What is CVE-2016-6828?

CVE-2016-6828 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Use After Free flaw (CWE-416). CVE-2016-6828 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2016-6828?

CVE-2016-6828 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2016-6828?

No patch is currently available for CVE-2016-6828. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2016-6828 actively exploited?

CVE-2016-6828 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2016-6828

Medium

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.

Package Linux Kernel

Published 2016-10-16

Last modified 2026-05-06

CVSS version 3.0

Patch available

Awaiting data

CVSS 3.0 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-416

CVE-2016-6828 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2016-6828 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Red Hat
http://rhn.redhat.com/errata/RHSA-2017-0036.html
Red Hat
http://rhn.redhat.com/errata/RHSA-2017-0086.html
Red Hat
http://rhn.redhat.com/errata/RHSA-2017-0091.html
Red Hat
http://rhn.redhat.com/errata/RHSA-2017-0113.html
Kernel.org
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5

Release Notes Third Party Advisory
Openwall
http://www.openwall.com/lists/oss-security/2016/08/15/1

Exploit Third Party Advisory
Securityfocus
http://www.securityfocus.com/bid/92452
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=1367091

Issue Tracking Third Party Advisory
Marcograss
https://marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-uaf.html
Source
https://source.android.com/security/bulletin/2016-11-01.html
Kernel patch commit
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4
Patch
Kernel patch commit
https://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4
Patch

Details

CVE ID CVE-2016-6828

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.0

Published 2016-10-16

Modified 2026-05-06

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2016-6828?

CVE-2016-6828 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Use After Free flaw (CWE-416) . CVE-2016-6828 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2016-6828?

CVE-2016-6828 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.0). The vector string is CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2016-6828?

No patch is currently available for CVE-2016-6828. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2016-6828 actively exploited?

No — CVE-2016-6828 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. View CWE-416 on MITRE CWE →