snapd snap-confine Sandbox Confinement Bypass via Omission of setuid Restriction in Seccomp Templates

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-15226
StatePUBLISHED
Assignercanonical
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-21 15:16:31 UTC
Updated2026-07-22 19:16:54 UTC
DescriptionA sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine). The default seccomp security templates generated by the engine to restrict system calls do not filter or reject process operations capable of creating or manipulating file execution flags with set-user-ID attributes. Consequently, an application running within a strictly confined snap environment can successfully compile or drop binaries and apply setuid properties to them. If a compromised or malicious process inside the snap sandbox executes these generated setuid binaries, it can potentially circumvent architectural sandboxing assumptions, drop intended restriction policies, or execute privileged actions inside the container namespace that should otherwise be strictly blocked. The vulnerability has been resolved by hardening the seccomp template engine to block the execution and creation of setuid executables by sandboxed snap processes.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from [email protected]

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

EPSS: 0.001250000 probability, percentile 0.026270000 (date 2026-07-22)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.4HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNACVSS8.4HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

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
CNA Canonical Ubuntu 20.04 LTS unaffected 2.67.1+20.04ubuntu1~esm2 dpkg Linux
CNA Canonical Ubuntu 18.04 LTS unaffected 2.61.4ubuntu0.18.04.1+esm3 dpkg Linux
CNA Canonical Ubuntu 16.04 LTS unaffected 2.61.4ubuntu0.16.04.1+esm3 Linux

References

ReferenceSourceLinkTags
ubuntu.com/security/CVE-2026-15226 [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: Zygmunt Krynicki (en)

© CVE.report 2026

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