{"id":"CVE-2016-2856","details":"pt_chown in the glibc package before 2.19-18+deb8u4 on Debian jessie; the elibc package before 2.15-0ubuntu10.14 on Ubuntu 12.04 LTS and before 2.19-0ubuntu6.8 on Ubuntu 14.04 LTS; and the glibc package before 2.21-0ubuntu4.2 on Ubuntu 15.10 and before 2.23-0ubuntu1 on Ubuntu 16.04 LTS and 16.10 lacks a namespace check associated with file-descriptor passing, which allows local users to capture keystrokes and spoof data, and possibly gain privileges, via pts read and write operations, related to debian/sysdeps/linux.mk.  NOTE: this is not considered a vulnerability in the upstream GNU C Library because the upstream documentation has a clear security recommendation against the --enable-pt_chown option.","modified":"2026-03-12T22:17:31.562971Z","published":"2016-03-14T01:59:04.950Z","references":[{"type":"WEB","url":"http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=09f7764882a81e13e7b5d87d715412283a6ce403"},{"type":"WEB","url":"http://www.securityfocus.com/bid/84601"},{"type":"WEB","url":"http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=11475c083282c1582c4dd72eecfcb2b7d308c958"},{"type":"WEB","url":"http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2856.html"},{"type":"WEB","url":"http://www.halfdog.net/Security/2015/PtChownArbitraryPtsAccessViaUserNamespace/"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2016/02/23/3"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2016/03/07/2"},{"type":"ADVISORY","url":"http://www.ubuntu.com/usn/USN-2985-2"},{"type":"ADVISORY","url":"http://www.ubuntu.com/usn/USN-2985-1"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"12.04"}]},{"events":[{"introduced":"0"},{"last_affected":"14.04"}]},{"events":[{"introduced":"0"},{"last_affected":"15.10"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"fixed":"2.19-18+deb8u4"}]},{"events":[{"introduced":"0"},{"fixed":"2.15-0ubuntu10.14"}]},{"events":[{"introduced":"0"},{"fixed":"2.19-0ubuntu6.8"}]},{"events":[{"introduced":"0"},{"fixed":"2.21-0ubuntu4.2"}]},{"events":[{"introduced":"0"},{"fixed":"2.23-0ubuntu1"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2016-2856.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}