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CVE-2026-3888

Local Privilege Escalation in snapd

HIGH
7.8
CVSS Score
Published: March 17, 2026 at 02:02 PM UTC
Updated: June 17, 2026 at 10:44 AM UTC
2 products affected across 2 vendorsUbuntu LinuxSnapd

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Severity
HIGH7.8
Exploit prediction
EPSS 1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux· Canonicalrubygems
95%
16.0418.0420.0422.0424.04
Vendor states this is fixed in 2.61.4ubuntu0.16.04.1+esm2 (unaffected)
Vendor states this is fixed in 2.61.4ubuntu0.18.04.1+esm2 (unaffected)
Vendor states this is fixed in 2.67.1+20.04ubuntu1~esm1 (unaffected)
Vendor states this is fixed in 2.73+ubuntu22.04.1 (unaffected)
Vendor states this is fixed in 2.73+ubuntu24.04.2 (unaffected)
Snapd· Snapcraft
85%
All versions

References (6)

VDB EntryIssue TrackingThird Party Advisory
Source: [email protected]
https://ubuntu.com/security/CVE-2026-3888
Vendor AdvisoryThird Party Advisory
Source: cverecord
https://ubuntu.com/security/notices/USN-8102-1
Technical DescriptionVendor AdvisoryMitigationThird Party Advisory
Source: cverecord
https://discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888
Technical DescriptionPress/Media CoverageMitigationThird Party Advisory
Source: cverecord
https://blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-important-snap-flaw-enables-local-privilege-escalation-to-root
Technical DescriptionPress/Media CoverageThird Party Advisory
Source: cverecord
https://cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/03/18/1

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHcanonical
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-268

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