{"id":"CVE-2016-5696","details":"net/ipv4/tcp_input.c in the Linux kernel before 4.7 does not properly determine the rate of challenge ACK segments, which makes it easier for remote attackers to hijack TCP sessions via a blind in-window attack.","modified":"2026-02-24T11:17:02.525003Z","published":"2016-08-06T20:59:05.690Z","related":["MGASA-2016-0271","MGASA-2016-0283","SUSE-SU-2016:2245-1","SUSE-SU-2016:2912-1","SUSE-SU-2016:2976-1","SUSE-SU-2016:3069-1","SUSE-SU-2016:3304-1","SUSE-SU-2017:0437-1","SUSE-SU-2017:0471-1","SUSE-SU-2017:1102-1"],"references":[{"type":"WEB","url":"http://www.securityfocus.com/bid/91704"},{"type":"WEB","url":"http://www.securitytracker.com/id/1036625"},{"type":"WEB","url":"https://kc.mcafee.com/corporate/index?page=content&id=SB10167"},{"type":"WEB","url":"https://security.paloaltonetworks.com/CVE-2016-5696"},{"type":"ADVISORY","url":"http://rhn.redhat.com/errata/RHSA-2016-1631.html"},{"type":"ADVISORY","url":"http://rhn.redhat.com/errata/RHSA-2016-1632.html"},{"type":"ADVISORY","url":"http://rhn.redhat.com/errata/RHSA-2016-1633.html"},{"type":"ADVISORY","url":"http://rhn.redhat.com/errata/RHSA-2016-1657.html"},{"type":"ADVISORY","url":"http://rhn.redhat.com/errata/RHSA-2016-1664.html"},{"type":"ADVISORY","url":"http://rhn.redhat.com/errata/RHSA-2016-1814.html"},{"type":"ADVISORY","url":"http://rhn.redhat.com/errata/RHSA-2016-1815.html"},{"type":"ADVISORY","url":"http://rhn.redhat.com/errata/RHSA-2016-1939.html"},{"type":"ADVISORY","url":"http://source.android.com/security/bulletin/2016-10-01.html"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2016/07/12/2"},{"type":"ADVISORY","url":"http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html"},{"type":"ADVISORY","url":"http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html"},{"type":"ADVISORY","url":"http://www.ubuntu.com/usn/USN-3070-1"},{"type":"ADVISORY","url":"http://www.ubuntu.com/usn/USN-3070-2"},{"type":"ADVISORY","url":"http://www.ubuntu.com/usn/USN-3070-3"},{"type":"ADVISORY","url":"http://www.ubuntu.com/usn/USN-3070-4"},{"type":"ADVISORY","url":"http://www.ubuntu.com/usn/USN-3071-1"},{"type":"ADVISORY","url":"http://www.ubuntu.com/usn/USN-3071-2"},{"type":"ADVISORY","url":"http://www.ubuntu.com/usn/USN-3072-1"},{"type":"ADVISORY","url":"http://www.ubuntu.com/usn/USN-3072-2"},{"type":"ADVISORY","url":"https://bto.bluecoat.com/security-advisory/sa131"},{"type":"ADVISORY","url":"https://github.com/Gnoxter/mountain_goat"},{"type":"ADVISORY","url":"https://www.arista.com/en/support/advisories-notices/security-advisories/1461-security-advisory-23"},{"type":"REPORT","url":"http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1354708"},{"type":"REPORT","url":"https://github.com/torvalds/linux/commit/75ff39ccc1bd5d3c455b6822ab09e533c551f758"},{"type":"FIX","url":"http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758"},{"type":"FIX","url":"https://github.com/torvalds/linux/commit/75ff39ccc1bd5d3c455b6822ab09e533c551f758"},{"type":"ARTICLE","url":"http://www.openwall.com/lists/oss-security/2016/07/12/2"},{"type":"ARTICLE","url":"http://www.prnewswire.com/news-releases/mitnick-attack-reappears-at-geekpwn-macau-contest-300270779.html"},{"type":"ARTICLE","url":"https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_cao.pdf"},{"type":"EVIDENCE","url":"https://github.com/Gnoxter/mountain_goat"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git","events":[{"introduced":"0"},{"fixed":"75ff39ccc1bd5d3c455b6822ab09e533c551f758"}]}],"versions":["v2.6.12","v2.6.12-rc2","v2.6.12-rc3","v2.6.12-rc4","v2.6.12-rc5","v2.6.12-rc6","v2.6.13","v2.6.13-rc1","v2.6.13-rc2","v2.6.13-rc3","v2.6.13-rc4","v2.6.13-rc5","v2.6.13-rc6","v2.6.13-rc7","v2.6.14","v2.6.14-rc1","v2.6.14-rc2","v2.6.14-rc3","v2.6.14-rc4","v2.6.14-rc5","v2.6.15","v2.6.15-rc1","v2.6.15-rc2","v2.6.15-rc3","v2.6.15-rc4","v2.6.15-rc5","v2.6.15-rc6","v2.6.15-rc7","v2.6.16","v2.6.16-rc1","v2.6.16-rc2","v2.6.16-rc3","v2.6.16-rc4","v2.6.16-rc5","v2.6.16-rc6","v2.6.17","v2.6.17-rc1","v2.6.17-rc2","v2.6.17-rc3","v2.6.17-rc4","v2.6.17-rc5","v2.6.17-rc6","v2.6.18","v2.6.18-rc1","v2.6.18-rc2","v2.6.18-rc3","v2.6.18-rc4","v2.6.18-rc5","v2.6.18-rc6","v2.6.18-rc7","v2.6.19","v2.6.19-rc1","v2.6.19-rc2","v2.6.19-rc3","v2.6.19-rc4","v2.6.19-rc5","v2.6.19-rc6","v2.6.20","v2.6.20-rc1","v2.6.20-rc2","v2.6.20-rc3","v2.6.20-rc4","v2.6.20-rc5","v2.6.20-rc6","v2.6.20-rc7","v2.6.21","v2.6.21-rc1","v2.6.21-rc2","v2.6.21-rc3","v2.6.21-rc4","v2.6.21-rc5","v2.6.21-rc6","v2.6.21-rc7","v2.6.22","v2.6.22-rc1","v2.6.22-rc2","v2.6.22-rc3","v2.6.22-rc4","v2.6.22-rc5","v2.6.22-rc6","v2.6.22-rc7","v2.6.23","v2.6.23-rc1","v2.6.23-rc2","v2.6.23-rc3","v2.6.23-rc4","v2.6.23-rc5","v2.6.23-rc6","v2.6.23-rc7","v2.6.23-rc8","v2.6.23-rc9","v2.6.24","v2.6.24-rc1","v2.6.24-rc2","v2.6.24-rc3","v2.6.24-rc4","v2.6.24-rc5","v2.6.24-rc6","v2.6.24-rc7","v2.6.24-rc8","v2.6.25","v2.6.25-rc1","v2.6.25-rc2","v2.6.25-rc3","v2.6.25-rc4","v2.6.25-rc5","v2.6.25-rc6","v2.6.25-rc7","v2.6.25-rc8","v2.6.25-rc9","v2.6.26","v2.6.26-rc1","v2.6.26-rc2","v2.6.26-rc3","v2.6.26-rc4","v2.6.26-rc5","v2.6.26-rc6","v2.6.26-rc7","v2.6.26-rc8","v2.6.26-rc9","v2.6.27","v2.6.27-rc1","v2.6.27-rc2","v2.6.27-rc3","v2.6.27-rc4","v2.6.27-rc5","v2.6.27-rc6","v2.6.27-rc7","v2.6.27-rc8","v2.6.27-rc9","v2.6.28","v2.6.28-rc1","v2.6.28-rc2","v2.6.28-rc3","v2.6.28-rc4","v2.6.28-rc5","v2.6.28-rc6","v2.6.28-rc7","v2.6.28-rc8","v2.6.28-rc9","v2.6.29","v2.6.29-rc1","v2.6.29-rc2","v2.6.29-rc3","v2.6.29-rc4","v2.6.29-rc5","v2.6.29-rc6","v2.6.29-rc7","v2.6.29-rc8","v2.6.30","v2.6.30-rc1","v2.6.30-rc2","v2.6.30-rc3","v2.6.30-rc4","v2.6.30-rc5","v2.6.30-rc6","v2.6.30-rc7","v2.6.30-rc8","v2.6.31","v2.6.31-rc1","v2.6.31-rc2","v2.6.31-rc3","v2.6.31-rc4","v2.6.31-rc5","v2.6.31-rc6","v2.6.31-rc7","v2.6.31-rc8","v2.6.31-rc9","v2.6.32","v2.6.32-rc1","v2.6.32-rc2","v2.6.32-rc3","v2.6.32-rc4","v2.6.32-rc5","v2.6.32-rc6","v2.6.32-rc7","v2.6.32-rc8","v2.6.33","v2.6.33-rc1","v2.6.33-rc2","v2.6.33-rc3","v2.6.33-rc4","v2.6.33-rc5","v2.6.33-rc6","v2.6.33-rc7","v2.6.33-rc8","v2.6.34","v2.6.34-rc1","v2.6.34-rc2","v2.6.34-rc3","v2.6.34-rc4","v2.6.34-rc5","v2.6.34-rc6","v2.6.34-rc7","v2.6.35","v2.6.35-rc1","v2.6.35-rc2","v2.6.35-rc3","v2.6.35-rc4","v2.6.35-rc5","v2.6.35-rc6","v2.6.36","v2.6.36-rc1","v2.6.36-rc2","v2.6.36-rc3","v2.6.36-rc4","v2.6.36-rc5","v2.6.36-rc6","v2.6.36-rc7","v2.6.36-rc8","v2.6.37","v2.6.37-rc1","v2.6.37-rc2","v2.6.37-rc3","v2.6.37-rc4","v2.6.37-rc5","v2.6.37-rc6","v2.6.37-rc7","v2.6.37-rc8","v2.6.38","v2.6.38-rc1","v2.6.38-rc2","v2.6.38-rc3","v2.6.38-rc4","v2.6.38-rc5","v2.6.38-rc6","v2.6.38-rc7","v2.6.38-rc8","v2.6.39","v2.6.39-rc1","v2.6.39-rc2","v2.6.39-rc3","v2.6.39-rc4","v2.6.39-rc5","v2.6.39-rc6","v2.6.39-rc7","v3.0","v3.0-rc1","v3.0-rc2","v3.0-rc3","v3.0-rc4","v3.0-rc5","v3.0-rc6","v3.0-rc7","v3.1","v3.1-rc1","v3.1-rc10","v3.1-rc2","v3.1-rc3","v3.1-rc4","v3.1-rc5","v3.1-rc6","v3.1-rc7","v3.1-rc8","v3.1-rc9","v3.10","v3.10-rc1","v3.10-rc2","v3.10-rc3","v3.10-rc4","v3.10-rc5","v3.10-rc6","v3.10-rc7","v3.11","v3.11-rc1","v3.11-rc2","v3.11-rc3","v3.11-rc4","v3.11-rc5","v3.11-rc6","v3.11-rc7","v3.12","v3.12-rc1","v3.12-rc2","v3.12-rc3","v3.12-rc4","v3.12-rc5","v3.12-rc6","v3.12-rc7","v3.13","v3.13-rc1","v3.13-rc2","v3.13-rc3","v3.13-rc4","v3.13-rc5","v3.13-rc6","v3.13-rc7","v3.13-rc8","v3.14","v3.14-rc1","v3.14-rc2","v3.14-rc3","v3.14-rc4","v3.14-rc5","v3.14-rc6","v3.14-rc7","v3.14-rc8","v3.15","v3.15-rc1","v3.15-rc2","v3.15-rc3","v3.15-rc4","v3.15-rc5","v3.15-rc6","v3.15-rc7","v3.15-rc8","v3.16","v3.16-rc1","v3.16-rc2","v3.16-rc3","v3.16-rc4","v3.16-rc5","v3.16-rc6","v3.16-rc7","v3.17","v3.17-rc1","v3.17-rc2","v3.17-rc3","v3.17-rc4","v3.17-rc5","v3.17-rc6","v3.17-rc7","v3.18","v3.18-rc1","v3.18-rc2","v3.18-rc3","v3.18-rc4","v3.18-rc5","v3.18-rc6","v3.18-rc7","v3.19","v3.19-rc1","v3.19-rc2","v3.19-rc3","v3.19-rc4","v3.19-rc5","v3.19-rc6","v3.19-rc7","v3.2","v3.2-rc1","v3.2-rc2","v3.2-rc3","v3.2-rc4","v3.2-rc5","v3.2-rc6","v3.2-rc7","v3.3","v3.3-rc1","v3.3-rc2","v3.3-rc3","v3.3-rc4","v3.3-rc5","v3.3-rc6","v3.3-rc7","v3.4","v3.4-rc1","v3.4-rc2","v3.4-rc3","v3.4-rc4","v3.4-rc5","v3.4-rc6","v3.4-rc7","v3.5","v3.5-rc1","v3.5-rc2","v3.5-rc3","v3.5-rc4","v3.5-rc5","v3.5-rc6","v3.5-rc7","v3.6","v3.6-rc1","v3.6-rc2","v3.6-rc3","v3.6-rc4","v3.6-rc5","v3.6-rc6","v3.6-rc7","v3.7","v3.7-rc1","v3.7-rc2","v3.7-rc3","v3.7-rc4","v3.7-rc5","v3.7-rc6","v3.7-rc7","v3.7-rc8","v3.8","v3.8-rc1","v3.8-rc2","v3.8-rc3","v3.8-rc4","v3.8-rc5","v3.8-rc6","v3.8-rc7","v3.9","v3.9-rc1","v3.9-rc2","v3.9-rc3","v3.9-rc4","v3.9-rc5","v3.9-rc6","v3.9-rc7","v3.9-rc8","v4.0","v4.0-rc1","v4.0-rc2","v4.0-rc3","v4.0-rc4","v4.0-rc5","v4.0-rc6","v4.0-rc7","v4.1","v4.1-rc1","v4.1-rc2","v4.1-rc3","v4.1-rc4","v4.1-rc5","v4.1-rc6","v4.1-rc7","v4.1-rc8","v4.2","v4.2-rc1","v4.2-rc2","v4.2-rc3","v4.2-rc4","v4.2-rc5","v4.2-rc6","v4.2-rc7","v4.2-rc8","v4.3","v4.3-rc1","v4.3-rc2","v4.3-rc3","v4.3-rc4","v4.3-rc5","v4.3-rc6","v4.3-rc7","v4.4","v4.4-rc1","v4.4-rc2","v4.4-rc3","v4.4-rc4","v4.4-rc5","v4.4-rc6","v4.4-rc7","v4.4-rc8","v4.5","v4.5-rc1","v4.5-rc2","v4.5-rc3","v4.5-rc4","v4.5-rc5","v4.5-rc6","v4.5-rc7","v4.6","v4.6-rc1","v4.6-rc2","v4.6-rc3","v4.6-rc4","v4.6-rc5","v4.6-rc6","v4.6-rc7","v4.7-rc1","v4.7-rc2","v4.7-rc3","v4.7-rc4","v4.7-rc5","v4.7-rc6"],"database_specific":{"vanir_signatures":[{"target":{"function":"tcp_send_challenge_ack","file":"net/ipv4/tcp_input.c"},"id":"CVE-2016-5696-3079b827","deprecated":false,"digest":{"length":479,"function_hash":"317424369091742007402530138941656856519"},"signature_version":"v1","signature_type":"Function","source":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git@75ff39ccc1bd5d3c455b6822ab09e533c551f758"},{"target":{"file":"net/ipv4/tcp_input.c"},"id":"CVE-2016-5696-9c1cb08f","deprecated":false,"digest":{"threshold":0.9,"line_hashes":["337350145804779339330594945509006368024","239125848350168077293675951068588329693","155800975917078570903974579556486526694","214077486385140182600903825827271961016","299725323958299412875357565839455187375","105979103483326321441603223828175463793","261565725033869532375054669583338089927","105613207827221158594970792067072456143","129575374934853602782248044972495836418","332543767270114264396376132802890145974","164052961824676823733982451124962484362","115015315111503299398347337553858582016","237419743845812927883483344238137098208","109227497217799153108656921983898490592","34943939768429199658478459830712634089","68065258545218086070659223335560626219","208526435651038356539307190846209248681"]},"signature_version":"v1","signature_type":"Line","source":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git@75ff39ccc1bd5d3c455b6822ab09e533c551f758"}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2016-5696.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L"}]}