snap-confine Local Privilege Escalation via Capabilities Misconfiguration or Flaw in Execution Environment Setup

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-8933
StatePUBLISHED
Assignercanonical
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-21 15:16:39 UTC
Updated2026-07-22 19:17:14 UTC
DescriptionA local privilege escalation vulnerability exists in snap-confine, a set-capabilities core component used internally by Canonical snapd to construct the secure execution environment for snap applications. This vulnerability uniquely affects versions of snap-confine configured with set-capabilities (rather than standard set-uid-root installations). Due to a flaw in how privilege boundaries or security sandboxes are initialized when the binary runs under limited ambient capabilities, a local, unprivileged attacker can exploit this behavior to bypass intended restrictions and execute arbitrary code. Successful exploitation allows the local user to elevate their privileges to full root authority.

Risk And Classification

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

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

EPSS: 0.001450000 probability, percentile 0.042680000 (date 2026-07-22)

Problem Types: CWE-250 | CWE-250 CWE-250 Execution with unnecessary privileges

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

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Canonical Ubuntu 26.04 LTS unaffected 2.76+ubuntu26.04.3 dpkg Linux
CNA Canonical Ubuntu 24.04 LTS unaffected 2.76+ubuntu24.04.1 dpkg Linux
CNA Canonical Ubuntu 22.04 LTS unaffected 2.76+ubuntu22.04.1 dpkg Linux

References

ReferenceSourceLinkTags
ubuntu.com/security/CVE-2026-8933 [email protected] ubuntu.com
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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