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CVE-2026-8933— snap-confine Local Privilege Escalation via Capabilities Misconfiguration or Flaw in Execution Environment Setup

Quick assessment

Affected
CVE-2026-8933
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 2.75.0版本至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snap-confine组件初始化权限边界或安全沙箱时存在缺陷，可能导致本地低权限攻击者绕过限制并执行任意代码，成功利用此漏洞可将权限提升至root。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068.001

Affected Version Matrix 4

VendorProduct Version RangeStatus
None None 2.75.0< 2.76.1 affected
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-2026-8933

Vulnerability Information
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Vulnerability Title
snap-confine Local Privilege Escalation via Capabilities Misconfiguration or Flaw in Execution Environment Setup
Source: CVE Program / CVE List V5
Vulnerability Description
A local privilege escalation vulnerability exists in snap-confine, a set-capabilities core component used internally by Canonical snapd to construct the secure execution environment for snap applications. This vulnerability uniquely affects versions of snap-confine configured with set-capabilities (rather than standard set-uid-root installations). Due to a flaw in how privilege boundaries or security sandboxes are initialized when the binary runs under limited ambient capabilities, a local, unprivileged attacker can exploit this behavior to bypass intended restrictions and execute arbitrary code. Successful exploitation allows the local user to elevate their privileges to full root authority.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 2.75.0版本至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snap-confine组件初始化权限边界或安全沙箱时存在缺陷，可能导致本地低权限攻击者绕过限制并执行任意代码，成功利用此漏洞可将权限提升至root。
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
- - 2.75.0 ~ 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 -

II. Public POCs for CVE-2026-8933

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III. Intelligence Information for CVE-2026-8933

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Vendor Advisories for CVE-2026-8933 (1)

IV. Related Vulnerabilities

Same weakness: CWE-250

V. Comments for CVE-2026-8933

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