SplitVT is a program for splitting terminals into two shells.
Mike Ashton reported that SplitVT does not drop group privileges before executing the xprop utility.
A local attacker could exploit this vulnerability to gain the "utmp" group privileges.
There is no known workaround at this time.
All SplitVT users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-misc/splitvt-1.6.6-r1"