CVE-2026-3888
high
CVSS v3
7.8
CVSS v4 NEW
—
VIR risk
7.8
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.
Predictions
Exploit likelihood
75%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Ubuntu Affected 5 releases
| Version | Status | Fixed in |
|---|---|---|
| 24.04 | Affected | — |
| 22.04 | Affected | — |
| 20.04 | Affected | — |
| 18.04 | Affected | — |
| 16.04 | Affected | — |
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2.68.3-3+deb13u1 |
| sid | Affected | — |
| forky | Affected | — |
| bullseye | Affected | — |
| bookworm | Fixed | 2.57.6-1+deb12u1 |
References
- https://security-tracker.debian.org/tracker/CVE-2026-3888
- https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root
- https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt
- https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888
- https://ubuntu.com/security/CVE-2026-3888
- https://ubuntu.com/security/notices/USN-8102-1
- http://www.openwall.com/lists/oss-security/2026/03/18/1
CWEs
CWE-268
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.