Hanafi
لا يصحIts place in«كنز الدقائق» p. 626
لا يصح رهن المشاع
رهن المشاع
هل يصح رهن المشاع؟
Each school’s answer
In our wordsHanafi
رهن المشاع لا يصح
لا يصحMaliki
Not stated in the sources
Shafi'i
رهن المشاع يصح
يصحHanbali
Not stated in the sources
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
يصحIts place in«منهاج الطالبين» p. 114
ويصح رهن المشاع
Hanbali
The sources give no view for it here.
What is «in our words» is our standard wording; the books’ texts stay as they are.