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Public proof of conceptFix available

CVE-2026-3888

A public proof of concept exists; no exploitation attested.

  • Published2026-03-17
  • WeaknessCWE-268

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-03-1714:16CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-3888?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-3888?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Canonical ubuntu linux
BranchAffectedFixed in
16.4= 16.04no fix published
18.4= 18.04no fix published
20.4= 20.04no fix published
22.4= 22.04no fix published
24.4= 24.04no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA6 products

As canonical, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-18

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • snapdUbuntu:Pro:20.04:LTSall versions · fixed in 2.67.1+20.04ubuntu1~esm1
  • snapdUbuntu:Pro:18.04:LTSall versions · fixed in 2.61.4ubuntu0.18.04.1+esm2
  • snapdUbuntu:Pro:16.04:LTSall versions · fixed in 2.61.4ubuntu0.16.04.1+esm2
  • snapdUbuntu:26.04:LTSall versions · fixed in 2.74.1+ubuntu26.04.3
  • snapdUbuntu:25.10all versions · fixed in 2.73+ubuntu25.10.1
  • snapdUbuntu:24.04:LTSall versions · fixed in 2.73+ubuntu24.04.2
  • snapdUbuntu:22.04:LTSall versions · fixed in 2.73+ubuntu22.04.1
  • snapdDebian:14all versions · fixed in 2.76-1

2 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
9 repositories, unverifiedfevar54/CVE-2026-3888-POC-all-from-the-Qualys-platform.Many-Hat-Group/Ubuntu-CVE-2026-3888-patchernetw0rk7/CVE-2026-3888-PoCTheCyberGeek/CVE-2026-3888-snap-confine-systemd-tmpfiles-LPEnoambouillet/CVE-2026-3888
PoC-in-GitHub
Metasploit modules
1 moduleexploit/linux/local/cve_2026_3888rank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
2026-03-17
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is 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.

Is CVE-2026-3888 actively exploited?

Active exploitation of CVE-2026-3888 has not been confirmed. Its EPSS score was 1.4% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-3888?

CVE-2026-3888 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

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Sources for this record