A remote code execution in nmbd (the NetBIOS name services daemon) has been found in Samba versions 4.0.0 to 4.1.10. ( assgined CVE-2014-3560) and a patch has been release by the team at samba.org.

Here's the details from http://www.samba.org/samba/security/CVE-2014-3560

 
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Description
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All current versions of Samba 4.x.x are vulnerable to a remote code execution vulnerability in the nmbd NetBIOS name services daemon.

A malicious browser can send packets that may overwrite the heap ofthe target nmbd NetBIOS name services daemon. It may be possible to use this to generate a remote code execution vulnerability as the superuser (root).

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Patch Availability
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A patch addressing this defect has been posted to

  http://www.samba.org/samba/security/

Additionally, Samba 4.1.11 and 4.0.21 have been issued as security releases to correct the defect. Patches against older Samba versions are available at http://samba.org/samba/patches/. Samba vendors and administrators running affected versions are advised to upgrade or apply the patch as soon as possible.

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Workaround
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Do not run nmbd, the NetBIOS name services daemon.

Chris Mohan --- Internet Storm Center Handler on Duty