Vulnerability CVE-2016-6828
Published: 2016-10-16

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.

Type:

CWE-416

 (Use After Free)

CVSS2 => (AV:L/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
6.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Linux -> Linux kernel 

 References:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4
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-4.7.5
http://www.openwall.com/lists/oss-security/2016/08/15/1
http://www.securityfocus.com/bid/92452
https://bugzilla.redhat.com/show_bug.cgi?id=1367091
https://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4
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
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