Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

CVE-2016-6828

Published: 18 August 2016

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.

From the Ubuntu Security Team

Marco Grassi discovered a use-after-free condition could occur in the TCP retransmit queue handling code in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Notes

AuthorNote
jdstrand
android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
precise
Released (3.2.0-111.153)
trusty
Released (3.13.0-98.145)
xenial
Released (4.4.0-42.62)
yakkety Not vulnerable
(4.8.0-11.12)
zesty Not vulnerable
(4.8.0-22.24)
upstream
Released (4.8~rc5)
Patches:
Introduced by

6859d49475d4f32abe640372117e4b687906e6b6

Fixed by bb1fceca22492109be12640d49f5ea5a544c6bb4
linux-armadaxp
Launchpad, Ubuntu, Debian
precise
Released (3.2.0-1674.100)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Not vulnerable
(4.4.0-1002.2)
xenial Not vulnerable
(4.4.0-1001.10)
yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-flo
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
xenial Ignored
(abandoned)
yakkety Ignored
(end of life)
zesty Does not exist

upstream
Released (4.8~rc5)
linux-gke
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Not vulnerable
(4.4.0-1003.3)
yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-goldfish
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
xenial Ignored
(abandoned)
yakkety Ignored
(end of life)
zesty Ignored
(end of life)
upstream
Released (4.8~rc5)
linux-grouper
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-hwe
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Not vulnerable
(4.8.0-36.36~16.04.1)
yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-hwe-edge
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial Not vulnerable
(4.8.0-36.36~16.04.1)
yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-linaro-omap
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-linaro-shared
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-lts-quantal
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-lts-saucy
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
precise
Released (3.13.0-98.145~precise1)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-lts-utopic
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-lts-vivid
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (3.19.0-71.79~14.04.1)
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-lts-wily
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-lts-xenial
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (4.4.0-42.62~14.04.1)
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-maguro
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-mako
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
xenial Ignored
(abandoned)
yakkety Ignored
(end of life)
zesty Does not exist

upstream
Released (4.8~rc5)
linux-manta
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-qcm-msm
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)
linux-raspi2
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial
Released (4.4.0-1027.33)
yakkety Not vulnerable
(4.8.0-1012.14)
zesty Not vulnerable
(4.8.0-1013.15)
upstream
Released (4.8~rc5)
linux-snapdragon
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

xenial
Released (4.4.0-1030.33)
yakkety Not vulnerable
(4.4.0-1029.32)
zesty Not vulnerable
(4.4.0-1029.32)
upstream
Released (4.8~rc5)
linux-ti-omap4
Launchpad, Ubuntu, Debian
precise
Released (3.2.0-1489.116)
trusty Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.8~rc5)

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H