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CVE-2026-3888
Local Privilege Escalation in snapd
High7.8EPSS 1.4%
- Published
- Updated
- Reserved
- Assigned by
- canonical
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
ID reserved
By canonical
- 7 days later
· 7 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| canonicalCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 1.4% · top 27% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
snapd
- affected < 2.75.1
- unaffected 2.61.4ubuntu0.16.04.1+esm2 – < *
- unaffected 2.61.4ubuntu0.18.04.1+esm2 – < *
- unaffected 2.67.1+20.04ubuntu1~esm1 – < *
- unaffected 2.73+ubuntu22.04.1 – < *
- unaffected 2.73+ubuntu24.04.2 – < *
References (6)
- https://ubuntu.com/security/CVE-2026-3888 (opens in a new tab)vdb-entryissue-tracking
- https://ubuntu.com/security/notices/USN-8102-1 (opens in a new tab)vendor-advisory
- https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888 (opens in a new tab)technical-descriptionvendor-advisory
- https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root (opens in a new tab)technical-descriptionmedia-coverage
- https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt (opens in a new tab)technical-descriptionmedia-coverage
- http://www.openwall.com/lists/oss-security/2026/03/18/1 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-3888)Record last updated .