CVE-2026-15226

Sandbox escape via unrestricted setuid executable creation

Published Jul 21, 2026 · Updated Jul 21, 2026

Sandbox escape in Canonical snapd allows local users in strictly confined snaps to create and execute setuid binaries. The snap-confine default seccomp template omits restrictions on creating executables with set-user-ID attributes, so confined processes can apply those attributes. Exploitation requires code execution inside a strictly confined snap and grants privileged actions beyond the intended sandbox boundary.

CVSS severity8.4
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in Canonical snapd allows local users in strictly confined snaps to create and execute setuid binaries. The snap-confine default seccomp template omits restrictions on creating executables with set-user-ID attributes, so confined processes can apply those attributes. Exploitation requires code execution inside a strictly confined snap and grants privileged actions beyond the intended sandbox boundary.

The record

CVE
CVE-2026-15226
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Canonical
Product
Ubuntu 22.04 LTS
Classifications
CWE-250, CAPEC-122, T1548.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Canonical · Ubuntu 22.04 LTSAffected versions are unavailable in this record.
Canonical · Ubuntu 18.04 LTSAffected versions are unavailable in this record.
Canonical · Ubuntu 24.04 LTSAffected versions are unavailable in this record.
Canonical · Ubuntu 16.04 LTSAffected versions are unavailable in this record.
Canonical · Ubuntu 20.04 LTSAffected versions are unavailable in this record.
Canonical · Ubuntu 26.04 LTSAffected versions are unavailable in this record.
Canonical · snapdversion=0 <2.76.1

Published CVSS scores

8.4CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-250Execution with Unnecessary Privileges
CAPEC-122Privilege Abuse
T1548.001Setuid and Setgid

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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