Use After Free Affecting kernel package, versions <0:4.4.19-29.55.amzn1
Threat Intelligence
Snyk has a published code exploit for 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.
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Test your applications- Snyk IDSNYK-AMZN201803-KERNEL-1701719
- published27 Sept 2021
- disclosed16 Oct 2016
Introduced: 16 Oct 2016
CVE-2016-6828 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2018.03 kernel to version 0:4.4.19-29.55.amzn1 or higher.
This issue was patched in ALAS-2016-740.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2018.03 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
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=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-2017:0036
- https://access.redhat.com/errata/RHSA-2017:0086
- https://access.redhat.com/errata/RHSA-2017:0091
- https://access.redhat.com/errata/RHSA-2017:0113
- https://access.redhat.com/security/cve/CVE-2016-6828
- https://www.exploit-db.com/exploits/40731