The Server Message Block (SMB) driver (MRXSMB.SYS) in Microsoft Windows 2000 SP4, XP SP1 and SP2, and Server 2003 SP1 and earlier allows local users to cause a denial of service (hang) by calling the MrxSmbCscIoctlCloseForCopyChunk with the file handle of the shadow device, which results in a deadlock, aka the "SMB Invalid Handle Vulnerability."
https://exchange.xforce.ibmcloud.com/vulnerabilities/26830
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-030
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=409