CVE-2016-6828

mediumpriority · track · 32EPSS 0.012 · 68 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

1.18% (68th) EPSS

CVSS 4.9 · medium

Is it mine?

32 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · redhat_csaf

EPSS · scored 2026-10-28

The tcp_check_send_head function in include/net/tcp.h in the Linux kernel before 4.7.5 does not properly maintain certain SACK state after a failed data copy, which allows local users to cause a denial of service (tcp_xmit_retransmit_queue use-after-free and system crash) via a crafted SACK option.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedkernel-rt-0:3.10.0-514.6.1.rt56.429.el7.src as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-0:3.10.0-514.6.1.rt56.429.el7.src as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debug-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debug-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debug-debuginfo-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debug-debuginfo-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debug-devel-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debug-devel-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debug-kvm-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debug-kvm-debuginfo-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debuginfo-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debuginfo-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debuginfo-common-x86_64-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-debuginfo-common-x86_64-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-devel-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-devel-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-doc-0:3.10.0-514.6.1.rt56.429.el7.noarch as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-doc-0:3.10.0-514.6.1.rt56.429.el7.noarch as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-kvm-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-kvm-debuginfo-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-trace-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-trace-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-trace-debuginfo-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-trace-debuginfo-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-trace-devel-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux Realtime (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-trace-devel-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-trace-kvm-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091
Fixedkernel-rt-trace-kvm-debuginfo-0:3.10.0-514.6.1.rt56.429.el7.x86_64 as a component of Red Hat Enterprise Linux for Real Time for NFV (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2017:0091

cvss

Technical severity, 0–10. One row per scoring source.

5.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.6–5.5

v2.04.9mediumAV:L/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 3.9 · impact 6.9

v3.05.5mediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 3.6

v2.03.6lowAV:L/AC:L/Au:N/C:N/I:P/A:Psecondary · Red Hat Product Security US

v3.05.2mediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:Psecondary · CVSS-BT (t0sche)

v3.04.4mediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Lsecondary · Red Hat Product Security US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-416USprimaryCWE-416US

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-40731Linux Kernel - TCP Related Read Use-After-FreePoC · exploit_db

affected products (32)

Products and version ranges known to be affected.

showing 20 of 32

advisories (1)

Vendor and ecosystem advisories describing this.

RHSA-2017:0091Red Hat Security Advisory: kernel-rt security and bug fix update2017-01-17csaf · redhat_csafUS
An update for kernel-rt is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd redhat_csaf NVD CVE.org MITRE

published 2016-10-16modified 2026-06-17

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references (44)

External citations — patches, advisories, analysis.

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