rescore
  3. 2026-06-18 17:52 UTCEPSS rescore
  4. 2026-06-17 17:53 UTCEPSS rescore
  5. 2026-06-16 17:52 UTCEPSS rescore
  6. 2026-06-15 17:49 UTCEPSS rescore
  7. 2026-06-13 23:00 UTCEPSS rescore
  8. 2026-06-12 23:12 UTCEPSS rescore
  9. 2026-06-12 23:12 UTCEPSS rescore
  10. 2026-06-11 23:53 UTCEG score recompute
  11. 2026-06-11 23:53 UTCVendor advisory
  12. 2026-06-11 23:53 UTCGHSA enrichment
  13. 2026-06-11 14:00 UTCEPSS rescore
  14. 2026-06-10 22:18 UTCEPSS rescore
  15. 2026-06-10 18:15 UTCEG score recompute
  16. 2026-06-10 18:15 UTCVendor advisory
  17. 2026-06-10 18:15 UTCGHSA enrichment
  18. 2026-06-10 13:22 UTCEPSS rescore
  19. 2026-06-10 13:22 UTCEPSS rescore
  20. 2026-06-10 05:49 UTCEG score recompute
  21. 2026-06-10 05:49 UTCVendor advisory
  22. 2026-06-10 05:49 UTCGHSA enrichment
  23. 2026-06-09 16:37 UTCEG score recompute
  24. 2026-06-09 16:37 UTCVendor advisory
  25. 2026-06-09 16:37 UTCGHSA enrichment
  26. 2026-06-08 14:17 UTCEPSS rescore
  27. 2026-06-08 14:17 UTCEPSS rescore
  28. 2026-06-08 02:43 UTCEG score recompute
  29. 2026-06-08 02:43 UTCVendor advisory
  30. 2026-06-08 02:43 UTCGHSA enrichment
  31. 2026-06-07 15:25 UTCEPSS rescore
  32. 2026-06-07 15:25 UTCEPSS rescore
  33. 2026-06-07 15:25 UTCEPSS rescore
  34. 2026-06-07 14:29 UTCEG score recompute
  35. 2026-06-07 14:29 UTCVendor advisory
  36. 2026-06-07 14:29 UTCGHSA enrichment
  37. 2026-06-06 13:47 UTCEPSS rescore
  38. 2026-06-06 13:47 UTCEPSS rescore
  39. 2026-06-05 22:47 UTCEPSS rescore
  40. 2026-06-05 22:47 UTCEPSS rescore
  41. 2026-06-05 06:10 UTCEPSS rescore
  42. 2026-06-05 06:10 UTCEPSS rescore
  43. 2026-06-04 15:14 UTCEG score recompute
  44. 2026-06-04 15:14 UTCVendor advisory
  45. 2026-06-04 15:14 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-3888?
CVE-2026-3888 is a high vulnerability published on March 17, 2026. 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.
When was CVE-2026-3888 disclosed?
CVE-2026-3888 was first published in the National Vulnerability Database on March 17, 2026, with the most recent update on June 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-3888 actively exploited?
CVE-2026-3888 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-3888?
CVE-2026-3888 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-3888?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3888, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-3888

Explore →

Is Your Infrastructure Affected by CVE-2026-3888?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs