A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine).
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.
A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine).
Description
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.
CVSS v3.1
Affected software
pkg:deb/ubuntu/[email protected]+esm4?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]+esm4?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]+20.04ubuntu1~esm3?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]+ubuntu22.04.1?arch=source&distro=jammypkg:deb/ubuntu/[email protected]+ubuntu24.04.1?arch=source&distro=noblepkg:deb/ubuntu/[email protected]+ubuntu26.04.3?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-15226
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a600ab19c2644c7f8fe1c7d
Added to database: 07/22/2026, 00:11:29 UTC
Last updated: 07/26/2026, 22:37:03 UTC
Views: 24
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