scripts/annotate-output.sh in devscripts before 2.12.2, as used in rpmdevtools before 8.3, allows local users to modify arbitrary files via a symlink attack on the temporary (1) standard output or (2) standard error output file.
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.