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CVE-2026-15226— snapd snap-confine Sandbox Confinement Bypass via Omission of setuid Restriction in Seccomp Templates

Quick assessment

Affected
CVE-2026-15226
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Canonical snapd是英国Canonical公司开源的一个跨平台包管理工具。 Canonical snapd 2.76.1之前版本存在权限许可和访问控制问题漏洞，该漏洞源于内部执行环境编译器（snap-confine）中的seccomp安全模板未过滤或拒绝具有set-user-ID属性的文件执行标志操作，可能导致沙箱内的恶意进程绕过沙箱限制、丢弃预期限制策略或执行特权操作。

CVSS 8.4 · High EPSS 0.18% · P7

Affected Version Matrix 7

VendorProduct Version RangeStatus
None None < 2.76.1 affected
Canonical Ubuntu 16.04 LTS 2.61.4ubuntu0.16.04.1+esm3 unaffected
Canonical Ubuntu 18.04 LTS 2.61.4ubuntu0.18.04.1+esm3 unaffected
Canonical Ubuntu 20.04 LTS 2.67.1+20.04ubuntu1~esm2 unaffected
Canonical Ubuntu 22.04 LTS 2.76+ubuntu22.04.1 unaffected
Canonical Ubuntu 24.04 LTS 2.76+ubuntu24.04.1 unaffected
Canonical Ubuntu 26.04 LTS 2.76+ubuntu26.04.3 unaffected

I. Basic Information for CVE-2026-15226

Vulnerability Information
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Vulnerability Title
snapd snap-confine Sandbox Confinement Bypass via Omission of setuid Restriction in Seccomp Templates
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
带着不必要的权限执行
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical snapd 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical snapd是英国Canonical公司开源的一个跨平台包管理工具。 Canonical snapd 2.76.1之前版本存在权限许可和访问控制问题漏洞，该漏洞源于内部执行环境编译器（snap-confine）中的seccomp安全模板未过滤或拒绝具有set-user-ID属性的文件执行标志操作，可能导致沙箱内的恶意进程绕过沙箱限制、丢弃预期限制策略或执行特权操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 2.76.1 -
Canonical Ubuntu 26.04 LTS 2.76+ubuntu26.04.3 -
Canonical Ubuntu 24.04 LTS 2.76+ubuntu24.04.1 -
Canonical Ubuntu 22.04 LTS 2.76+ubuntu22.04.1 -
Canonical Ubuntu 20.04 LTS 2.67.1+20.04ubuntu1~esm2 -
Canonical Ubuntu 18.04 LTS 2.61.4ubuntu0.18.04.1+esm3 -
Canonical Ubuntu 16.04 LTS 2.61.4ubuntu0.16.04.1+esm3 -

II. Public POCs for CVE-2026-15226

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III. Intelligence Information for CVE-2026-15226

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Vendor Advisories for CVE-2026-15226 (1)

IV. Related Vulnerabilities

Same weakness: CWE-250

V. Comments for CVE-2026-15226

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