For quick thinking it was a Trent Alexander-Arnold moment, and it gave Madrid a lead they deserved and never looked like giving up.
All the matches this week are at King Abdullah Sports City stadium, outside Jeddah.
Defender Raphael Varane scored one goal and helped to force a goalkeeping error for another to secure Real Madrid a 3-0 win at Getafe on Saturday in its first match since the Spanish league's winter break.
Madrid fired a blank at this ground last term but edged in front after 34 minutes on this latest visit, Soria getting the final touch after Varane beat him to Ferland Mendy's cross.
But the Valencia keeper was soon caught out by Kroos' inswinging corner.
"This is my fifth Supercopa and in the first three I had to play the second leg away from home, against the league champions", he added.
Whereas, Real Madrid is amidst a transition, yet they have been able to challenge the might of Barcelona and are doing well with the current resources. Instead there was a midfield five interchanging positions and they had Valencia on a carousel of passes in the first half.
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He placed the ball down, and whipped the ball toward the Valencia penalty area.
Luka Modric scored Real Madrid's third in stoppage time after running up the pitch with Fede Valverde. He slotted the rebound into the corner past Domench.
Bale has scored 104 times in 245 appearances in his almost seven years with the Spanish champions.
But Madrid dominated the start of the second half with Isco enjoying his role in that well populated midfield.
One clinical passing move set up Modric for a shot and, when his effort was blocked by Ezequiel Garay, Isco controlled the ball on his chest and volleyed expertly home from 12 yards.
Karim Benzema has been playing for Real Madrid for the past 10 years and has featured in close to 500 games scoring 238 goals for Los Blancos. Real Madrid themselves have a load of injuries in their team as well.
In came, Sergio Ramos from suspension, Luka Jovic who replaced Gareth Bale and Federico Valverde. This felt a bit like an exhibition game and Modric and Kroos' goals were reminders of what great players they still are.