TI-2026-12816 Aliases CVE-2026-15226 GHSA-9pj8-7m3m-mh5h

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

LOW 38CWE-250Published 2026-07-21 · Updated 2026-07-22

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Privilege escalation
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-250.

Summary

A 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00184 8th percentileScored 2026-11-07

Fix Fixed snapd: 2.76.1Ubuntu 26.04 LTS (Canonical): 2.76+ubuntu26.04.3+5 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	snapd	before 2.76.1	2.76.1	Patch available	CNA
Canonical	Ubuntu 26.04 LTS	—	2.76+ubuntu26.04.3	Patch available	CNA
Canonical	Ubuntu 24.04 LTS	—	2.76+ubuntu24.04.1	Patch available	CNA
Canonical	Ubuntu 22.04 LTS	—	2.76+ubuntu22.04.1	Patch available	CNA
Canonical	Ubuntu 20.04 LTS	—	2.67.1+20.04ubuntu1~esm2	Patch available	CNA
Canonical	Ubuntu 18.04 LTS	—	2.61.4ubuntu0.18.04.1+esm3	Patch available	CNA
Canonical	Ubuntu 16.04 LTS	—	2.61.4ubuntu0.16.04.1+esm3	Patch available	CNA

snapd Vendor— Affected before 2.76.1 Fixed in 2.76.1 Patch available CNA
Ubuntu 26.04 LTS VendorCanonical Affected — Fixed in 2.76+ubuntu26.04.3 Patch available CNA
Ubuntu 24.04 LTS VendorCanonical Affected — Fixed in 2.76+ubuntu24.04.1 Patch available CNA
Ubuntu 22.04 LTS VendorCanonical Affected — Fixed in 2.76+ubuntu22.04.1 Patch available CNA
Ubuntu 20.04 LTS VendorCanonical Affected — Fixed in 2.67.1+20.04ubuntu1~esm2 Patch available CNA
Ubuntu 18.04 LTS VendorCanonical Affected — Fixed in 2.61.4ubuntu0.18.04.1+esm3 Patch available CNA
Ubuntu 16.04 LTS VendorCanonical Affected — Fixed in 2.61.4ubuntu0.16.04.1+esm3 Patch available CNA

Remediation

Fix · CNA snapd Fixed in 2.76.1
Fix · CNA Ubuntu 26.04 LTS (Canonical) Fixed in 2.76+ubuntu26.04.3
Fix · CNA Ubuntu 24.04 LTS (Canonical) Fixed in 2.76+ubuntu24.04.1
Fix · CNA Ubuntu 22.04 LTS (Canonical) Fixed in 2.76+ubuntu22.04.1
Fix · CNA Ubuntu 20.04 LTS (Canonical) Fixed in 2.67.1+20.04ubuntu1~esm2
Fix · CNA Ubuntu 18.04 LTS (Canonical) Fixed in 2.61.4ubuntu0.18.04.1+esm3
Fix · CNA Ubuntu 16.04 LTS (Canonical) Fixed in 2.61.4ubuntu0.16.04.1+esm3

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-15226
2026-10-03 Alias added: GHSA-9pj8-7m3m-mh5h

References

Other 1

https://ubuntu.com/security/CVE-2026-15226

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Sources

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