CVE-2016-6828

Linux Kernel - TCP Related Read Use-After-Free

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La función tcp_check_send_head en include/net/tcp.h en el kernel de Linux en versiones anteriores a 4.7.5 no mantiene adecuadamente cierto estado SACK tras una copia de datos fallida, lo que permite a usuarios locales provocar una denegación de servicio (uso después de liberación de memoria tcp_xmit_retransmit_queue y caída de sistema ) a través de una opción SACK manipulada.

A use-after-free vulnerability was found in tcp_xmit_retransmit_queue and other tcp_* functions. This condition could allow an attacker to send an incorrect selective acknowledgment to existing connections, possibly resetting a connection.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-08-17 CVE Reserved
2016-08-18 First Exploit
2016-09-06 CVE Published
2023-03-08 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-416: Use After Free

CAPEC

References (14)

URL	Tag	Source
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5	Release Notes
http://www.securityfocus.com/bid/92452	Vdb Entry
https://marcograss.github.io/security/linux/2016/08/18/cve-2016-6828-linux-kernel-tcp-uaf.html	X_refsource_misc
https://source.android.com/security/bulletin/2016-11-01.html	X_refsource_confirm

URL	Date	SRC
https://www.exploit-db.com/exploits/40731	2016-08-18
http://www.openwall.com/lists/oss-security/2016/08/15/1	2024-08-06

URL	Date	SRC
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bb1fceca22492109be12640d49f5ea5a544c6bb4	2023-02-12
https://github.com/torvalds/linux/commit/bb1fceca22492109be12640d49f5ea5a544c6bb4	2023-02-12

URL	Date	SRC
http://rhn.redhat.com/errata/RHSA-2017-0036.html	2023-02-12
http://rhn.redhat.com/errata/RHSA-2017-0086.html	2023-02-12
http://rhn.redhat.com/errata/RHSA-2017-0091.html	2023-02-12
http://rhn.redhat.com/errata/RHSA-2017-0113.html	2023-02-12
https://bugzilla.redhat.com/show_bug.cgi?id=1367091	2017-01-17
https://access.redhat.com/security/cve/CVE-2016-6828	2017-01-17

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				<= 4.7.4 Search vendor "Linux" for product "Linux Kernel" and version " <= 4.7.4"		-		Affected