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Linux Kernel CVE-2016-5696

MEDIUM
Information Exposure (CWE-200)
2016-08-06 cve@mitre.org
4.8
CVSS 3.0 · NVD
View

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V14 - Data Protection Data exposure prevention
MITRE ATT&CK

2 techniques across 2 tactics: Collection, Discovery

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

CVSS score of 4.8 (MEDIUM). Attack characteristics: network attack vector, high complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 51.99%.

Exploit ScenarioDerived

A remote attacker could access sensitive data that should not be disclosed by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 52.0% exploitation probability (EPSS)

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AnalysisAI

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. Rated medium severity (CVSS 4.8), this vulnerability is remotely exploitable, no authentication required. Public exploit code available and EPSS exploitation probability 52.0%.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Minimize information in error messages, implement proper access controls, encrypt sensitive data at rest and in transit.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Exposure of Sensitive Information (CWE-200), which allows attackers to access sensitive data that should not be disclosed. 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. Affected products include: Google Android, Oracle Vm Server, Linux Linux Kernel. Version information: before 4.7.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 4.8 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

DescriptionCVE.org

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.

Threat Intelligence Overview

Threat Score
4.0/10
Composite threat intelligence
EPSS Score
52.0%
Top 2% exploitable
Exploit
POC
Public exploit code exists
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC Yes
EPSS 52.0%
Patch available Yes
Active threat Yes
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

96
Low Medium High Critical
KEV: 0
EPSS: +52
CVSS: +24
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:o:google:android:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:vm_server:3.3:*:*:*:*:*:*:*
cpe:2.3:a:oracle:vm_server:3.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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References

Advisories & patches
PATCH http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758 PATCH https://github.com/torvalds/linux/commit/75ff39ccc1bd5d3c455b6822ab09e533c551f758 ADVISORY http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html REF http://rhn.redhat.com/errata/RHSA-2016-1631.html REF http://rhn.redhat.com/errata/RHSA-2016-1632.html REF http://rhn.redhat.com/errata/RHSA-2016-1633.html REF http://rhn.redhat.com/errata/RHSA-2016-1657.html REF http://rhn.redhat.com/errata/RHSA-2016-1664.html REF http://rhn.redhat.com/errata/RHSA-2016-1814.html REF http://rhn.redhat.com/errata/RHSA-2016-1815.html REF http://rhn.redhat.com/errata/RHSA-2016-1939.html REF http://source.android.com/security/bulletin/2016-10-01.html REF http://www.openwall.com/lists/oss-security/2016/07/12/2 REF http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html REF http://www.prnewswire.com/news-releases/mitnick-attack-reappears-at-geekpwn-macau-contest-300270779.html REF http://www.securityfocus.com/bid/91704 REF http://www.securitytracker.com/id/1036625 REF http://www.ubuntu.com/usn/USN-3070-1 REF http://www.ubuntu.com/usn/USN-3070-2 REF http://www.ubuntu.com/usn/USN-3070-3 REF http://www.ubuntu.com/usn/USN-3070-4 REF http://www.ubuntu.com/usn/USN-3071-1 REF http://www.ubuntu.com/usn/USN-3071-2 REF http://www.ubuntu.com/usn/USN-3072-1 REF http://www.ubuntu.com/usn/USN-3072-2 REF https://bto.bluecoat.com/security-advisory/sa131 REF https://bugzilla.redhat.com/show_bug.cgi?id=1354708 REF https://kc.mcafee.com/corporate/index?page=content&id=SB10167 REF https://security.paloaltonetworks.com/CVE-2016-5696 REF https://www.arista.com/en/support/advisories-notices/security-advisories/1461-security-advisory-23 REF https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_cao.pdf

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