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CVE-2016-5696

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.

Published:Jul 12, 2016

Last Modified:Apr 12, 2025

EPS:Aug 6, 2016

EPSS Score:0.34409

CVSS Score:4.8

Affected Products

Vendor

Product

Action

Vendor

Google

Product

Android

Google

Android

Vendor

Linux

Product

Linux Kernel

Linux

Linux Kernel

Vendor

Oracle

Product

Vm Server

Oracle

Vm Server

Vendor

Redhat

Product

Enterprise Linux

Redhat

Enterprise Linux

Vendor

Redhat

Product

Enterprise Mrg

Redhat

Enterprise Mrg

Vendor

Redhat

Product

Rhel Aus

Redhat

Rhel Aus

Vendor

Redhat

Product

Rhel Eus

Redhat

Rhel Eus

Vendor

Redhat

Product

Rhel Extras Rt

Redhat

Rhel Extras Rt

Exploits

https://github.com/Gnoxter/mountain_goat https://github.com/Gnoxter/mountain_goat https://github.com/bplinux/chackd https://github.com/Gnoxter/mountain_goat https://github.com/jduck/challack https://github.com/unkaktus/grill https://github.com/violentshell/rover

Common Weakness Enumeration

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

CWE-203 Observable Discrepancy

Common Attack Pattern Enumeration and Classification (CAPEC)

CAPEC-116 Excavation

CAPEC-13 Subverting Environment Variable Values

CAPEC-169 Footprinting

CAPEC-189 Black Box Reverse Engineering

CAPEC-22 Exploiting Trust in Client

CAPEC-224 Fingerprinting

CAPEC-285 ICMP Echo Request Ping

CAPEC-287 TCP SYN Scan

CAPEC-290 Enumerate Mail Exchange (MX) Records

CAPEC-291 DNS Zone Transfers

CAPEC-292 Host Discovery

CAPEC-293 Traceroute Route Enumeration

CAPEC-294 ICMP Address Mask Request

CAPEC-295 Timestamp Request

CAPEC-296 ICMP Information Request

CAPEC-297 TCP ACK Ping

CAPEC-298 UDP Ping

CAPEC-299 TCP SYN Ping

CAPEC-300 Port Scanning

CAPEC-301 TCP Connect Scan

CAPEC-302 TCP FIN Scan

CAPEC-303 TCP Xmas Scan

CAPEC-304 TCP Null Scan

CAPEC-305 TCP ACK Scan

CAPEC-306 TCP Window Scan

CAPEC-307 TCP RPC Scan

CAPEC-308 UDP Scan

CAPEC-309 Network Topology Mapping

CAPEC-310 Scanning for Vulnerable Software

CAPEC-312 Active OS Fingerprinting

CAPEC-313 Passive OS Fingerprinting

CAPEC-317 IP ID Sequencing Probe

CAPEC-318 IP 'ID' Echoed Byte-Order Probe

CAPEC-319 IP (DF) 'Don't Fragment Bit' Echoing Probe

CAPEC-320 TCP Timestamp Probe

CAPEC-321 TCP Sequence Number Probe

CAPEC-322 TCP (ISN) Greatest Common Divisor Probe

CAPEC-323 TCP (ISN) Counter Rate Probe

CAPEC-324 TCP (ISN) Sequence Predictability Probe

CAPEC-325 TCP Congestion Control Flag (ECN) Probe

CAPEC-326 TCP Initial Window Size Probe

CAPEC-327 TCP Options Probe

CAPEC-328 TCP 'RST' Flag Checksum Probe

CAPEC-329 ICMP Error Message Quoting Probe

CAPEC-330 ICMP Error Message Echoing Integrity Probe

CAPEC-472 Browser Fingerprinting

CAPEC-497 File Discovery

CAPEC-508 Shoulder Surfing

CAPEC-573 Process Footprinting

CAPEC-574 Services Footprinting

CAPEC-575 Account Footprinting

CAPEC-576 Group Permission Footprinting

CAPEC-577 Owner Footprinting

CAPEC-59 Session Credential Falsification through Prediction

CAPEC-60 Reusing Session IDs (aka Session Replay)

CAPEC-616 Establish Rogue Location

CAPEC-643 Identify Shared Files/Directories on System

CAPEC-646 Peripheral Footprinting

CAPEC-651 Eavesdropping

CAPEC-79 Using Slashes in Alternate Encoding

Related CVEs

CVE-2026-87583 (CVSS 5.4) — UI misrepresentation in Passwords in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attac…

CVE-2026-87624 (CVSS 4.2) — UI misrepresentation in Passwords in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attac…

CVE-2026-87597 (CVSS 4.8) — UI misrepresentation in CustomTabs in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote atta…

CVE-2026-87565 (CVSS 6.5) — Information leak in Passwords in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attacker …

CVE-2026-87463 (CVSS 4.8) — Incorrect authorization in Certificate in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote …

CVE-2026-87483 (CVSS 6.5) — Incorrect authorization in Browser in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote atta…

CVE-2026-87555 (CVSS 4.7) — Uninitialized resource in GPU in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attacker …

CVE-2026-87486 (CVSS 4) — Clickjacking in TrustedWebActivities in Google Chrome on on Android prior to 153.0.8010.36 allowed a local att…

CVE-2026-87643 (CVSS 9.6) — Integer overflow in GPU in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attacker to pot…

CVE-2026-87534 (CVSS 9.8) — Missing authorization in WebView in Google Chrome on on Android prior to 153.0.8010.36 allowed a remote attack…

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758

http://rhn.redhat.com/errata/RHSA-2016-1631.html

http://rhn.redhat.com/errata/RHSA-2016-1632.html

http://rhn.redhat.com/errata/RHSA-2016-1633.html

http://rhn.redhat.com/errata/RHSA-2016-1657.html

http://rhn.redhat.com/errata/RHSA-2016-1664.html

http://rhn.redhat.com/errata/RHSA-2016-1814.html

http://rhn.redhat.com/errata/RHSA-2016-1815.html

http://rhn.redhat.com/errata/RHSA-2016-1939.html

http://source.android.com/security/bulletin/2016-10-01.html

http://www.openwall.com/lists/oss-security/2016/07/12/2

http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html

http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html

http://www.prnewswire.com/news-releases/mitnick-attack-reappears-at-geekpwn-macau-contest-300270779.html

http://www.securityfocus.com/bid/91704

http://www.securitytracker.com/id/1036625

http://www.ubuntu.com/usn/USN-3070-1

http://www.ubuntu.com/usn/USN-3070-2

http://www.ubuntu.com/usn/USN-3070-3

http://www.ubuntu.com/usn/USN-3070-4

http://www.ubuntu.com/usn/USN-3071-1

http://www.ubuntu.com/usn/USN-3071-2

http://www.ubuntu.com/usn/USN-3072-1

http://www.ubuntu.com/usn/USN-3072-2

https://bto.bluecoat.com/security-advisory/sa131

https://bugzilla.redhat.com/show_bug.cgi?id=1354708

https://github.com/Gnoxter/mountain_goat

https://github.com/torvalds/linux/commit/75ff39ccc1bd5d3c455b6822ab09e533c551f758

https://kc.mcafee.com/corporate/index?page=content&id=SB10167

https://security.paloaltonetworks.com/CVE-2016-5696

https://www.arista.com/en/support/advisories-notices/security-advisories/1461-security-advisory-23

https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_cao.pdf

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758

http://rhn.redhat.com/errata/RHSA-2016-1631.html

http://rhn.redhat.com/errata/RHSA-2016-1632.html

http://rhn.redhat.com/errata/RHSA-2016-1633.html

http://rhn.redhat.com/errata/RHSA-2016-1657.html

http://rhn.redhat.com/errata/RHSA-2016-1664.html

http://rhn.redhat.com/errata/RHSA-2016-1814.html

http://rhn.redhat.com/errata/RHSA-2016-1815.html

http://rhn.redhat.com/errata/RHSA-2016-1939.html

http://source.android.com/security/bulletin/2016-10-01.html

http://www.openwall.com/lists/oss-security/2016/07/12/2

http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html

http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html

http://www.prnewswire.com/news-releases/mitnick-attack-reappears-at-geekpwn-macau-contest-300270779.html

http://www.securityfocus.com/bid/91704

http://www.securitytracker.com/id/1036625

http://www.ubuntu.com/usn/USN-3070-1

http://www.ubuntu.com/usn/USN-3070-2

http://www.ubuntu.com/usn/USN-3070-3

http://www.ubuntu.com/usn/USN-3070-4

http://www.ubuntu.com/usn/USN-3071-1

http://www.ubuntu.com/usn/USN-3071-2

http://www.ubuntu.com/usn/USN-3072-1

http://www.ubuntu.com/usn/USN-3072-2

https://bto.bluecoat.com/security-advisory/sa131

https://bugzilla.redhat.com/show_bug.cgi?id=1354708

https://github.com/Gnoxter/mountain_goat

https://github.com/torvalds/linux/commit/75ff39ccc1bd5d3c455b6822ab09e533c551f758

https://kc.mcafee.com/corporate/index?page=content&id=SB10167

https://security.paloaltonetworks.com/CVE-2016-5696

https://www.arista.com/en/support/advisories-notices/security-advisories/1461-security-advisory-23

https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_cao.pdf

Common Vulnerability Scoring System

Attack Vector

Network

Adjacent

Local

Physical

Privileges Required

None

Low

High

User Interaction

None

Required

Scope

Unchanged

Changed

Confidentiality

None

Low

High

Integrity

None

Low

High

Availability

None

Low

High