CVE-2016-6828

MEDIUM

Linux Kernel < 4.7.4 - Use-After-Free in tcp_check_send_head

Title source: llm

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-6828. PoCs published by Marco Grassi.

AI-analyzed exploit summary This exploit targets a use-after-free vulnerability in the Linux kernel's TCP stack (CVE-2016-6828). It manipulates socket structures to achieve local privilege escalation by triggering a race condition during socket operations.

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.

Exploits (1)

exploitdb WORKING POC

by Marco Grassi · cdoslinux

https://www.exploit-db.com/exploits/40731

View Code ZIP pw:eip

This exploit targets a use-after-free vulnerability in the Linux kernel's TCP stack (CVE-2016-6828). It manipulates socket structures to achieve local privilege escalation by triggering a race condition during socket operations.

Classification

Working Poc 95%

Attack Type

Lpe

Complexity

Complex

Reliability

Racy

Target: Linux Kernel < 4.7.5

No auth needed

Prerequisites: Local access to the target system · Kernel version vulnerable to CVE-2016-6828

MITRE ATT&CK

T1068 - Exploitation for Privilege Escalation

devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (12)

Core 12

Core References

Issue Tracking, Patch x_refsource_confirm

https://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4

View Patch ZIP pw:eip

Vendor Advisory vendor-advisory x_refsource_redhat

http://rhn.redhat.com/errata/RHSA-2017-0086.html

Vendor Advisory vendor-advisory x_refsource_redhat

http://rhn.redhat.com/errata/RHSA-2017-0113.html

Vendor Advisory vendor-advisory x_refsource_redhat

http://rhn.redhat.com/errata/RHSA-2017-0091.html

Exploit, Third Party Advisory mailing-list x_refsource_mlist

http://www.openwall.com/lists/oss-security/2016/08/15/1

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/92452

Vendor Advisory x_refsource_confirm

https://source.android.com/security/bulletin/2016-11-01.html

Vendor Advisory vendor-advisory x_refsource_redhat

http://rhn.redhat.com/errata/RHSA-2017-0036.html

Various Sources x_refsource_misc

https://marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-uaf.html

Issue Tracking, Third Party Advisory x_refsource_confirm

https://bugzilla.redhat.com/show_bug.cgi?id=1367091

Release Notes, Third Party Advisory x_refsource_confirm

http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5

Issue Tracking, Patch x_refsource_confirm

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4

Scores

CVSS v3 5.5

EPSS 0.0010

EPSS Percentile 26.8%

Attack Vector LOCAL

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE

CWE-416

Status published

Products (1)

linux/linux_kernel < 4.7.4

Published Oct 16, 2016

Tracked Since Feb 18, 2026