CVE-2026-75131

Name	CVE-2026-75131
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4808-1, DSA-6498-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
network-manager-l2tp (PTS)	bookworm	1.20.8-1	vulnerable
	bookworm (security)	1.20.8-1+deb12u1	fixed
	trixie	1.20.20-2	vulnerable
	trixie (security)	1.20.20-2+deb13u1	fixed
	forky, sid	1.52.6-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
network-manager-l2tp	source	bookworm	1.20.8-1+deb12u1	DLA-4808-1
network-manager-l2tp	source	trixie	1.20.20-2+deb13u1	DSA-6498-1
network-manager-l2tp	source	(unstable)	1.52.6-1

Notes

https://github.com/nm-l2tp/NetworkManager-l2tp/security/advisories/GHSA-v2wj-xr2m-xc4j
Fixed by: https://github.com/nm-l2tp/NetworkManager-l2tp/commit/64879ce0ad866f7c9a45babe4d95731a916ea00f (1.52.6, 1.20.26)