CVE-2026-93337

Name	CVE-2026-93337
Description	NetworkManager-l2tp through 1.52.4, fixed in 1.52.6, contains an improper input validation vulnerability that allows local users with VPN connection creation permissions to inject arbitrary pppd directives by supplying mru or mtu property values containing trailing non-numeric content after a valid integer. Attackers can exploit the verbatim write of unvalidated strings into the pppd options file via write_config_option() to inject the plugin directive, causing the privileged pppd process to load an attacker-controlled shared object and achieve arbitrary code execution as root.
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-rp84-8h2r-5xc3
Fixed by: https://github.com/nm-l2tp/NetworkManager-l2tp/commit/64879ce0ad866f7c9a45babe4d95731a916ea00f (1.52.6, 1.20.26)