Race condition in (1) checkinstall 1.6.1 and (2) installwatch allows local users to overwrite arbitrary files and have other impacts via symlink and possibly other attacks on temporary working directories.
Exploitability
AV:LAC:MAu:NImpact
C:PI:PA:P4.4/AV:L/AC:M/Au:N/C:P/I:P/A:P