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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 14.5%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
Description
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.
- CVSS 3.0
- 4.8 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
- EPSS
- 14.51% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- google/android · oracle/vm server · linux/linux kernel
- Source
- cve@mitre.org
EPSS 14.5% since 4 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758Issue Tracking, Patch
- 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.htmlThird Party Advisory
- http://www.openwall.com/lists/oss-security/2016/07/12/2Mailing List, Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.htmlThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.htmlVendor Advisory
- http://www.prnewswire.com/news-releases/mitnick-attack-reappears-at-geekpwn-macau-contest-300270779.htmlTechnical Description
- 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=1354708Issue Tracking
- https://github.com/Gnoxter/mountain_goatExploit, Third Party Advisory
- https://github.com/torvalds/linux/commit/75ff39ccc1bd5d3c455b6822ab09e533c551f758Issue Tracking, Patch
- https://kc.mcafee.com/corporate/index?page=content&id=SB10167
- https://security.paloaltonetworks.com/CVE-2016-5696
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.