CVE-2016-6828

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.

• CWE-416

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4Issue Tracking, Patch
• http://rhn.redhat.com/errata/RHSA-2017-0036.html
• http://rhn.redhat.com/errata/RHSA-2017-0086.html
• http://rhn.redhat.com/errata/RHSA-2017-0091.html
• http://rhn.redhat.com/errata/RHSA-2017-0113.html
• http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5Release Notes, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2016/08/15/1Exploit, Third Party Advisory
• http://www.securityfocus.com/bid/92452
• https://bugzilla.redhat.com/show_bug.cgi?id=1367091Issue Tracking, Third Party Advisory
• https://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4Issue Tracking, Patch
• https://marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-uaf.html
• https://source.android.com/security/bulletin/2016-11-01.html
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4Issue Tracking, Patch
• http://rhn.redhat.com/errata/RHSA-2017-0036.html
• http://rhn.redhat.com/errata/RHSA-2017-0086.html
• http://rhn.redhat.com/errata/RHSA-2017-0091.html
• http://rhn.redhat.com/errata/RHSA-2017-0113.html
• http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5Release Notes, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2016/08/15/1Exploit, Third Party Advisory
• http://www.securityfocus.com/bid/92452
• https://bugzilla.redhat.com/show_bug.cgi?id=1367091Issue Tracking, Third Party Advisory
• https://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4Issue Tracking, Patch
• https://marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-uaf.html
• https://source.android.com/security/bulletin/2016-11-01.html

Published

Oct 16, 2016

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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