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
02 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
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 1.18% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 67.4% of scored records. A rank, not a probability.
- NVD base score
- 5.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2016-10-16 21:00Z10 YR AGO
- Last updated
- 2024-08-06 01:43Z2 YR AGO
- Reserved
- 2016-08-17
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-416Use After FreeVariant
- Data version
- 5.1
- Document digest
- d276135f266974208433410aeab7d348c37721e0f9b5c0cb8096aff3fbbc02e3
05 Affected products
06 References
- github.comhttps://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4
- rhn.redhat.comRHSA-2017:0086http://rhn.redhat.com/errata/RHSA-2017-0086.html
- rhn.redhat.comRHSA-2017:0113http://rhn.redhat.com/errata/RHSA-2017-0113.html
- rhn.redhat.comRHSA-2017:0091http://rhn.redhat.com/errata/RHSA-2017-0091.html
- www.openwall.com[oss-security] 20160815 Linux tcp_xmit_retransmit_queue use after free on 4.8-rc1 / masterhttp://www.openwall.com/lists/oss-security/2016/08/15/1
- www.securityfocus.com92452http://www.securityfocus.com/bid/92452
- source.android.comhttps://source.android.com/security/bulletin/2016-11-01.html
- rhn.redhat.comRHSA-2017:0036http://rhn.redhat.com/errata/RHSA-2017-0036.html
- marcograss.github.iohttps://marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-uaf.html
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1367091
- www.kernel.orghttp://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5
- git.kernel.orghttp://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4
07 Fixed in
Debian 12
- linux Fixed in 4.7.2-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 4.7.2-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 4.7.2-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- linux Fixed in 3.13.0-98.145
- linux-lts-vivid Fixed in 3.19.0-71.79~14.04.1
- linux-lts-xenial Fixed in 4.4.0-42.62~14.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- linux Fixed in 4.4.0-42.62
- linux-raspi2 Fixed in 4.4.0-1027.33
- linux-snapdragon Fixed in 4.4.0-1030.33
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.