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CVE-2026-19624— NetworkManager-l2tp: local privilege escalation via ipsec.conf injection

Quick assessment

Affected
CVE-2026-19624
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.

NetworkManager-l2tp 中存在一个缺陷。该插件将攻击者可控的 VPN 连接属性（即 vpn.data 和 vpn.secrets 的值）未经转义地写入生成的 ipsec.conf 文件，而该文件会被以 root 权限加载并供 pluto 使用。本地非特权用户可以创建并激活一个包含通过换行符注入的 指令的 L2TP VPN 配置；当建立 IKE 安全关联时，pluto 会以 root 身份执行该指令，从而导致本地权限提升。此漏洞属于与 CVE-2018-10900（NetworkManager-vpn

CVSS 7.8 · High

Possible ATT&CK Techniques 1 AI

T1078.003 · Local Accounts

I. Basic Information for CVE-2026-19624

Vulnerability Information
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Vulnerability Title
NetworkManager-l2tp: local privilege escalation via ipsec.conf injection
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in NetworkManager-l2tp. The plugin writes attacker-controlled VPN connection properties (vpn.data and vpn.secrets values) unescaped into a generated ipsec.conf file that pluto loads as root. A local unprivileged user can create and activate their own L2TP VPN profile containing a newline-injected leftupdown directive; pluto executes that command as root when the IKE security association is established, resulting in local privilege escalation. This is the same bug class as CVE-2018-10900 (NetworkManager-vpnc).
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
参数注入或修改
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 1.0.0 ~ 1.0.16 -
Fedora Fedora 1.52.0 ~ 1.52.4 -
Fedora Extra Packages for Enterprise Linux (EPEL) 1.20.0 ~ 1.20.24 -

II. Public POCs for CVE-2026-19624

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-19624

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Patches & Fixes for CVE-2026-19624 (2)

Vendor Pages for CVE-2026-19624 (1)

Other References for CVE-2026-19624 (1)

IV. Related Vulnerabilities

Same weakness: CWE-88

V. Comments for CVE-2026-19624

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