A vulnerability in uutils coreutils mkfifo allows for the unauthorized modification of permissions on existing files. When mkfifo fails to create a FIFO because…

A vulnerability in uutils coreutils mkfifo command allows unauthorized modification of file permissions on existing files. When mkfifo fails to create a FIFO due to an existing file at the target path, it incorrectly continues execution and calls set_permissions, changing the existing file's permissions to default mode (typically 644). This can expose sensitive files like SSH private keys to unauthorized users on the system by making them readable by others when they should have restricted permissions.