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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…
Medium5.5EPSS 1.2%
- Published
- Updated
- Reserved
- Assigned by
- redhat
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.
Timeline
ID reserved
By redhat
- 2 months later
· 2 months later
Published
- 8 years later
· 8 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium5.5 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 1.2% · top 32% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
n/a
- affected n/a
References (12)
- https://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4 (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2017:0086 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2017:0113 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2017:0091 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- [oss-security] 20160815 Linux tcp_xmit_retransmit_queue use after free on 4.8-rc1 / master (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 92452 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://source.android.com/security/bulletin/2016-11-01.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2017:0036 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-uaf.html (opens in a new tab)x_refsource_MISCx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=1367091 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4 (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2016-6828)Record last updated .