CVE-2016-6828

MEDIUM

Linux Kernel < 4.7.4 - Use After Free

Title source: rule

Description

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.

Exploits (1)

exploitdb WORKING POC

by Marco Grassi · cdoslinux

https://www.exploit-db.com/exploits/40731

View Code ZIP pw:eip

References (12)

[Vendor Advisory] http://rhn.redhat.com/errata/RHSA-2017-0036.html

[Vendor Advisory] http://rhn.redhat.com/errata/RHSA-2017-0086.html

[Vendor Advisory] http://rhn.redhat.com/errata/RHSA-2017-0091.html

[Vendor Advisory] http://rhn.redhat.com/errata/RHSA-2017-0113.html

[Issue Tracking, Patch] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4

[Release Notes, Third Party Advisory] http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5

[Exploit, Third Party Advisory] http://www.openwall.com/lists/oss-security/2016/08/15/1

[Issue Tracking, Third Party Advisory] https://bugzilla.redhat.com/show_bug.cgi?id=1367091

[Issue Tracking, Patch] https://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4

[Various Sources] https://marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-uaf.html

[Vendor Advisory] https://source.android.com/security/bulletin/2016-11-01.html

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/92452

Scores

CVSS v3 5.5

EPSS 0.0010

EPSS Percentile 26.5%

Attack Vector LOCAL

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

Details

CWE

CWE-416

Status published

Products (1)

linux/linux_kernel < 4.7.4

Published Oct 16, 2016

Tracked Since Feb 18, 2026