CVE-2026-3888
Publication date 17 March 2026
Last updated 25 March 2026
Ubuntu priority
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.
From the Ubuntu Security Team
Qualys discovered that snapd incorrectly handled certain operations in the snap's private /tmp directory. If systemd-tmpfiles is enabled to automatically clean up this directory, a local attacker could possibly use this issue to re-create the deleted directory, resulting in privilege escalation.
Why is this CVE high priority?
Local Privilege Escalation
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| snapd | 25.10 questing |
Fixed 2.73+ubuntu25.10.1
|
| 24.04 LTS noble |
Fixed 2.73+ubuntu24.04.2
|
|
| 22.04 LTS jammy |
Fixed 2.73+ubuntu22.04.1
|
|
| 20.04 LTS focal |
Fixed 2.67.1+20.04ubuntu1~esm1
|
|
| 18.04 LTS bionic |
Fixed 2.61.4ubuntu0.18.04.1+esm2
|
|
| 16.04 LTS xenial |
Fixed 2.61.4ubuntu0.16.04.1+esm2
|
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Get Ubuntu Pro 30-day free trialSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.8 · High
|
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Changed |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-8102-1
- snapd vulnerability
- 17 March 2026
- USN-8102-2
- snapd regression
- 17 March 2026