Local Privilege Escalation in snapd

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Summary

CVECVE-2026-3888
StatePUBLISHED
Assignercanonical
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-17 14:16:17 UTC
Updated2026-06-04 14:43:01 UTC
DescriptionLocal 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.000090000 probability, percentile 0.010810000 (date 2026-06-08)

Problem Types: CWE-268 | CWE-268 CWE-268 Privilege chaining

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNACVSS7.8HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Canonical Ubuntu Linux 18.04 All All All
Operating System Canonical Ubuntu Linux 20.04 All All All
Operating System Canonical Ubuntu Linux 22.04 All All All
Operating System Canonical Ubuntu Linux 24.04 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Canonical Ubuntu 16.04 LTS unaffected 2.61.4ubuntu0.16.04.1+esm2 * dpkg Linux
CNA Canonical Ubuntu 18.04 LTS unaffected 2.61.4ubuntu0.18.04.1+esm2 * dpkg Linux
CNA Canonical Ubuntu 20.04 LTS unaffected 2.67.1+20.04ubuntu1~esm1 * dpkg Linux
CNA Canonical Ubuntu 22.04 LTS unaffected 2.73+ubuntu22.04.1 * dpkg Linux
CNA Canonical Ubuntu 24.04 LTS unaffected 2.73+ubuntu24.04.2 * dpkg Linux

References

ReferenceSourceLinkTags
ubuntu.com/security/notices/USN-8102-1 [email protected] ubuntu.com Third Party Advisory
www.openwall.com/lists/oss-security/2026/03/18/1 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
cdn2.qualys.com/advisory/2026/03/17/snap-confine-systemd-tmpfiles.txt [email protected] cdn2.qualys.com Third Party Advisory
blog.qualys.com/vulnerabilities-threat-research/2026/03/17/cve-2026-3888-impo... [email protected] blog.qualys.com Mitigation, Third Party Advisory
discourse.ubuntu.com/t/snapd-local-privilege-escalation-cve-2026-3888 [email protected] discourse.ubuntu.com Mitigation, Third Party Advisory
ubuntu.com/security/CVE-2026-3888 [email protected] ubuntu.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Qualys Security Advisory Team (en)

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