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CVE-2016-2856 is a vulnerability in the pt_chown utility included with certain versions of the glibc and elibc packages on Debian and Ubuntu systems. The vulnerability arises from a lack of namespace checks when handling file-descriptor passing, allowing local users to exploit pts read and write operations. This can be used to capture keystrokes, spoof data, and potentially escalate privileges. The issue is specific to distributions that enable pt_chown, as upstream glibc documentation recommends against its use for security reasons.
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