NetworkManager-l2tp Privilege Escalation via pppd Username Injection (CVE-2026-75131) | HOL Guard CVE

High · CVSS 8.5CVE-2026-75131

NetworkManager-l2tp Privilege Escalation via pppd Username Injection

Answer in brief

CVE-2026-75131 records a High severity (CVSS 8.5) vulnerability in NetworkManager-l2tp Privilege Escalation via pppd Username Injection. The current sources do not mark it as known exploited. The current feed maps nm-l2tp/NetworkManager-l2tp (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 23, 2026Updated Sep 23, 2026Source checked Sep 23, 2026First seen by HOL Sep 23, 2026Material review Sep 23, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps nm-l2tp/NetworkManager-l2tp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
nm-l2tp/NetworkManager-l2tpgeneric	>=0 <=1.52.4	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for nm-l2tp/NetworkManager-l2tp.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 23, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.