Vulnerability in NetworkManager-l2tp (CVE-2026-75131)
Summary
Vulnerability in NetworkManager-l2tp (CVE-2026-75131). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 1.52.6 or later.
Original description
The description as published by the source.
NetworkManager-l2tp through 1.52.4, fixed in 1.52.6, contains a privilege escalation vulnerability that allows local users with permission to create VPN connections to execute arbitrary code as root by injecting pppd options through a crafted VPN username. Attackers can embed a double-quote character or whitespace in the username to break out of the pppd options file quoting context and include the pppd plugin directive, causing the privileged pppd process to load an attacker-controlled shared object.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-75131 has been found in NetworkManager-l2tp.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: upgrade NetworkManager-l2tp to 1.52.6 or later.
If unsure, ask your IT team or search "NetworkManager-l2tp CVE-2026-75131" on the vendor's site.
CVE-2026-75131 (NetworkManager-l2tp) — CWE-88 / CVSS v3 7.8
Attack vector: local / no user interaction
Patched: 1.52.6 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-88) exists in NetworkManager-l2tp.
Check the vendor advisory for the affected versions of NetworkManager-l2tp.
Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.
Update to 1.52.6.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'NetworkManager-l2tp' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'NetworkManager-l2tp' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
NetworkManager-l2tpを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade NetworkManager-l2tp to 1.52.6ステージング環境で 1.52.6 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- web github.com
- web disclosure@vulncheck.com