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CVE-2016-4470

Published: 27 June 2016

The key_reject_and_link function in security/keys/key.c in the Linux kernel through 4.6.3 does not ensure that a certain data structure is initialized, which allows local users to cause a denial of service (system crash) via vectors involving a crafted keyctl request2 command.

From the Ubuntu Security Team

It was discovered that the keyring implementation in the Linux kernel did not ensure a data structure was initialized before referencing it after an error condition occurred. A local attacker could use this to cause a denial of service (system crash).

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-armadaxp
Launchpad, Ubuntu, Debian
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
precise
Released (3.2.0-1670.96)
trusty Does not exist

wily Does not exist

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 (4.7~rc4)
linux-flo
Launchpad, Ubuntu, Debian
precise Does not exist

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

upstream
Released (4.7~rc4)
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 (4.7~rc4)
linux-goldfish
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
wily Ignored
(end of life)
xenial Ignored
(abandoned)
yakkety Ignored
(end of life)
zesty Ignored
(end of life)
upstream
Released (4.7~rc4)
linux-grouper
Launchpad, Ubuntu, Debian
precise Does not exist

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

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
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 (4.7~rc4)
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 (4.7~rc4)
linux-lts-quantal
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
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

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
linux-lts-saucy
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
precise
Released (3.13.0-93.140~precise1)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
linux-lts-utopic
Launchpad, Ubuntu, Debian
precise Does not exist

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

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
linux-lts-vivid
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (3.19.0-66.74~14.04.1)
wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
linux-lts-wily
Launchpad, Ubuntu, Debian
precise Does not exist

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

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
linux-lts-xenial
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (4.4.0-34.53~14.04.1)
wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
linux-maguro
Launchpad, Ubuntu, Debian
precise Does not exist

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

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
linux-mako
Launchpad, Ubuntu, Debian
precise Does not exist

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

upstream
Released (4.7~rc4)
linux-manta
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
wily Ignored
(end of life)
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream
Released (4.7~rc4)
linux-raspi2
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

wily Ignored
(end of life)
xenial
Released (4.4.0-1019.25)
yakkety Not vulnerable
(4.8.0-1012.14)
zesty Not vulnerable
(4.8.0-1013.15)
upstream
Released (4.7~rc4)
linux-snapdragon
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

wily Does not exist

xenial
Released (4.4.0-1022.25)
yakkety Not vulnerable
(4.4.0-1022.25)
zesty Not vulnerable
(4.4.0-1029.32)
upstream
Released (4.7~rc4)
linux
Launchpad, Ubuntu, Debian
upstream
Released (4.7~rc4)
precise
Released (3.2.0-107.148)
trusty
Released (3.13.0-93.140)
wily Ignored
(end of life)
xenial
Released (4.4.0-34.53)
yakkety Not vulnerable
(4.4.0-33.52)
zesty Not vulnerable
(4.8.0-22.24)
Patches:
Introduced by

f70e2e06196ad4c1c762037da2f75354f6c16b81

Fixed by 38327424b40bcebe2de92d07312c89360ac9229a
linux-linaro-omap
Launchpad, Ubuntu, Debian
upstream
Released (4.7~rc4)
precise Ignored
(end of life)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-linaro-shared
Launchpad, Ubuntu, Debian
upstream
Released (4.7~rc4)
precise Ignored
(end of life)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-ti-omap4
Launchpad, Ubuntu, Debian
upstream
Released (4.7~rc4)
precise
Released (3.2.0-1485.112)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-linaro-vexpress
Launchpad, Ubuntu, Debian
upstream
Released (4.7~rc4)
precise Ignored
(end of life)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-qcm-msm
Launchpad, Ubuntu, Debian
upstream
Released (4.7~rc4)
precise Ignored
(end of life)
trusty Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

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