Use After Free Affecting kernel-tools package, versions <0:3.10.0-514.6.1.el7
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-RHEL7-KERNELTOOLS-4687564
- published26 Jul 2021
- disclosed15 Aug 2016
Introduced: 15 Aug 2016
CVE-2016-6828 (opens in a new tab)How to fix?
Upgrade RHEL:7 kernel-tools to version 0:3.10.0-514.6.1.el7 or higher.
This issue was patched in RHSA-2017:0086.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools package and not the kernel-tools package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
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.
References
- http://www.securityfocus.com/bid/92452
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4
- https://bugzilla.redhat.com/show_bug.cgi?id=1367091
- https://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4
- https://source.android.com/security/bulletin/2016-11-01.html
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5
- https://access.redhat.com/security/cve/CVE-2016-6828
- https://marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-uaf.html
- http://www.openwall.com/lists/oss-security/2016/08/15/1
- 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
- https://access.redhat.com/errata/RHSA-2017:0086
- https://www.exploit-db.com/exploits/40731