Use After Free in Linux Kernel
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.012 (66.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4 (Patch, Issue Tracking)
- rhn.redhat.com/errata/RHSA-2017-0086.html (vendor-advisory)
- rhn.redhat.com/errata/RHSA-2017-0113.html (vendor-advisory)
- rhn.redhat.com/errata/RHSA-2017-0091.html (vendor-advisory)
- www.openwall.com/lists/oss-security/2016/08/15/1 (mailing-list, Exploit, Third Party Advisory)
- www.securityfocus.com/bid/92452 (vdb-entry)
- source.android.com/security/bulletin/2016-11-01.html
- rhn.redhat.com/errata/RHSA-2017-0036.html (vendor-advisory)
- marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-u…
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2016-6828?
- CVE-2016-6828 is a medium-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 5.5/10. Published 2016-10-16.
- How severe is CVE-2016-6828?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2016-6828 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.