ktsuss versions 1.4 and prior spawns the GTK interface to run as root. This can allow a local attacker to escalate privileges to root and use the "GTK_MODULES" environment variable to possibly execute arbitrary code.
https://www.securityfocus.com/bid/49151
https://snyk.io/vuln/SNYK-LINUX-KTSUSS-174466
https://security-tracker.debian.org/tracker/CVE-2011-2922
https://packetstormsecurity.com/files/cve/CVE-2011-2922
https://packetstormsecurity.com/files/109154/Gentoo-Linux-Security-Advisory-201201-15.html