diff -up vim82/src/regexp.c.cve4192 vim82/src/regexp.c
--- vim82/src/regexp.c.cve4192	2021-03-22 10:02:42.000000000 +0100
+++ vim82/src/regexp.c	2022-01-13 10:54:17.629176807 +0100
@@ -1316,9 +1316,9 @@ reg_match_visual(void)
     if (lnum < top.lnum || lnum > bot.lnum)
 	return FALSE;
 
+    col = (colnr_T)(rex.input - rex.line);
     if (mode == 'v')
     {
-	col = (colnr_T)(rex.input - rex.line);
 	if ((lnum == top.lnum && col < top.col)
 		|| (lnum == bot.lnum && col >= bot.col + (*p_sel != 'e')))
 	    return FALSE;
@@ -1333,7 +1333,12 @@ reg_match_visual(void)
 	    end = end2;
 	if (top.col == MAXCOL || bot.col == MAXCOL)
 	    end = MAXCOL;
-	cols = win_linetabsize(wp, rex.line, (colnr_T)(rex.input - rex.line));
+
+	// getvvcol() flushes rex.line, need to get it again
+	rex.line = reg_getline(rex.lnum);
+	rex.input = rex.line + col;
+
+	cols = win_linetabsize(wp, rex.line, col);
 	if (cols < start || cols > end - (*p_sel == 'e'))
 	    return FALSE;
     }
diff -up vim82/src/testdir/test_regexp_latin.vim.cve4192 vim82/src/testdir/test_regexp_latin.vim
--- vim82/src/testdir/test_regexp_latin.vim.cve4192	2022-01-13 10:52:05.508789448 +0100
+++ vim82/src/testdir/test_regexp_latin.vim	2022-01-13 10:52:05.510789454 +0100
@@ -946,4 +946,12 @@ func Test_using_invalid_visual_position(
   bwipe!
 endfunc
 
+func Test_using_visual_position()
+  " this was using freed memory
+  new
+  exe "norm 0o\<Esc>\<C-V>k\<C-X>o0"
+  /\%V
+  bwipe!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab