CVE-2016-5696 json
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 f…
published 2016-08-06 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-6639
- cvss
- 4.8
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 14.5%
- EPSS 14.5% chance of exploitation in 30 days, percentile 96%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- linux Debian 14, Debian 13, Debian 12 4.7.2-1
debian advisories DEBIAN-CVE-2016-5696
- linux Ubuntu 14.04 LTS 3.13.0-95.142
- linux Ubuntu 16.04 LTS 4.4.0-36.55
- linux-raspi2 Ubuntu 16.04 LTS 4.4.0-1021.27
- linux-lts-vivid Ubuntu 14.04 LTS 3.19.0-68.76~14.04.1
- linux-lts-xenial Ubuntu 14.04 LTS 4.4.0-36.55~14.04.1
- linux-snapdragon Ubuntu 16.04 LTS 4.4.0-1024.27
ubuntu advisories UBUNTU-CVE-2016-5696
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel RHEL 7 3.10.0-327.28.3.el7
- perf RHEL 7 3.10.0-327.28.3.el7
- python-perf RHEL 7 3.10.0-327.28.3.el7
- kernel-kdump RHEL 7 3.10.0-327.28.3.el7
- kernel-tools RHEL 7 3.10.0-327.28.3.el7
- kernel-tools-libs RHEL 7 3.10.0-327.28.3.el7
- kernel-bootwrapper RHEL 7 3.10.0-327.28.3.el7
- kernel-abi-whitelists RHEL 7 3.10.0-327.28.3.el7
red hat advisories RHSA-2016:1633RHSA-2016:1815RHSA-2016:1814RHSA-2016:1939RHSA-2016:1664RHSA-2016:1657
- kernel-rt SLE Real Time 11 SP4 3.0.101.rt130-68.1
- kernel-syms-rt SLE Real Time 11 SP4 3.0.101.rt130-68.1
- kernel-rt_trace SLE Real Time 11 SP4 3.0.101.rt130-68.1
- kernel-source-rt SLE Real Time 11 SP4 3.0.101.rt130-68.1
- kernel-ec2 SLE Module for Public Cloud 12 3.12.61-52.66.1
- kernel-ec2 SLES for SAP 11 SP4, SLES 11 SP4 3.0.101-94.1
- kernel-pae SLES for SAP 11 SP4, SLES 11 SP4 3.0.101-94.1
- kernel-xen SLES for SAP 11 SP4, SLES 11 SP4 3.0.101-94.1
suse advisories SUSE-SU-2017:1102-1SUSE-SU-2017:0471-1SUSE-SU-2017:0437-1SUSE-SU-2016:3304-1SUSE-SU-2016:3069-1SUSE-SU-2016:2976-1
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2016-5696 updated cvss 4.8
kernel: challenge ACK counter information disclosure.
-
Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-327.28.3.el7, kernel 3.10.0-327.28.3.el7, python-perf 3.10.0-327.28.3.el7, kernel-tools 3.10.0-327.28.3.el7, kernel-tools-libs 3.10.0-327.28.3.el7, kernel-abi-whitelists 3.10.0-327.28.3.el7, +1 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-327.28.3.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-327.28.3.el7, kernel 3.10.0-327.28.3.el7, python-perf 3.10.0-327.28.3.el7, kernel-tools 3.10.0-327.28.3.el7, kernel-tools-libs 3.10.0-327.28.3.el7, kernel-abi-whitelists 3.10.0-327.28.3.el7, +1 morefixed: vendor fix RHSA-2016:1633
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Red Hat Enterprise Linux ComputeNode EUS (v. 7.1) perf 3.10.0-229.40.1.el7, kernel 3.10.0-229.40.1.el7, kernel-tools 3.10.0-229.40.1.el7, kernel-tools-libs 3.10.0-229.40.1.el7, kernel-abi-whitelists 3.10.0-229.40.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.40.1.el7fixed: vendor fix RHSA-2016:1657
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Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-327.28.3.el7fixed: vendor fix RHSA-2016:1633
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Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.1) python-perf 3.10.0-229.40.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.40.1.el7fixed: vendor fix RHSA-2016:1657
-
Red Hat Enterprise Linux Desktop (v. 6) perf 2.6.32-642.4.2.el6, kernel 2.6.32-642.4.2.el6, kernel-firmware 2.6.32-642.4.2.el6, kernel-abi-whitelists 2.6.32-642.4.2.el6, kernel-debuginfo-common-i686 2.6.32-642.4.2.el6, kernel-debuginfo-common-x86_64 2.6.32-642.4.2.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) python-perf 2.6.32-642.4.2.el6, kernel-debuginfo-common-i686 2.6.32-642.4.2.el6, kernel-debuginfo-common-x86_64 2.6.32-642.4.2.el6fixed: vendor fix RHSA-2016:1664
-
Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-327.28.3.rt56.235.el7, kernel-rt-kvm 3.10.0-327.28.3.rt56.235.el7, kernel-rt-trace 3.10.0-327.28.3.rt56.235.el7, kernel-rt-debug-kvm 3.10.0-327.28.3.rt56.235.el7, kernel-rt-trace-kvm 3.10.0-327.28.3.rt56.235.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-327.28.3.rt56.235.el7fixed: vendor fix RHSA-2016:1632
-
Red Hat Enterprise Linux HPC Node (v. 6) perf 2.6.32-642.4.2.el6, kernel 2.6.32-642.4.2.el6, kernel-firmware 2.6.32-642.4.2.el6, kernel-abi-whitelists 2.6.32-642.4.2.el6, kernel-debuginfo-common-i686 2.6.32-642.4.2.el6, kernel-debuginfo-common-x86_64 2.6.32-642.4.2.el6fixed: vendor fix RHSA-2016:1664
-
Red Hat Enterprise Linux HPC Node EUS (v. 6.6) perf 2.6.32-504.52.1.el6, kernel 2.6.32-504.52.1.el6, kernel-firmware 2.6.32-504.52.1.el6, kernel-abi-whitelists 2.6.32-504.52.1.el6, kernel-debuginfo-common-i686 2.6.32-504.52.1.el6, kernel-debuginfo-common-x86_64 2.6.32-504.52.1.el6fixed: vendor fix RHSA-2016:1939
show 23 moreshow fewer
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Red Hat Enterprise Linux HPC Node EUS (v. 6.7) perf 2.6.32-573.34.1.el6, kernel 2.6.32-573.34.1.el6, kernel-firmware 2.6.32-573.34.1.el6, kernel-abi-whitelists 2.6.32-573.34.1.el6, kernel-debuginfo-common-i686 2.6.32-573.34.1.el6, kernel-debuginfo-common-x86_64 2.6.32-573.34.1.el6fixed: vendor fix RHSA-2016:1815
-
Red Hat Enterprise Linux HPC Node Optional (v. 6) python-perf 2.6.32-642.4.2.el6, kernel-debuginfo-common-x86_64 2.6.32-642.4.2.el6fixed: vendor fix RHSA-2016:1664
-
Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.6) python-perf 2.6.32-504.52.1.el6, kernel-debuginfo-common-x86_64 2.6.32-504.52.1.el6fixed: vendor fix RHSA-2016:1939
-
Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7) python-perf 2.6.32-573.34.1.el6, kernel-debuginfo-common-x86_64 2.6.32-573.34.1.el6fixed: vendor fix RHSA-2016:1815
-
Red Hat Enterprise Linux Realtime (v. 7) kernel-rt 3.10.0-327.28.3.rt56.235.el7, kernel-rt-trace 3.10.0-327.28.3.rt56.235.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-327.28.3.rt56.235.el7fixed: vendor fix RHSA-2016:1632
-
Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-642.4.2.el6, kernel 2.6.32-642.4.2.el6, kernel-kdump 2.6.32-642.4.2.el6, kernel-firmware 2.6.32-642.4.2.el6, kernel-bootwrapper 2.6.32-642.4.2.el6, kernel-abi-whitelists 2.6.32-642.4.2.el6, +4 morefixed: vendor fix RHSA-2016:1664
-
Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-327.28.3.el7, kernel 3.10.0-327.28.3.el7, python-perf 3.10.0-327.28.3.el7, kernel-kdump 3.10.0-327.28.3.el7, kernel-tools 3.10.0-327.28.3.el7, kernel-tools-libs 3.10.0-327.28.3.el7, +6 morefixed: vendor fix RHSA-2016:1633
-
Red Hat Enterprise Linux Server AUS (v. 6.5) perf 2.6.32-431.73.2.el6, kernel 2.6.32-431.73.2.el6, kernel-firmware 2.6.32-431.73.2.el6, kernel-abi-whitelists 2.6.32-431.73.2.el6, kernel-debuginfo-common-x86_64 2.6.32-431.73.2.el6fixed: vendor fix RHSA-2016:1814
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Red Hat Enterprise Linux Server EUS (v. 6.6) perf 2.6.32-504.52.1.el6, kernel 2.6.32-504.52.1.el6, kernel-kdump 2.6.32-504.52.1.el6, kernel-firmware 2.6.32-504.52.1.el6, kernel-bootwrapper 2.6.32-504.52.1.el6, kernel-abi-whitelists 2.6.32-504.52.1.el6, +4 morefixed: vendor fix RHSA-2016:1939
-
Red Hat Enterprise Linux Server EUS (v. 6.7) perf 2.6.32-573.34.1.el6, kernel 2.6.32-573.34.1.el6, kernel-kdump 2.6.32-573.34.1.el6, kernel-firmware 2.6.32-573.34.1.el6, kernel-bootwrapper 2.6.32-573.34.1.el6, kernel-abi-whitelists 2.6.32-573.34.1.el6, +4 morefixed: vendor fix RHSA-2016:1815
-
Red Hat Enterprise Linux Server EUS (v. 7.1) perf 3.10.0-229.40.1.el7, kernel 3.10.0-229.40.1.el7, perf 3.10.0-229.40.1.ael7b, kernel 3.10.0-229.40.1.ael7b, kernel-kdump 3.10.0-229.40.1.el7, kernel-tools 3.10.0-229.40.1.el7, +11 morefixed: vendor fix RHSA-2016:1657
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Red Hat Enterprise Linux Server Optional (v. 6) python-perf 2.6.32-642.4.2.el6, kernel-debuginfo-common-i686 2.6.32-642.4.2.el6, kernel-debuginfo-common-ppc64 2.6.32-642.4.2.el6, kernel-debuginfo-common-s390x 2.6.32-642.4.2.el6, kernel-debuginfo-common-x86_64 2.6.32-642.4.2.el6fixed: vendor fix RHSA-2016:1664
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Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-327.28.3.el7, kernel-debuginfo-common-x86_64 3.10.0-327.28.3.el7, kernel-debuginfo-common-ppc64le 3.10.0-327.28.3.el7fixed: vendor fix RHSA-2016:1633
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Red Hat Enterprise Linux Server Optional AUS (v. 6.5) kernel 2.6.32-431.73.2.el6, python-perf 2.6.32-431.73.2.el6, kernel-debuginfo-common-x86_64 2.6.32-431.73.2.el6fixed: vendor fix RHSA-2016:1814
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Red Hat Enterprise Linux Server Optional EUS (v. 6.6) python-perf 2.6.32-504.52.1.el6, kernel-debuginfo-common-i686 2.6.32-504.52.1.el6, kernel-debuginfo-common-ppc64 2.6.32-504.52.1.el6, kernel-debuginfo-common-s390x 2.6.32-504.52.1.el6, kernel-debuginfo-common-x86_64 2.6.32-504.52.1.el6fixed: vendor fix RHSA-2016:1939
-
Red Hat Enterprise Linux Server Optional EUS (v. 6.7) python-perf 2.6.32-573.34.1.el6, kernel-debuginfo-common-i686 2.6.32-573.34.1.el6, kernel-debuginfo-common-ppc64 2.6.32-573.34.1.el6, kernel-debuginfo-common-s390x 2.6.32-573.34.1.el6, kernel-debuginfo-common-x86_64 2.6.32-573.34.1.el6fixed: vendor fix RHSA-2016:1815
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Red Hat Enterprise Linux Server Optional EUS (v. 7.1) python-perf 3.10.0-229.40.1.el7, python-perf 3.10.0-229.40.1.ael7b, kernel-debuginfo-common-ppc64 3.10.0-229.40.1.el7, kernel-debuginfo-common-s390x 3.10.0-229.40.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.40.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-229.40.1.ael7bfixed: vendor fix RHSA-2016:1657
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Red Hat Enterprise Linux Workstation (v. 6) perf 2.6.32-642.4.2.el6, kernel 2.6.32-642.4.2.el6, kernel-firmware 2.6.32-642.4.2.el6, kernel-abi-whitelists 2.6.32-642.4.2.el6, kernel-debuginfo-common-i686 2.6.32-642.4.2.el6, kernel-debuginfo-common-x86_64 2.6.32-642.4.2.el6fixed: vendor fix RHSA-2016:1664
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Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-327.28.3.el7, kernel 3.10.0-327.28.3.el7, python-perf 3.10.0-327.28.3.el7, kernel-tools 3.10.0-327.28.3.el7, kernel-tools-libs 3.10.0-327.28.3.el7, kernel-abi-whitelists 3.10.0-327.28.3.el7, +1 morefixed: vendor fix RHSA-2016:1633
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Red Hat Enterprise Linux Workstation Optional (v. 6) python-perf 2.6.32-642.4.2.el6, kernel-debuginfo-common-i686 2.6.32-642.4.2.el6, kernel-debuginfo-common-x86_64 2.6.32-642.4.2.el6fixed: vendor fix RHSA-2016:1664
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Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-327.28.3.el7fixed: vendor fix RHSA-2016:1633
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Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 3.10.0-327.rt56.195.el6rt, kernel-rt-trace 3.10.0-327.rt56.195.el6rt, kernel-rt-vanilla 3.10.0-327.rt56.195.el6rt, kernel-rt-firmware 3.10.0-327.rt56.195.el6rt, kernel-rt-debuginfo-common-x86_64 3.10.0-327.rt56.195.el6rtfixed: vendor fix RHSA-2016:1631
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Red Hat Enterprise Linux 4 kernel Red Hat Enterprise Linux 5 kernelnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
14.51% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- github.com https://github.com/Gnoxter/mountain_goat referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 4.8 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:N/I:P/A:P |
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
- Technology feeds
References
-
github.com
/torvalds/linux/commit/75ff39ccc1bd5d3c455b6822ab09e533c551f758
issue-tracking, patch
-
git.kernel.org
/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758
issue-tracking, patch
-
github.com
/Gnoxter/mountain_goat
exploit, third-party-advisory
-
ubuntu.com
/usn/USN-3070-1
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2016-1657.html
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2016-1814.html
vendor-advisory
-
ubuntu.com
/usn/USN-3070-3
vendor-advisory
-
ubuntu.com
/usn/USN-3070-2
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2016-1815.html
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2016-1939.html
vendor-advisory
-
ubuntu.com
/usn/USN-3071-1
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2016-1632.html
vendor-advisory
-
ubuntu.com
/usn/USN-3070-4
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2016-1631.html
vendor-advisory
-
ubuntu.com
/usn/USN-3072-2
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2016-1633.html
vendor-advisory
-
rhn.redhat.com
/errata/RHSA-2016-1664.html
vendor-advisory
-
ubuntu.com
/usn/USN-3072-1
vendor-advisory
-
ubuntu.com
/usn/USN-3071-2
vendor-advisory
-
oracle.com
/technetwork/topics/security/ovmbulletinjul2016-3090546.html
vendor-advisory
- bto.bluecoat.com /security-advisory/sa131
-
oracle.com
/technetwork/topics/security/linuxbulletinjul2016-3090544.html
third-party-advisory
- kc.mcafee.com /corporate/index?page=content&id=SB10167
-
source.android.com
/security/bulletin/2016-10-01.html
third-party-advisory
-
securityfocus.com
/bid/91704
vdb-entry
-
usenix.org
/system/files/conference/usenixsecurity16/sec16_paper_cao.pdf
technical-description
-
securitytracker.com
/id/1036625
vdb-entry
-
bugzilla.redhat.com
/show_bug.cgi?id=1354708
issue-tracking
-
prnewswire.com
/news-releases/mitnick-attack-reappears-at-geekpwn-macau-contest-300270779.html
technical-description
-
openwall.com
/lists/oss-security/2016/07/12/2
mailing-list, third-party-advisory
- security.paloaltonetworks.com /CVE-2016-5696
- arista.com /en/support/advisories-notices/security-advisories/1461-security-advisory-23
Sources
- CVE List CVE-2016-5696
- NVD CVE-2016-5696
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.